Condition Analysis
AI-powered assessment using site data and 14-day weather history
Great Wanney has not had an adequate drying window: 14.1mm fell on May 3rd, followed by further light rain on May 5th and today (May 7th), with only isolated dry days in between at moderate temperatures and high humidity. The forecast brings more rain tomorrow and heavy rain on May 9th, meaning conditions are unlikely to improve this week.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The 14.1mm event on May 3rd at 97% humidity would have deeply saturated the porous Fell Sandstone, and subsequent dry spells have been too short and cool (avg 7.2°C over 7 days) to fully dry the rock internally.
- Great Wanney's S/SW aspect and exposed moorland position aid drying, but recent winds have been from E/NE/N — not directly onto the face — reducing the benefit of the crag's exposed setting.
- The approach track across open moorland is notoriously boggy; if the ground at the crag base is still damp, the rock almost certainly retains internal moisture.
- April was persistently wet (42.2mm over 28 days with rain on most weeks), meaning background moisture levels in the sandstone are elevated even before the May 3rd soaking.
Warnings
2
- Fell Sandstone loses up to 50% of its compressive strength when wet — climbing on damp rock risks hold breakage, serious injury, and permanent route damage.
- Overnight temperatures have dipped below 0°C several times recently; any residual moisture in the rock may have undergone freeze-thaw cycling, further weakening the surface.
Reasoning
The 14.1mm rainfall on May 3rd at near-saturation humidity (97%) will have driven moisture deep into the porous Fell Sandstone, and only ~3.5 dry days have elapsed since, with further light precipitation on May 5th and today reducing net drying.
Despite the S/SW aspect, recent winds have been predominantly from the E/NE/N (not favourable for drying the face), temperatures have averaged only 7.2°C, and humidity has remained around 80% — all factors that slow evaporation significantly.
With probable internal saturation still above the critical threshold, climbing risks hold breakage on the iron-oxide-cemented features that define Great Wanney's routes, causing irreversible damage.
Early May at 280m altitude brings cool overnight temperatures (some nights near or below 0°C), which slow drying and introduce residual freeze-thaw risk on any moisture retained in the rock.
Contributing Factors
7
14.1mm at 97% humidity deeply saturated the sandstone only 4 days ago, requiring at minimum 48–72+ hours of good drying conditions that have not materialised.
Only ~1.5 genuinely dry days (May 4th and 6th) have occurred since the heavy rain, with further light rain on May 5th and today interrupting the drying process.
The 7-day average temperature of 7.2°C and 80% humidity significantly slow evaporation from the porous rock.
Winds have been predominantly E/NE/N recently, which do not blow directly onto the S/SW-facing crag and thus provide less drying benefit than the crag's exposed position would normally offer.
The south/south-west aspect and exposed moorland setting give the crag above-average solar radiation and airflow when conditions align.
42.2mm over the past 28 days with rain on most weeks means background moisture levels in the sandstone are elevated, extending required drying times.
Today's forecast shows 0.8mm of drizzle through the afternoon/evening, and tomorrow brings a further 2.5mm, resetting any drying progress.
Recommendations
3
- Do not climb at Great Wanney today or in the coming days — the rock is very likely still damp internally from the May 3rd soaking and ongoing light rain.
- Monitor conditions after May 10th; a meaningful dry spell of at least 2–3 consecutive dry, breezy days with southerly winds would be needed before considering a visit.
- If you do walk in to check conditions, test by feeling the ground at the crag base — if it is damp or muddy rather than sandy-dry, the rock is not ready.
Previous Analyses
Marginal — Assess Conditions
60%
2 days ago
The last significant rain was 14.1mm on May 3rd, followed by a dry day, then 1.4mm on May 5th — giving only one full dry day (today) since the last moisture. The S/SW aspect and exposed setting help drying, and today's low humidity (mid-40s) and moderate wind are favourable, but the heavy recent rain and cool temperatures mean internal moisture may linger. A careful on-site assessment is essential before committing to climb.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The 14.1mm event on May 3rd at 97% humidity would have deeply saturated the porous Fell Sandstone, and only ~2.5 dry days have elapsed since then — borderline for adequate drying of a heavy soaking.
- Great Wanney's exposed moorland setting at 280m means the walk-in is boggy after recent rain; if the ground at the crag base is still damp, the rock is almost certainly still wet internally.
- The S/SW aspect receives good spring solar radiation during the afternoon, which preferentially dries the main face, but any north-facing buttresses or recessed corners will hold moisture much longer.
- Overnight frost (down to -1.8°C today) after the recent saturation raises minor freeze-thaw concerns — repeated cycles on moisture-laden sandstone cause cumulative damage even when the surface looks dry.
Warnings
2
- Do not climb if any moisture is visible or the rock feels cool and clammy to the touch — Fell Sandstone loses significant strength at very low saturation levels.
- Heavy rain is forecast for May 9–10 (32.6mm combined), which will fully re-saturate the crag and require a further extended drying period.
Reasoning
The 14.1mm on May 3rd deeply saturated the rock, followed by only one fully dry day (May 4th), a further 1.4mm on May 5th, and today — meaning internal moisture levels are likely still elevated despite the surface potentially appearing dry.
The S/SW aspect and exposed position are favourable, and today's humidity dropping to the low 40s with moderate easterly wind provides decent drying, but approximately 2.5 days of mixed drying conditions after a heavy soaking is marginal for Fell Sandstone at 280m altitude.
With only ~2.5 days since 14.1mm of rain and average temperatures around 7°C, internal pore saturation may still be above the threshold where significant strength loss occurs, posing a risk of hold breakage on the iron-oxide features climbers rely on.
Early May at 280m altitude brings cool overnight temperatures (sub-zero last night) and moderate daytime warmth — spring drying is improving but not yet reliable, and the recent wet spell has kept the surrounding moorland saturated.
Contributing Factors
8
14.1mm at 97% humidity would have deeply saturated the porous sandstone, requiring 48–72+ hours of good drying conditions.
1.4mm on May 5th re-wetted the surface just as drying was underway, resetting the surface drying clock.
Just one completely dry day (today) since the last precipitation is below the two-day minimum rule of thumb for porous rock.
Afternoon humidity dropping to 43–45% with moderate wind provides genuinely good evaporative drying conditions for the S/SW-facing rock.
The south/south-west facing, wind-exposed crag benefits from strong spring solar radiation and good air movement, accelerating drying relative to sheltered or north-facing sites.
Average recent temperatures around 7°C at 280m slow evaporation compared to lowland or summer conditions.
Sub-zero overnight temperatures (-1.8°C last night) combined with residual internal moisture create minor freeze-thaw damage risk.
41.4mm over the last 28 days means the crag has had persistently elevated moisture levels throughout April, reducing the effectiveness of short dry spells.
Recommendations
3
- If visiting today, check the ground at the base of the crag — if it is damp or muddy rather than sandy-dry, do not climb as the rock is almost certainly still wet internally.
- Focus on the most exposed, south-facing upper sections of the crag if conditions look promising on arrival, and avoid any recessed, north-facing, or lower sections.
- Consider postponing until after the incoming wet spell clears — the forecast shows heavy rain May 9–10, so realistic next opportunity may not arise until mid-May at the earliest.
Do Not Climb
55%
3 days ago
Heavy rain on May 3rd (14.1mm) saturated the already moisture-laden Fell Sandstone only two days ago, and despite a dry day yesterday and today, the high humidity (81% average over the last week) and cool temperatures have not provided adequate drying conditions. The rock surface may appear dry but internal moisture is very likely still present.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Great Wanney's S/SW aspect and exposed moorland setting are helpful for drying, but the 14.1mm on May 3rd fell onto rock already primed by frequent light rain throughout mid-to-late April (40mm over 28 days), meaning internal saturation was already elevated before the heavy event.
- The walk-in across open moorland is notably boggy after wet periods — if the ground at the base of the crag is still moist, the rock is almost certainly still damp internally and should not be climbed.
- The escarpment's 10–20m height means lower sections will retain moisture significantly longer than upper faces; base-level routes and slabbier lines are highest risk.
- Overnight temperatures are dropping below freezing (-0.8°C tonight, -3.1°C tomorrow night) while the rock likely still holds internal moisture — this creates freeze-thaw conditions that can cause hidden structural damage at 280m altitude.
Warnings
2
- Do not climb today — only 48 hours since 14.1mm of rain onto already moisture-laden Fell Sandstone is insufficient drying time, regardless of surface appearance.
- Sub-zero temperatures tonight and tomorrow night (-0.8°C and -3.1°C) on potentially saturated rock create active freeze-thaw damage conditions — climbing during this period risks hold breakage and permanent route damage.
Reasoning
The 14.1mm on May 3rd fell onto sandstone that had received frequent small rain events throughout April (40mm in 28 days), meaning the rock was likely already carrying significant internal moisture before the heavy soaking — two days of drying is insufficient for this cumulative saturation.
Yesterday (May 4th) provided reasonable afternoon drying conditions with temps reaching 13°C, low-60s humidity, and moderate westerly wind, but today is cooler (max ~9°C) with higher humidity and a northerly wind that does not benefit the S/SW-facing aspect — net drying has been limited.
With 14.1mm rain only 48 hours ago on top of a persistently wet April, the rock likely retains enough internal moisture for significant strength reduction (potentially 30%+ compressive loss), and tonight's sub-zero temperatures introduce freeze-thaw risk at roughly 60%+ pore saturation.
Early May in Northumberland at 280m is marginal — overnight frosts are still occurring, and the prolonged wet April means the crag has had limited opportunity to fully dry out over the spring transition period.
Contributing Factors
8
14.1mm fell on May 3rd — well above the 10mm threshold requiring 48–72+ hours of good drying conditions, and we have had only ~36 hours of mixed drying.
40mm of precipitation over 28 days with frequent small rain events means the sandstone had elevated baseline moisture before the May 3rd soaking.
Average humidity of 81% over the last 7 days severely limits evaporative drying potential from the rock surface.
Average temperature of only 7.6°C over the past week, with today's max around 9°C, provides limited thermal energy for evaporation.
Great Wanney's south/south-west facing aspect and exposed moorland setting maximise available solar radiation and wind exposure for drying.
Temperatures forecast to drop to -0.8°C tonight and -3.1°C tomorrow night while rock likely still holds internal moisture above the critical 60% saturation threshold.
Moderate winds (15–22 km/h) today and yesterday help move moist air away from the rock surface, though today's northerly direction is less effective on the S/SW face.
The next 5 days are forecast essentially dry (only 0.3mm on May 8th), which will progressively improve conditions.
Recommendations
3
- Wait at least until May 7th or 8th before considering a visit — by then the rock will have had 4–5 days of mostly dry weather since the heavy rain, with improving temperatures.
- If you do visit later this week, check the ground at the crag base: if the moorland soil is still damp, the rock is almost certainly still wet internally and should not be climbed.
- Be aware of freeze-thaw damage potential from the sub-zero nights on May 5th and 6th — inspect holds carefully, especially on lower and less-travelled routes.
Do Not Climb
88%
4 days ago
Great Wanney received 14.1mm of heavy rain yesterday (May 3rd) in near-saturated conditions (97–99% humidity), and has had only one dry day since. The porous Fell Sandstone will be thoroughly saturated internally and requires at minimum 48–72 hours of good drying weather before climbing is appropriate.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Great Wanney's exposed moorland setting at 280m means the walk-in will be very boggy today — if the ground at the crag base is still wet, the rock is certainly still saturated internally.
- The S/SW aspect will receive some solar radiation this afternoon as humidity drops to ~48–53%, beginning the drying process, but this is insufficient to dry 14mm of rain absorbed into porous sandstone overnight.
- The escarpment's 10–20m height means lower sections will retain moisture longest as water drains downward through the rock; even if upper faces appear surface-dry, the base and mid-height routes will be wet.
- The preceding weeks have been persistently damp (40mm in 28 days, average humidity 82%) meaning background moisture levels in the rock were already elevated before yesterday's heavy rain.
Warnings
3
- Climbing on saturated Fell Sandstone today risks permanent and irreversible damage to routes — holds can snap off and the rock surface degrades.
- The surface may appear dry in afternoon sun while the interior remains dangerously weakened; do not be deceived by surface appearance.
- Overnight temperatures near freezing combined with saturated rock create freeze-thaw conditions that further weaken the sandstone.
Reasoning
The rock absorbed 14.1mm of rainfall yesterday in near-100% humidity over many hours, following weeks of intermittent rain (40mm in 28 days), meaning the sandstone is deeply saturated well beyond the surface.
Today is the first dry day with moderate westerly winds (15.5 km/h) and humidity dropping to ~48% by late afternoon, but the S/SW aspect and wind exposure provide only ~12 hours of useful drying from a heavily saturated state — far short of the 48–72 hours required after heavy rain.
At current saturation levels, Fell Sandstone will have lost 10–50% of its compressive strength; climbing today risks hold breakage, permanent route damage, and serious injury.
Spring conditions in early May at 280m altitude mean overnight temperatures are still dropping near or below freezing (min -0.6°C recently), and the prolonged damp spring has kept background moisture levels high throughout the sandstone.
Contributing Factors
7
14.1mm fell on May 3rd over many hours in near-saturated air (97% humidity), thoroughly wetting the porous sandstone.
Heavy rain on porous Fell Sandstone requires a minimum 48–72 hours of dry weather to reach safe climbing conditions, and only ~18 hours of drying have occurred.
40mm of rain over the past 28 days with average humidity of 82% means the rock's background moisture was already elevated before yesterday's downpour.
Humidity drops to ~48% with moderate westerly winds by mid-afternoon today, which will begin the drying process but is far from sufficient.
The south/south-west facing crag receives good solar radiation which aids drying, though one afternoon of sun cannot dry deeply saturated sandstone.
The exposed moorland setting allows wind to move moist air from the rock surface, accelerating evaporation compared to sheltered crags.
Overnight lows near or below freezing with saturated rock create freeze-thaw risk that could cause additional structural damage.
Recommendations
3
- Do not climb today — the rock is saturated from yesterday's heavy rain and needs at least 48–72 hours of dry weather to be safe.
- Monitor conditions through May 6th; if May 5th brings only light rain (1.7mm forecast) and May 6th is dry with low humidity (62%), an assess-on-arrival visit on May 7th may be possible.
- Use the ground-at-the-base test: if the soil and rock base are still visibly damp on arrival, the interior of the sandstone is certainly still wet and should not be climbed.
Do Not Climb
95%
4 days ago
Great Wanney received 14.3mm of heavy rain today with 95% humidity and an NE wind that shields the S/SW-facing crag from drying airflow. The rock will be thoroughly saturated and requires a minimum of 48–72 hours of dry, breezy weather before conditions could be considered safe.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The S/SW aspect is disadvantaged today because the NE wind blows onto the sheltered side of the crag, reducing surface evaporation despite the normally exposed setting.
- The approach across open moorland will be very boggy after 14.3mm of rain — if the ground at the crag base is sodden, the rock is certainly still saturated internally.
- The crag has had a persistently damp fortnight with 42.2mm over 28 days and average humidity of 83%, meaning the sandstone has had limited opportunity to dry out fully at depth.
- Upper tiers and any overhanging sections will dry first, but the majority of routes on this 10–20m escarpment will retain internal moisture for days given the recent saturation.
Warnings
3
- Climbing on saturated Fell Sandstone risks permanent destruction of irreplaceable iron oxide holds — NMC 'Love the rocks' ethic applies.
- The surface may appear dry before the interior has dried — do not rely on visual assessment alone after this volume of rain.
- Night-time temperatures are still dropping near or below freezing at 280m; any residual moisture in the rock creates freeze-thaw damage risk.
Reasoning
Today's 14.3mm at 95% humidity will have driven the wetting front deep into the porous Fell Sandstone, with the rock likely approaching 80–90% saturation given the lack of prior thorough drying.
The NE wind direction is unfavourable for this S/SW-facing crag, effectively sheltering the main face from drying airflow, and temperatures are only ~9°C — meaningful drying cannot begin until tomorrow at the earliest when the wind shifts to W.
With heavy saturation today on top of a damp preceding period, compressive strength will be reduced by 30%+ and iron oxide holds are at serious risk of breakage — climbing today or tomorrow would risk permanent route damage.
Spring conditions in early May at 280m altitude are marginal — nights are still dropping near or below freezing, and the prolonged damp winter/spring period means the rock may hold residual deep moisture beyond what recent rain alone would suggest.
Contributing Factors
6
14.3mm of rain today is classified as heavy for Fell Sandstone and will have thoroughly saturated the rock, requiring a minimum 48–72 hours of dry weather to recover.
Today's 95% humidity and the 7-day average of 83% severely inhibit evaporation, keeping the rock damp even when rain stops.
The NE wind today does not effectively ventilate the S/SW-facing crag, removing one of Great Wanney's usual drying advantages.
42.2mm over 28 days with persistently high humidity means the sandstone has had limited opportunity to dry at depth before today's heavy soaking.
Wind at 16.9 km/h is moderate but its NE direction negates much of the drying benefit for this south-facing crag.
Tomorrow is forecast dry with a shift to W wind and lower humidity (77%), which will begin the drying process on the S/SW face, though one day is insufficient after this volume of rain.
Recommendations
3
- Do not climb today — the rock is saturated from 14.3mm of rain and conditions are clearly unsafe for Fell Sandstone.
- Wait at least 48–72 hours of dry weather with favourable winds before considering a visit; realistically the earliest opportunity may be around May 7–8 if the forecast holds.
- On arrival, check the ground at the crag base: if the soil and peat are still damp or boggy, assume the rock retains internal moisture regardless of surface appearance.
Do Not Climb
95%
4 days ago
Great Wanney received 14.8mm of heavy rain today with 95% humidity — the rock is currently saturated and completely unsuitable for climbing. The preceding weeks have also been persistently damp with 42.7mm over 28 days, meaning the sandstone has had little opportunity to fully dry out before today's soaking.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Great Wanney's dramatic 10–20m escarpment means lower sections will retain moisture longest as water drains downward through the porous Fell Sandstone, and the base areas may remain damp for days after today's heavy rain.
- The 20–30 minute walk-in crosses boggy moorland which will be very wet after 14.8mm of rain — if the ground at the crag base is not sandy-dry, the rock interior is almost certainly still saturated.
- Despite the S/SW aspect and exposed position which normally aid drying, today's NE wind direction means the crag face is sheltered from the prevailing airflow, significantly reducing the drying benefit of wind exposure.
- Many routes here are noted as testing their grade with the VDiffs and Severes described as 'notably serious' — combining bold trad climbing with potentially weakened holds on wet sandstone creates an unacceptable risk.
Warnings
3
- Climbing on saturated Fell Sandstone risks permanent destruction of irreplaceable holds and routes — the NMC 'Love the Rocks' ethic applies absolutely today.
- Overnight frost forecast for May 6th (-1.3°C) could cause freeze-thaw damage if the rock is still saturated — this further argues for patience.
- The boggy moorland approach will be treacherous after today's heavy rain; take appropriate footwear and allow extra time.
Reasoning
The rock is currently saturated from 14.8mm of heavy rain today at 95% humidity, on top of a persistently damp period (16.7mm in the last 7 days, 42.7mm over 28 days) with no meaningful consecutive dry days.
Drying has not yet begun — rain fell today and the NE wind direction shelters the S/SW-facing crag; even once conditions improve tomorrow (SW wind, 77% humidity, 13.6°C), a minimum 48–72 hours of dry weather is needed after heavy rain on Fell Sandstone.
With the rock at or near full saturation, compressive strength will be reduced by 30%+ and iron oxide cemented holds are at serious risk of breakage — climbing now would risk permanent route damage.
Spring conditions in late April/early May at 280m are marginal, with overnight temperatures still dropping below freezing and the cumulative effect of a wet winter/spring meaning the rock has rarely been fully dry this season.
Contributing Factors
6
14.8mm of rain today is well above the heavy rain threshold, saturating the already-damp Fell Sandstone and requiring a minimum 48–72 hours of good drying conditions.
Today's 95% humidity and a 7-day average of 83% mean evaporation is severely suppressed, prolonging the time needed for the rock to dry.
With 42.7mm over 28 days and frequent small rain events, the sandstone has had little opportunity to fully dry internally this spring, meaning today's rain is wetting already partially-saturated rock.
Today's NE wind means the S/SW-facing crag is in the lee, negating the exposed site's usual drying advantage.
Tomorrow brings 0mm rain, SW winds (directly onto the crag face), 77% humidity, and 13.6°C — good drying conditions, but insufficient time alone to dry saturated rock.
Forecast minimum temperatures of -1.3°C on May 6th could cause freeze-thaw damage to still-saturated rock, compounding the structural risk.
Recommendations
3
- Do not climb today — the rock is saturated from 14.8mm of heavy rain and conditions are clearly unsafe for Fell Sandstone.
- Wait at least 48–72 hours from the end of today's rain before considering a visit; the earliest realistic window is May 6th, and even then assess carefully on arrival.
- On your next visit, check the ground at the crag base — if it is not completely sandy-dry, assume the rock interior is still too wet and walk away.
Do Not Climb
95%
4 days ago
Great Wanney received 15.9mm of heavy rain today with 96% humidity and light NE winds — the rock is currently saturated and completely unsuitable for climbing. Given the porous Fell Sandstone and the cumulative moisture from a wet recent period (17.8mm in the last 7 days), a minimum of 48–72 hours of dry weather with favourable winds is needed before conditions can be reassessed.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Great Wanney's S/SW aspect means today's NE wind provides minimal drying benefit as it blows across rather than onto the main face, and the crag will receive no direct wind-driven evaporation until the wind shifts SW tomorrow.
- The 20–30 minute boggy moorland approach will itself be waterlogged after 15.9mm of rain, and saturated ground at the crag base is a reliable indicator that the rock interior remains wet.
- The escarpment's 10–20m height means the lower sections — where many of the classic VDiff and Severe routes start — will retain moisture longest as water drains downward through the porous sandstone.
- Recent weeks have seen repeated small rain events (April 11–17 produced ~20mm across multiple days) interspersed with incomplete drying periods, meaning the sandstone likely entered today's heavy rain already carrying residual internal moisture.
Warnings
3
- 15.9mm of heavy rain today on already-damp Fell Sandstone means the rock is deeply saturated — surface drying will mask dangerous internal moisture for days.
- Climbing on wet Fell Sandstone causes permanent hold breakage and route degradation; the NMC ethic of 'Love the rocks' must be respected.
- The boggy moorland approach will be treacherous after today's heavy rain; allow extra time and wear appropriate footwear if visiting to check conditions.
Reasoning
The rock is currently saturated after 15.9mm of heavy rain today at 96% humidity, compounded by residual moisture from 17.8mm over the past week with average humidity of 83%.
Today's NE wind at 16.6 km/h offers negligible drying on the S/SW-facing crag; meaningful drying cannot begin until the wind shifts SW tomorrow, and even then 48–72 hours of dry weather will be needed after this volume of rain.
At current saturation levels the sandstone will have lost 30%+ of its compressive strength, and the iron oxide holds are at serious risk of breakage — climbing now would cause permanent, irreversible damage to routes.
Spring conditions in early May at 280m remain cool (average 7.7°C last week) with overnight frosts still occurring, which slows drying and introduces minor freeze-thaw risk on saturated rock tonight with a forecast low of 3.7°C.
Contributing Factors
6
15.9mm of rain today is the heaviest single-day total in the past month, thoroughly saturating the porous Fell Sandstone.
96% humidity today effectively halts evaporation, meaning no meaningful drying can occur until humidity drops significantly.
NE wind at 16.6 km/h blows away from the S/SW-facing crag, providing minimal surface drying benefit to the main climbing faces.
17.8mm over the last 7 days and 43.8mm over 28 days with average 83% humidity means the rock had residual internal moisture before today's heavy rain.
The high, open moorland position ensures no sheltering trees and good airflow, which will aid drying once conditions improve tomorrow.
The south/south-west facing aspect will receive good solar radiation once skies clear, helping to drive evaporation from the rock surface from tomorrow onward.
Recommendations
3
- Do not visit today — the rock is saturated and climbing would damage holds and routes permanently.
- Monitor conditions and plan for the earliest realistic window around May 6th, after two full dry days with lower humidity and favourable winds.
- On arrival, check the ground at the crag base: if the soil and sand are not bone-dry, the rock interior is still too wet to climb safely.
Do Not Climb
45%
5 days ago
Despite a relatively dry recent week (only 2.0mm in 7 days), today has trace precipitation, high humidity (85%), and the consecutive dry day count is zero — the rock has not had a convincing uninterrupted drying window. With 31.1mm over the past 28 days keeping background moisture levels elevated and significant rain forecast tomorrow (6mm), conditions are too uncertain to recommend climbing today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Great Wanney's exposed moorland setting at 280m means the walk-in will be boggy after the recent wet April — if the ground at the crag base is damp, the rock is almost certainly still holding internal moisture.
- The S/SW aspect is favourable for solar drying in spring, but recent winds have been predominantly easterly (sheltering this face from direct wind-driven drying) which reduces the crag's usual exposed-site drying advantage.
- The crag's 10–20m height means lower sections will retain moisture longer than upper faces; the serious VDiff and Severe routes on lower tiers are most at risk of hidden dampness.
- April's cumulative 31mm of rainfall across frequent small events means the sandstone has rarely had a chance to fully dry internally — a pattern that keeps background saturation elevated even when the surface appears dry.
Warnings
2
- Do not climb on Fell Sandstone today — the zero consecutive dry days and high humidity mean internal moisture is very likely present despite any surface drying.
- Significant rain (6mm) is forecast for tomorrow, which will reset drying and keep the rock unsuitable through at least mid-week.
Reasoning
The rock received 1.6mm on May 1st and trace precipitation today (0.1mm), following a wet April with 31mm spread across many events — internal moisture levels are likely still elevated despite the surface possibly appearing dry in places.
Since the last meaningful rain (1.6mm on May 1st), only ~24 hours have elapsed with moderate temperatures but high humidity (85%) and modest westerly wind (18 km/h) — insufficient drying time for porous Fell Sandstone, especially given that recent easterly winds have not been hitting the S/SW face effectively.
The repeated wetting-drying cycles through April combined with overnight sub-zero temperatures (several nights below 0°C recently) create cumulative freeze-thaw stress; climbing on incompletely dried rock risks hold breakage on this irreplaceable crag.
Early May in Northumberland at 280m is transitional — daytime temperatures are reasonable (10–14°C) but overnight frosts are still occurring, and the long wet spring means the sandstone has had limited opportunity to shed deep-seated moisture.
Contributing Factors
7
Rain of 1.6mm yesterday and 0.1mm today means the consecutive dry day count is zero, giving the rock no uninterrupted drying window.
Humidity at 85% today significantly slows evaporation from the rock surface, limiting drying even where wind is present.
31.1mm over 28 days spread across many small events has kept the sandstone repeatedly wetted without adequate drying intervals, maintaining elevated internal saturation.
The south/south-west facing aspect receives good spring solar radiation during the day, aiding surface evaporation.
Prevailing easterly winds over the past week do not directly hit the S/SW face, reducing the exposed site's usual wind-drying advantage.
Daytime highs of 10–14°C are warm enough to support some evaporation, though overnight frosts slow the process.
Several recent nights have dropped below 0°C (e.g. -0.6°C on Apr 30, -0.2°C on Apr 29), raising freeze-thaw concerns if the rock retains internal moisture.
Recommendations
3
- Wait for a sustained dry spell of at least 48 hours with favourable winds before visiting — the forecast suggests May 7–8 may offer the next realistic window.
- If you do visit, check the ground at the base of the crag: if it is damp or muddy rather than sandy-dry, do not climb.
- Consider the boggy approach — bring appropriate footwear and allow extra time for the 20–30 minute walk-in, which will be wet underfoot.
Marginal — Assess Conditions
55%
6 days ago
Great Wanney has had a largely dry spell from April 22–30 with only trace precipitation, but today (May 1) brought 0.9mm of rain and humidity has been moderate-to-high recently. The S/SW aspect and exposed position are favourable for drying, and the extended dry spell likely allowed good internal drying, but today's rain and the persistent ~80% humidity over the past week introduce enough uncertainty to warrant on-site assessment.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Great Wanney's 10–20m escarpment can have seepage at the base and in crack lines even when upper sections appear dry, particularly after the wetter mid-April period (7.9mm on April 15).
- The exposed moorland setting means the crag benefits enormously from wind-driven drying, but recent days have seen lighter, easterly winds that don't impact the S/SW face as effectively.
- The walk-in crosses boggy moorland — if the approach is waterlogged, that's a useful proxy indicator that conditions at the crag may still be damp.
- The crag's iron oxide cemented holds are the most vulnerable features when wet; many routes here are notoriously bold for their grade, making hold integrity especially safety-critical.
Warnings
2
- Today's 0.9mm rain means the surface may still be damp — do not assume a warm afternoon has dried the rock through; Fell Sandstone can appear surface-dry while remaining dangerously weak internally.
- The forecast brings further rain from tomorrow (1.4mm May 2, 5.0mm May 3), so today may be a narrow window — but only if on-site conditions confirm dryness.
Reasoning
The rock benefited from an 8-day essentially dry window (April 22–30, only trace amounts totalling 0.3mm), but today's 0.9mm rain at 69% humidity will have re-wetted the surface, and the preceding week averaged 80% humidity which slows evaporation from depth.
The S/SW aspect receives good solar radiation in late April/early May, and the exposed position helps, but recent winds have been predominantly easterly (sheltered side of the crag), reducing the effective wind-driven drying on the climbing face; today's 0.9mm in mild 20°C conditions should dry quickly but adds fresh surface moisture.
The extended dry spell from late April likely allowed good internal drying reducing freeze-thaw and saturation risk, but the cumulative 33.8mm over 28 days and repeated wetting-drying cycles through April mean some internal moisture may persist in deeper pores and crack systems.
Early May in Northumberland brings improving daylight hours and solar angles which aid drying, but overnight frost risk persists (several nights below 0°C in recent days) and the altitude of 280m keeps temperatures cooler than lowland sites.
Contributing Factors
7
From April 22–30 only 0.3mm of trace precipitation fell over 9 days, allowing significant internal drying of the sandstone after the wetter mid-April period.
Today's 0.9mm will have re-wetted the rock surface, though the warm 20°C temperatures and moderate wind should promote rapid surface drying.
The 7-day average humidity of 80% significantly slows evaporative drying, meaning internal moisture may not have fully dissipated despite the dry spell.
The south/south-west facing aspect and exposed moorland position are ideal for solar drying and wind exposure, making this one of Northumberland's faster-drying sandstone crags.
Recent prevailing easterly winds would have been partially sheltered from the S/SW face, reducing the effective wind-drying benefit on the climbing surface.
Significant total precipitation through April, with several multi-millimetre events in mid-month, means the rock endured repeated saturation cycles before the late-April dry window.
Today reached 20.3°C and late April saw several days above 12°C, which significantly aids evaporative drying compared to winter conditions.
Recommendations
3
- Visit the crag and perform a thorough touch-test on holds and in crack lines before committing to climb — if any dampness is detected, especially at the base or in horizontal breaks, do not climb.
- Check the ground at the base of the crag: if the soil and rock debris are not thoroughly dry, the sandstone above is almost certainly still holding moisture internally.
- If conditions pass the on-site assessment, favour upper and more exposed sections of the crag which will have dried fastest, and avoid any routes with known seepage or drainage lines.
Marginal — Assess Conditions
62%
9 days ago
The last meaningful rain was 1.0mm on April 21st, giving approximately 8 days of mostly dry weather with only trace precipitation since, but persistently high humidity (averaging 80%) and moderate temperatures have slowed drying. The S/SW aspect and exposed position are favourable, and conditions are likely approaching acceptable, but the cumulative April rainfall (33.9mm) and recent high overnight humidity warrant on-site verification before committing to climb.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Great Wanney's exposed moorland position at 280m means the approach track can be very boggy after the wet April — if the ground at the crag base is still damp, the rock interior is likely still holding moisture.
- The S/SW aspect receives good spring sunshine and the crag catches wind well from the prevailing SW direction, making it one of the faster-drying Fell Sandstone venues, but easterly winds over recent days have been less effective at drying a south-facing face.
- The 10–20m escarpment means lower sections and any north-facing returns or gullies will retain moisture significantly longer than the upper, sun-exposed walls.
- The crag saw substantial cumulative rainfall through April (33.9mm across frequent small events), meaning the sandstone has had repeated wetting cycles with limited opportunity for deep drying between them.
Warnings
2
- Do not climb on any sections that feel cool or damp to the touch — Fell Sandstone loses significant strength at very low moisture levels and surface dryness can mask internal saturation.
- The cumulative wet April means holds may be more fragile than usual even if the surface appears dry; climb with particular care on thinner features.
Reasoning
The last significant rain (1.0mm) fell on April 21st, with only trace amounts (0.1mm on 26th, 27th, 28th) since — the surface should be dry, but 33.9mm of cumulative April rainfall with frequent re-wetting means deeper pore moisture may persist.
Eight days since the last real rain with the S/SW aspect is promising, but recent winds have been from the E/NE (unhelpful for a south-facing crag), humidity has averaged 80%, and overnight humidity has been in the 90s, significantly slowing evaporative drying.
The repeated wetting-drying cycles through April and overnight temperatures dipping below 0°C on several occasions (e.g. -3.0°C on April 24th) raise some concern about cumulative freeze-thaw stress, though the rock is unlikely to be critically saturated at this point.
Late April is transitional — improving solar angle and day length help drying, but spring weather in Northumberland remains cool and humid, and the crag has endured a typically wet April.
Contributing Factors
8
Eight days since the last meaningful precipitation (1.0mm on April 21st), with only trace amounts since, exceeding the minimum 48-hour guideline for light rain.
33.9mm over the month with frequent small events means the sandstone has been repeatedly wetted without extended deep-drying periods.
Average humidity of 80% over the last 7 days with overnight values reaching 96–97% severely limits net evaporation, especially during the long spring nights.
The south/south-west facing escarpment maximises solar exposure during lengthening April days, significantly aiding surface and near-surface drying.
The open moorland setting normally aids drying considerably, though recent easterly winds have been less effective at stripping moisture from the south-facing rock face.
Winds have been predominantly easterly/north-easterly over the past week, which are less effective at drying a S/SW-facing crag compared to the usual prevailing westerlies.
Daytime highs of 8–17°C are adequate for drying but overnight lows near or below freezing limit 24-hour drying effectiveness.
The 0.1mm on each of April 26th, 27th, and 28th is negligible in isolation but indicates lingering damp air masses and possible condensation/mist on the rock surface.
Recommendations
3
- Perform a thorough touch-test on the rock at multiple heights before climbing — if any dampness is detected, especially at lower levels or in recesses, do not climb.
- Check the ground at the base of the crag: if the soil and vegetation are still noticeably moist or boggy, assume the rock interior has not fully dried.
- Conditions should improve significantly through April 30th and May 1st with the forecast dry, warm weather (up to 19°C) — if in doubt today, waiting one more day is the responsible choice.
Climbing Outlook