Condition Analysis
AI-powered assessment using site data and 14-day weather history
Castle Rock of Triermain is saturated after an exceptionally wet fortnight (135mm in 28 days) with virtually no drying windows, and today brings further light rain with near-100% humidity and full cloud cover. The forecast shows heavy rain continuing through the week, making conditions unsuitable for climbing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will be running heavily after 135mm of rain in 28 days, with particular concentration on the last two weeks — these can take days to clear even after rain stops.
- The W/NW aspect means the crag misses morning sun entirely and relies on afternoon sun for drying, but persistent 100% cloud cover today and this week eliminates any solar drying.
- Peregrine nesting restrictions may still apply in early June — check the BMC RAD before planning a visit even once conditions improve.
- The crag's 300m altitude combined with recent average temperatures of just 9°C significantly slows evaporation compared to valley-floor venues.
Warnings
2
- Friction on BVS rock is dramatically reduced when damp — do not attempt steep or poorly-protected routes (e.g. Overhanging Bastion, North Crag Eliminate) until surfaces are confirmed dry by touch.
- Seepage lines on the north crag may persist for several days after rain stops and can wet routes that otherwise appear dry from below.
Reasoning
The rock surface is almost certainly wet or damp: 135mm over 28 days with heavy events on June 3–4 (46mm), June 8–9 (37mm), and June 11 (12mm), plus only two dry days (June 14–15) before today's renewed rain, means seepage lines are fully charged and surfaces have had minimal drying.
The brief dry window on June 14–15 with moderate NW/SE winds would have begun surface drying, but humidity remained above 80% and temperatures were cool (8–13°C), so deep seepage and sheltered areas will not have dried — today's renewed precipitation resets the limited progress.
Borrowdale Volcanic rhyolite is non-porous and not at risk of structural damage, so hold breakage is not a concern even in these saturated conditions.
Early June in the Lakes should offer improving conditions, but this has been an anomalously wet and cold spell with temperatures 5–8°C below seasonal norms, dramatically slowing any drying between rain events.
Contributing Factors
7
135mm in 28 days with major events on June 3–4, 8–9, and 11 have kept the crag perpetually wet with no meaningful drying window.
Average humidity of 89% over the last 7 days and 92% today prevents effective evaporation even during dry spells.
100% cloud cover throughout most of today eliminates solar drying on the west-facing aspect.
Average temperatures of just 9°C over the past week at 300m altitude significantly slow evaporative drying.
SW winds of 20–35 km/h provide some air movement to aid surface drying during any dry hours, but are insufficient to overcome the moisture load.
BVS rhyolite does not absorb water, so surface drying can begin immediately once rain stops and conditions allow.
The north crag's known seepage lines will be running after weeks of heavy rain and will take multiple dry days to clear.
Recommendations
3
- Do not climb today or in the coming days — wait for a sustained dry spell of at least 2–3 days with lower humidity before visiting.
- Check the BMC RAD for any active peregrine nesting restrictions at Castle Rock before planning a trip.
- When conditions do improve, prioritise the south crag and routes away from known seepage lines on the north crag, as these will dry last.
Previous Analyses
Do Not Climb
40%
2 days ago
Castle Rock of Triermain has been subjected to an exceptionally wet fortnight with over 133mm of rain in 28 days and significant heavy falls on June 3–4 (46mm), June 8–9 (37mm), and June 11 (12mm), with only brief dry spells between. Although today is largely dry, the rock has had barely one full dry day since the last rain on June 13, humidity remains high (~79%), and persistent overcast skies with a NW-facing aspect severely limit drying — seepage lines on the north crag are almost certainly still running.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will almost certainly still be active after 133mm of rain in the last 28 days, with heavy pulses on June 3–4 and June 8–9 saturating drainage channels.
- The W/NW aspect means the crag receives only limited afternoon sun, and today's 100% cloud cover through most of the day eliminates even that benefit.
- Check for peregrine nesting restrictions before visiting — spring/early summer restrictions may still be in effect at Castle Rock.
- The approach from the A591 is short, so retreating if conditions are worse than expected is straightforward compared to more remote Lake District venues.
Warnings
2
- Seepage lines on the north crag are very likely still active and could make routes dangerously slippery — avoid seepage-prone lines entirely.
- The forecast shows no meaningful dry spell in the next 5 days; conditions are likely to worsen before they improve.
Reasoning
With 29.5mm in the last 7 days, 133mm in 28 days, and only ~1.5 dry days since the last meaningful rain (1.0mm on June 13), residual surface moisture and active seepage lines are highly likely despite the non-porous rock type.
The NW-facing aspect receives minimal direct sun, today is fully overcast, humidity is 71–82%, and while moderate SE winds (23 km/h) provide some drying, conditions have been insufficient to fully clear moisture from seepage-prone areas after such a prolonged wet spell.
Borrowdale Volcanic Series rock is non-porous and does not suffer structural damage when wet, so hold breakage is not a concern.
Early June in the Lake District should offer reasonable drying potential, but this period has been anomalously wet and cool (average 8.4°C over 7 days), suppressing the expected seasonal drying advantage.
Contributing Factors
7
133mm over 28 days with major downpours on June 3–4 (46mm combined) and June 8–9 (37mm combined) have saturated the ground and fed persistent seepage lines.
Only about 1.5 dry days since the last rain on June 13, with high ambient humidity (83–91%) limiting evaporation.
100% cloud cover through most of today eliminates solar drying, compounding the W/NW aspect's already limited sun exposure.
SE winds at 23 km/h provide some surface drying effect on exposed faces, though the crag's partial shelter limits this benefit.
BVS rhyolite does not absorb water, so surface moisture will clear faster than on porous rock once conditions improve.
Humidity remains 71–87% through today and tomorrow's forecast shows 90% humidity with 4.1mm rain, preventing meaningful drying progress.
The 5-day forecast shows 40.2mm of further rain with no sustained dry window, meaning conditions will not improve this week.
Recommendations
3
- Wait for a sustained dry spell of at least 2 days with lower humidity before visiting, as seepage lines from weeks of heavy rain will take time to abate.
- If visiting today during the dry afternoon window (roughly 10:00–18:00), restrict yourself to well-drained, exposed south-facing sections and be prepared to retreat if surfaces feel greasy.
- Check the BMC RAD for current peregrine nesting restrictions before planning a visit to Castle Rock.
Do Not Climb
35%
3 days ago
Castle Rock has endured an exceptionally wet fortnight with over 130mm of rain in the last 28 days, including heavy falls of 24mm+ on June 4th and 8th, and 11.8mm just three days ago. Although today is the first dry day and non-porous BVS rock can dry relatively quickly, persistent seepage lines on the north crag, high ambient humidity (82–96%), and cool temperatures make it very likely that significant damp patches remain across the crag.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will almost certainly still be running after this prolonged wet spell, potentially affecting routes like North Crag Eliminate for days.
- The W/NW aspect means only afternoon sun reaches the crag — morning sessions will find the rock at its dampest, and the low June sun angle may not fully penetrate the steeper buttresses.
- Peregrine nesting restrictions may still be in effect in early June — check the BMC RAD and any local signage before approaching the crag.
- The sustained period of near-saturated humidity (89% average over 7 days) will significantly slow surface evaporation even on this non-porous rock, and mossy or lichenous sections will retain a greasy film.
Warnings
3
- Seepage lines on the north crag are almost certainly still active and will make routes dangerously slippery.
- The combination of steep, serious routes and reduced friction on damp BVS rock creates a significant fall risk — this crag has a mountain atmosphere and consequences to match.
- Wind gusts have been strong recently (up to 42.5 km/h); exposed stances and belays may be uncomfortable and cold at 300m.
Reasoning
With 54mm in the last 7 days, only one dry day so far, and humidity at 82% today, the rock surface is very likely still damp in sheltered areas and seepage lines will be active.
One dry day with moderate NW wind (21.6 km/h) and a W/NW aspect gives limited drying — exposed sun-catching faces may be surface-dry by late afternoon, but shaded and north-facing sections will retain moisture.
BVS rhyolite is non-porous so there is no structural risk from moisture, but friction is severely compromised on damp volcanic rock.
Early June temperatures averaging only 8°C over the past week are unusually cool, slowing evaporation; the ground and crag base will be saturated, feeding ongoing seepage.
Contributing Factors
6
Over 130mm in 28 days with multiple heavy events (24mm+ on June 4 and 8) has thoroughly saturated the surrounding ground and activated seepage lines.
A single dry day is insufficient to clear seepage and damp patches after such sustained wet weather, particularly on a NW-facing crag.
Humidity at 82% today and averaging 89% over the past week dramatically slows surface evaporation.
Average temperatures of just 8°C over the past week at 300m altitude provide minimal evaporative energy.
NW wind at 21.6 km/h will help dry exposed faces, though the partial shelter of the crag limits its effectiveness.
BVS rhyolite does not absorb water so there is no structural damage risk, and exposed surfaces can dry relatively quickly in good conditions.
Recommendations
3
- Wait for at least two consecutive dry days with lower humidity before attempting routes, especially on the north crag where seepage persists longest.
- If visiting, focus only on the most exposed, sun-catching sections of the south crag in late afternoon and be prepared to walk away if the rock feels greasy.
- Check the BMC RAD for any active peregrine nesting restrictions before planning a visit.
Do Not Climb
30%
4 days ago
Castle Rock has endured a prolonged wet spell with over 60mm in the last 7 days and 133mm in the last 28 days, with rain again today and zero consecutive dry days. Although the rock is non-porous, persistent seepage lines, saturated ground, and very high humidity (91% average) mean surfaces are almost certainly wet and friction will be poor.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will be running heavily after this sustained wet period — expect persistent weeping on routes like North Crag Eliminate for at least 24–48 hours after rain stops.
- The W/NW aspect means the crag only catches afternoon sun, and with recent temperatures averaging just 8°C, morning drying will be minimal even on forecast dry days.
- Peregrine nesting restrictions may still be in effect in early June — check the BMC RAD or local notices before visiting, as some routes may be closed.
- The strong winds (30–40 km/h) over the past week will have aided surface drying between showers, but with rain falling almost daily the rock has had no chance to fully dry out.
Warnings
2
- Friction on BVS rock is dramatically reduced when damp — after this sustained wet period, surfaces that look dry may still have a moisture film, especially in shaded areas.
- Wind chill at 300m with 37 km/h gusts today gives a feels-like temperature well below the 9.6°C ambient — dress warmly and consider exposure risk on long routes.
Reasoning
With rain on 9 of the last 10 days totalling over 60mm, including 24.9mm on June 8 and 11.8mm on June 11, and further rain today, the rock surface is currently wet with active seepage lines.
Despite moderate-to-strong SW/W winds, the near-daily rainfall and 91% average humidity have prevented any meaningful drying period; the W/NW aspect and 300m altitude further slow evaporation.
BVS rhyolite is non-porous and suffers no structural damage from saturation, so hold breakage is not a concern.
Early June should offer improving conditions, but this has been an exceptionally wet and cool spell with temperatures 5–8°C below seasonal norms, significantly slowing drying.
Contributing Factors
7
Over 60mm in the last 7 days with rain on nearly every day means the crag has had no opportunity to dry.
Average humidity of 91% over the past week severely inhibits surface evaporation even between showers.
1.2mm of rain today with 89% humidity means rock surfaces are currently damp or wet.
Temperatures averaging just 8°C over the past week are well below June norms, reducing evaporation rates.
Winds of 30–40 km/h provide some surface drying between showers, though insufficient to overcome persistent rain.
BVS rhyolite does not absorb water, so once rain stops and surface moisture evaporates, friction returns quickly.
The W/NW facing aspect limits direct sun exposure to afternoons only, slowing morning drying considerably.
Recommendations
3
- Wait for at least a full dry day with lower humidity before visiting — tomorrow (June 14) looks like the first potential drying day but assess conditions on arrival.
- Check for active seepage on the north crag before committing to routes there, as these lines can persist for 48+ hours after prolonged rain.
- Verify current peregrine nesting restrictions via the BMC RAD before planning your visit.
Do Not Climb
90%
5 days ago
Castle Rock of Triermain is currently saturated after an exceptionally wet period — nearly 64mm in the last 7 days and 132mm over 28 days — with rain again today and high humidity. Even though BVS rock is non-porous, persistent seepage lines, surface water, and near-zero drying between rain events make friction dangerously unreliable on this steep, serious crag.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will be running heavily after 132mm in 28 days, and these can take several dry days to abate given the W/NW aspect and limited direct sun.
- West-facing aspect means the crag only receives afternoon sun, and with current cloud cover and humidity above 89%, effective solar drying is minimal.
- Strong westerly winds today (40 km/h) are hitting the crag face-on, which aids surface evaporation but cannot clear seepage or water pooling in cracks and horizontal breaks.
- Castle Rock's steep routes like Overhanging Bastion demand excellent friction — the consequence of a friction failure on these serious E-grade trad lines is severe.
Warnings
3
- Steep E-grade routes on wet BVS rock are extremely dangerous — friction loss on this rock type is dramatic when damp, and falls on these serious trad routes carry high consequence.
- Seepage lines on the north crag may persist for several days after rain stops given the saturated ground conditions.
- Wind chill at 300m with 40 km/h winds brings feels-like temperatures well below the 12°C ambient — hypothermia risk if delayed on route.
Reasoning
The rock surface is almost certainly wet today: 1.2mm rain fell today on top of 63.9mm in the past week, with humidity at 89% and average temps of only 8.3°C providing virtually no drying capacity.
There have been zero consecutive dry days, and the W/NW aspect with limited morning sun means drying relies heavily on wind; while winds are strong (40 km/h W), they cannot overcome continuous re-wetting from daily rainfall and saturated ground feeding seepage.
BVS rhyolite is non-porous and structurally sound even when saturated, so hold breakage is not a concern.
Despite being early summer, temperatures are running well below seasonal norms (averaging 8.3°C over the past week) with persistent Atlantic weather systems bringing repeated frontal rain — conditions more typical of autumn.
Contributing Factors
7
63.9mm in the last 7 days and 132.2mm over 28 days represents a thoroughly saturated catchment feeding seepage lines on the crag.
1.2mm fell today continuing an unbroken run of wet days, meaning no meaningful drying window has occurred.
Humidity averaging 91% over the past week severely inhibits evaporation even with wind present.
40 km/h W wind hits this W/NW-facing crag directly, aiding surface evaporation once rain stops.
Average 8.3°C over the past week at 300m altitude limits evaporative drying capacity.
BVS rhyolite does not absorb water or weaken structurally, so drying is purely a surface concern once seepage stops.
The W/NW aspect receives no direct sun until afternoon, delaying the start of solar-assisted drying each day.
Recommendations
3
- Do not visit today — the crag will be wet and seeping; wait for at least 1–2 full dry days with lower humidity before considering a visit.
- Target June 15 as the earliest realistic window: after a dry June 14 with NW breeze and lower humidity, surface conditions may have improved enough to assess on arrival.
- Check for peregrine nesting restrictions before visiting — spring restrictions may still be in effect in early June; consult the BMC RAD for current status.
Do Not Climb
92%
6 days ago
Castle Rock of Triermain is currently soaked after an exceptionally wet 10-day period totalling over 120mm, with persistent rain continuing today and humidity at 100%. The crag is fully wet with active seepage lines likely across all sections; conditions are unsafe for climbing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will be running heavily after 120mm+ in 10 days, and these can persist for days even after rain stops.
- The W/NW aspect receives no morning sun, meaning drying relies heavily on wind and afternoon sun — both limited under current overcast, saturated conditions.
- At 300m altitude with temperatures around 7–11°C and 100% humidity, evaporative drying is effectively stalled today.
- Check for peregrine nesting restrictions before any visit — spring/early summer restrictions may still be active at this crag.
Warnings
3
- Active rainfall and 100% humidity make rock surfaces extremely slippery — friction on BVS rock is severely compromised when wet.
- Strong gusty winds (up to 42 km/h forecast) create additional hazard on exposed routes, particularly on the upper pitches of the main buttress.
- Seepage lines on the north crag are likely to persist for 24–48 hours after rain finally stops given the volume of recent rainfall.
Reasoning
The rock is thoroughly wet: 61.6mm in the last 7 days alone, rain falling today throughout the day, and humidity at 96–100% preventing any surface drying.
Despite moderate-to-strong SW winds (~30 km/h), 100% cloud cover and near-saturation humidity mean virtually no evaporative drying is occurring; the W/NW aspect receives no useful sun under these conditions.
BVS rhyolite is non-porous and suffers no structural damage when wet, so hold breakage is not a concern.
Early June should offer reasonable conditions, but this is an unusually prolonged wet spell with well-below-average temperatures for the season, mimicking late-autumn drying conditions.
Contributing Factors
6
Over 120mm in the last 10 days with 61.6mm in the past week alone means the crag and surrounding ground are fully saturated.
Approximately 8mm of rain is forecast throughout today with no dry window, keeping all surfaces actively wet.
Humidity has been 90%+ for over a week and is at 100% today, completely preventing surface drying.
Sustained SW winds of 25–36 km/h provide some drying potential once rain ceases, though currently negated by continuous precipitation.
Temperatures of 7–11°C are well below seasonal norms, significantly slowing evaporation rates.
The W/NW facing crag receives limited direct sun and none at all under persistent 100% cloud cover.
Recommendations
3
- Do not climb today — the crag is actively wet with rain continuing and no drying window available.
- Consider visiting on or after June 14th when a dry, sunnier spell with lower humidity is forecast, but check seepage lines on arrival.
- Verify peregrine nesting restrictions with the BMC RAD before planning any visit to Castle Rock of Triermain.
Do Not Climb
90%
8 days ago
Castle Rock of Triermain has received nearly 90mm of rain in the past 7 days with ongoing showers today, leaving surfaces thoroughly wet and seepage lines actively running. Combined with near-freezing temperatures, 100% cloud cover, high humidity, and strong winds, conditions are unsuitable for climbing today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will be actively flowing after 89mm of rain in the past week, and these can persist for days even after rain stops.
- The W/NW aspect means the crag catches afternoon sun, but with 100% cloud cover and temperatures around 5–8°C at 300m, there is no meaningful solar drying today.
- Wind gusts of 30+ km/h from the west are hitting the crag face-on, creating significant wind chill (feels-like near 0°C) and making exposed routes like Overhanging Bastion hazardous.
- Check peregrine nesting restrictions before visiting — spring/early summer restrictions may still be in effect at this crag.
Warnings
3
- Active seepage lines on the north crag will make routes dangerously slippery — avoid until well dried.
- Wind chill at the crag is near freezing; hypothermia risk is real for anyone caught out on a long route.
- Approach paths will be muddy and watercourses swollen after prolonged heavy rain.
Reasoning
The rock surface is currently wet from intermittent showers throughout the day (4.9mm total), on top of an extremely wet week (89mm in 7 days) that has saturated every seepage line and drainage feature on the crag.
Despite moderate-to-strong westerly winds hitting the W/NW face directly, persistent cloud cover, near-constant drizzle, humidity around 88–97%, and temperatures of only 5–8°C at crag altitude mean virtually no effective drying is occurring.
Borrowdale Volcanic rock is non-porous so there is no structural damage risk from the wet conditions, but friction is severely compromised on these saturated surfaces.
Early June should offer improving conditions, but this prolonged wet and cold spell is unusually poor; temperatures at 300m are more reminiscent of March than June, and the crag is well below the cloud base.
Contributing Factors
6
89mm in the past 7 days with major deluges on June 3rd (22mm), June 4th (24mm), and June 8th (25mm) have left the crag thoroughly saturated with active seepage.
Intermittent rain throughout the day totalling ~5mm means surfaces have had no chance to begin drying.
Humidity has averaged 91% over the past week and remains 78–97% today, severely inhibiting evaporation from rock surfaces.
Temperatures of 5–8°C at the crag with strong wind chill reduce drying rates and make climbing uncomfortable and risky.
While wind aids drying on non-porous rock, 30+ km/h gusts hitting the W/NW face create dangerous wind chill and handling difficulties on exposed routes.
100% cloud cover for most of the day eliminates any solar heating that would normally help dry the west-facing afternoon aspect.
Recommendations
3
- Do not climb today — the rock is wet, cold, and actively receiving intermittent showers with no realistic drying window.
- Monitor conditions from June 12th onwards when a drier spell is forecast; the crag will need at least 24–36 hours of dry, breezy weather to clear seepage lines after this prolonged wet period.
- Check the BMC RAD for any active peregrine nesting restrictions at Castle Rock before planning a visit.
Do Not Climb
30%
9 days ago
Castle Rock of Triermain has been subjected to nearly 84mm of rain over the past week, with heavy rain again this morning; the crag is almost certainly still wet. Although an afternoon dry window with moderate wind may begin surface drying, persistent seepage lines and high humidity make reliable friction unlikely today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will be actively running after 84mm in seven days, and these can persist for days even after rain stops.
- The W/NW aspect means the crag only receives afternoon sun, so morning visits after overnight rain will find rock still damp — today's clearing doesn't begin until mid-morning at the earliest.
- At 300m altitude with temperatures barely reaching 9°C, evaporative drying is significantly slower than valley conditions would suggest.
- Check for peregrine nesting restrictions before visiting — spring/early summer restrictions may still be in force on parts of the crag.
Warnings
3
- Active seepage lines on the north crag are very likely after this prolonged wet period — avoid routes in known drainage channels.
- Friction on BVS rock drops dramatically when damp; do not trust surface appearance alone, as thin moisture films can be invisible but extremely slippery.
- Wind chill at 300m with 30+ km/h winds and 9°C ambient could produce feels-like temperatures near 0°C — dress for winter conditions.
Reasoning
With 19.7mm falling today (mostly before 08:00) on top of 84mm in the past seven days, the rock surface is saturated and seepage lines on the north crag will be flowing freely.
A dry window from ~08:00 with moderate SW wind (23–25 km/h) and slowly dropping humidity (to ~58% by 15:00) will begin surface drying, but the NW aspect and low temperatures (~9°C) limit evaporation, and heavy recent accumulation means deeper seepage will persist.
Borrowdale Volcanic rock is non-porous and not at risk of structural damage, but the friction-dependent nature of many routes here makes damp surfaces a serious safety concern.
Early June temperatures are unusually low (7–9°C at crag level), reducing drying efficiency; the prolonged wet spell is atypical and has kept the crag in near-constant dampness for over a week.
Contributing Factors
6
Nearly 84mm in the past seven days with 19.7mm today alone has left the crag thoroughly soaked with active seepage.
Rain stops around 08:00 with a dry spell through to ~22:00, accompanied by moderate wind that will begin surface drying.
Maximum temperature of only 9°C at 300m severely limits evaporative drying capacity.
Average humidity over the past week is 91%, and even this afternoon's low of 58% is not ideal for rapid drying.
Sustained 23–25 km/h winds will help strip surface moisture from exposed faces, though sheltered areas will dry more slowly.
11.6mm forecast for June 9th means any drying achieved today will be reversed, with no sustained dry spell in sight.
Recommendations
3
- Wait for a sustained dry spell of at least 24–48 hours before visiting; the current pattern of daily rainfall offers no adequate drying window.
- If you do visit during an afternoon clearing, test friction carefully on lower holds before committing to any route — BVS rock becomes treacherously slick when damp.
- Check the BMC RAD for current peregrine nesting restrictions before planning a visit, as restrictions may apply to parts of the crag in early June.
Do Not Climb
95%
10 days ago
Castle Rock of Triermain is currently saturated after 82mm of rain in the past 7 days, with 16mm falling today and heavy rain forecast to continue through the next 5 days. The rock will be thoroughly wet with active seepage lines, making friction-dependent climbing on BVS rock extremely dangerous.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag seepage lines will be running heavily after this prolonged wet spell and are unlikely to dry out at all during the forecast period.
- The W/NW aspect offers limited afternoon sun, but with persistent cloud cover and near-saturating humidity (93% average over the past week), even afternoon sun windows will achieve very little drying.
- At 300m altitude, temperatures are hovering around 9–10°C — well below seasonal norms for early June — further suppressing evaporation rates.
- Peregrine nesting restrictions may still apply in early June; climbers should check the BMC RAD before planning any visit once conditions eventually improve.
Warnings
3
- Active heavy rainfall today with 16mm and 97% humidity — the crag will be streaming with water.
- Driving SW rain at 37 km/h hitting the W/NW-facing crag directly increases wetting and wind chill risk.
- Persistent seepage lines on the north crag may take several dry days to cease even after rain stops.
Reasoning
The rock is thoroughly wet — 82mm in the past 7 days including 22mm, 24mm, and 16mm days, with humidity consistently above 90%, means every surface and seepage line is saturated.
Zero consecutive dry days and no dry window forecast; even with moderate SW winds, the persistent rain and near-100% humidity prevent any meaningful surface drying.
BVS rhyolite is non-porous and does not suffer structural damage when wet, so hold breakage is not a concern.
Early June should be approaching peak season, but this is an unusually cold and wet spell with temperatures 5–8°C below seasonal averages, dramatically slowing any drying.
Contributing Factors
6
82mm in the past 7 days with no dry days means the crag is completely saturated with active water flow on the rock face.
Average humidity of 93% over the past week with today at 97% prevents any surface evaporation.
55mm of additional rain is forecast over the next 5 days with no dry window, ensuring conditions will remain wet throughout.
Temperatures around 9–10°C at 300m are well below early-June norms, significantly reducing drying potential.
Winds of 25–38 km/h from the SW would normally aid drying, but the W/NW aspect catches this wind along with the driving rain it carries.
BVS rhyolite does not absorb water, so once rain stops and surfaces dry, the rock will recover without needing extended internal drying time.
Recommendations
3
- Do not visit Castle Rock of Triermain until a sustained dry window of at least 24 hours with reduced humidity appears in the forecast.
- Monitor the forecast beyond June 12 — the first potentially dry day appears to be June 13 but data is incomplete and a single day after prolonged saturation may not be sufficient for seepage lines to stop.
- If conditions eventually clear, prioritise south-facing or well-drained routes and avoid the north crag where seepage persists longest.
Do Not Climb
92%
11 days ago
Castle Rock of Triermain is currently saturated after nearly 70mm of rain in the past week, with today adding further precipitation and no dry days recorded. The forecast shows continued rain every day through June 11th, meaning conditions will not improve in the near term.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will be running heavily after this sustained wet spell, and will likely persist for days even after rain stops.
- The W/NW aspect means the crag misses morning sun entirely, and with low cloud base (implied by 92–98% humidity) even afternoon sun is unlikely to reach the rock.
- Check for peregrine nesting restrictions before visiting — spring restrictions may still be in effect into early June.
- The strong SW winds are blowing directly onto the west-facing crag, driving moisture into the rock surface and preventing effective drying.
Warnings
3
- Active seepage lines and streaming water are very likely on the north crag — even holds on steep terrain may be slick.
- SW gale-force gusts (35+ km/h) forecast for June 7th pose a significant safety risk on exposed pitches at this mountain crag.
- Check peregrine nesting restrictions before any visit — some routes may be closed through mid-June.
Reasoning
The rock surface is thoroughly wet — 70mm of rain in 7 days with no consecutive dry days, 92% average humidity, and further rain today means every surface and seepage line is actively running.
Despite moderate-to-strong winds, the SW airflow is saturated (92–98% humidity) and driving rain directly onto the W/NW-facing crag, so wind is actually wetting rather than drying the rock.
BVS rhyolite is non-porous and structurally sound when wet, so there is no hold breakage or rock damage concern.
Early June should offer good climbing conditions, but this spell of cool, wet Atlantic weather with temperatures barely reaching 10°C at valley level means conditions at 300m are genuinely poor.
Contributing Factors
7
Nearly 70mm in the past 7 days with significant falls on June 3rd (22mm) and June 4th (24mm) has left the crag thoroughly saturated.
There has been no dry spell to allow any drying — rain has fallen every day since May 28th.
Average humidity of 92% over the past week with peaks at 98% prevents evaporation and keeps all surfaces damp.
Rain is forecast every day from June 7th through June 11th, totalling over 30mm with no drying window in sight.
Persistent SW winds are blowing saturated Atlantic air directly onto the W/NW-facing crag, compounding the moisture problem.
Temperatures of 9–12°C at valley level mean the crag at 300m is likely around 7–10°C, further slowing any evaporation.
BVS rhyolite will not suffer structural damage, and once a dry window arrives, surface moisture will clear relatively quickly.
Recommendations
3
- Do not visit Castle Rock of Triermain this week — conditions are clearly wet and the forecast offers no improvement until at least June 12th.
- Monitor the forecast for a sustained dry window of at least 24 hours with lower humidity before planning a trip; the non-porous rock can dry quickly once conditions allow.
- If desperate to climb in the Lakes this week, consider a sheltered, low-altitude limestone venue (e.g. Chapel Head Scar) where overhanging routes may stay dry — but still assess on arrival.
Climbing Outlook