Condition Analysis
AI-powered assessment using site data and 14-day weather history
Rothley Crag has had 5 consecutive dry days following only 1.7mm of rain on August 9th, with warm temperatures peaking at 28.9°C and moderate winds — the SE/S-facing Millstone Grit should be thoroughly dry. Conditions today and over the next two days look excellent before rain arrives on August 17th.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The crag's SE/S aspect has benefited from strong solar radiation during the recent warm spell (23–29°C on Aug 11–13), which will have driven deep drying of the porous Millstone Grit.
- Condition reports from spring highlight that north-facing and shady boulders dry significantly slower than sun-facing ones — scattered boulders away from the main buttress may still hold localised dampness in sheltered spots.
- Millstone Grit's coarser grain structure and different porosity compared to Fell Sandstone means it may absorb and release water at slightly different rates, but the 5-day dry spell with warm conditions provides ample margin.
- Open moorland setting at 215m provides reasonable airflow but humidity has averaged 76% over the past week, which is moderate — not ideal but offset by the warm temperatures and wind.
Reasoning
The last meaningful rain was 1.7mm on August 9th — a light shower — followed by 5 fully dry days with warm temperatures up to 28.9°C, which should have fully evaporated any residual moisture from the porous Millstone Grit.
The SE/S aspect has received excellent solar radiation during the recent warm spell, combined with moderate winds (10–24 km/h), providing well over the 24–48 hour minimum drying period needed after such light rainfall.
With 5 days of effective drying after only light rain, internal moisture levels should be negligible and structural risk from wet-weakened holds is very low.
Mid-summer conditions are optimal for gritstone climbing — long daylight hours, warm temperatures, and no freeze-thaw risk; the recent 23–29°C spell represents some of the best drying conditions of the year.
Contributing Factors
6
Five consecutive dry days since the last rain (1.7mm on Aug 9th) comfortably exceeds the 24–48 hour guideline for light rain on porous rock.
Temperatures of 23–29°C over the past three days have driven strong evaporation and deep drying of the rock.
The south/south-east facing main buttress receives excellent solar radiation, accelerating surface and subsurface drying.
Partial wind exposure on open moorland with winds of 10–24 km/h has aided moisture removal from rock surfaces.
Humidity has been moderate at 76% average but not high enough to impede drying given the warm temperatures and wind.
Up to 14.4mm of rain is forecast from August 17th onwards, which will reset drying and likely make conditions unsuitable for several days.
Recommendations
3
- Conditions are excellent today and through August 16th — prioritise climbing before rain arrives on August 17th.
- Check any north-facing or heavily shaded scattered boulders individually, as these dry slower even in good conditions.
- Avoid climbing from August 17th onwards until at least 48 hours of dry weather have elapsed after the forecast rain.
Previous Analyses
Likely Safe to Climb
90%
2 days ago
Rothley Crag has had 4 consecutive dry days following only 1.7mm of rain on August 9th, with warm temperatures (up to 29.6°C today), moderate wind, and a favourable SE/S aspect — the rock should be thoroughly dry. Today and tomorrow look excellent, though light rain returns from the 16th onwards.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley is Millstone Grit rather than the more common Northumberland Fell Sandstone, giving a coarser texture with slightly different porosity — still porous and must not be climbed wet, but it can shed surface moisture differently.
- The SE/S aspect catches good sun from mid-morning onwards, and the open moorland setting means partial wind exposure aids drying effectively.
- Scattered boulders dry at different rates — north-facing sides and shaded bases of larger blocks can hold moisture longer than the main south-facing buttress.
- Condition reports confirm north-facing and shady boulders dry significantly slower than sun-facing ones, even in otherwise good conditions.
Reasoning
The last meaningful rain was 1.7mm on August 9th — four full dry days ago — with only trace amounts (0.1mm) on the 3rd and prior, and the more significant 6.5mm event was nine days ago on August 4th; internal moisture should be fully dissipated.
Four consecutive dry days with temperatures reaching 23–29°C, humidity averaging 70–80% dropping to 36% this afternoon, and moderate SW/W winds of 10–22 km/h on a south-facing open moorland site provide excellent drying conditions well exceeding the 24–48 hour guideline for light rain.
Given the extended drying period and warm summer conditions, compressive strength should be fully restored and there is negligible risk of hold breakage or grain loosening.
Mid-summer conditions are ideal — long daylight hours, warm temperatures, no freeze-thaw risk, and the rock has had ample opportunity to dry after a relatively modest recent rainfall period.
Contributing Factors
6
Four consecutive dry days since the last rain (1.7mm on Aug 9th) far exceeds the 24–48 hour minimum for light rain.
Temperatures of 17–29°C over the drying period drive strong evaporation from the porous Millstone Grit.
The south-facing aspect receives direct solar radiation through much of the day, accelerating surface and subsurface drying.
Sustained winds of 15–25 km/h over recent days on open moorland help move moist air from the rock surface.
Average humidity of 76% over the last week is not ideal but is offset by warm temperatures and wind, dropping to 36% this afternoon.
Light rain (1.2mm) is forecast on the 16th followed by heavier rain (4.7mm) on the 17th, which will end the current dry spell.
Recommendations
3
- Today and tomorrow offer the best conditions — take advantage of the dry, warm weather before rain returns mid-week.
- Check the base of boulders and any north-facing or shaded surfaces for residual dampness, particularly on the scattered outlying blocks.
- After the forecast rain on Aug 16–17, allow at least 48 hours of dry weather before returning.
Likely Safe to Climb
85%
3 days ago
Rothley Crag has had three consecutive dry days following only light rain (1.7mm on Aug 9), with today reaching 26°C and low humidity — excellent drying conditions on this SE/S-facing moorland crag. The rock should be well dried, though any north-facing or shaded boulders may still hold traces of moisture from the unsettled period earlier in the week.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley is Millstone Grit rather than the Fell Sandstone found at most Northumberland venues — coarser texture with slightly different porosity, but still porous and must not be climbed wet.
- Condition reports consistently note that north-facing and shady boulders (e.g. Gloom) dry much more slowly than sun-facing ones — always check shaded problems individually even when the main buttress is dry.
- Open moorland setting at 215m with SE/S aspect means the main faces catch excellent sun and moderate wind, giving above-average drying for Northumberland gritstone.
- Scattered boulder layout means individual blocks have varying aspects and shelter — some tucked-away problems may retain moisture longer than the prominent south-facing buttress.
Reasoning
The last meaningful rain was 1.7mm on Aug 9, followed by three fully dry days including today's warm 26°C peak with humidity dropping to 43% — surface and near-surface moisture should be fully evaporated on south-facing rock.
Three dry days with good temperatures (17–26°C), moderate wind, and a favourable SE/S aspect provide well over the 24–48 hour minimum needed after light rain; the earlier 6.5mm on Aug 4 has had eight dry or near-dry days to clear.
With only light recent precipitation and ample drying time, internal moisture levels should be very low and structural risk from grain loosening is minimal.
Mid-summer conditions are optimal — long daylight hours, warm temperatures, and no freeze-thaw risk; this is the best season for gritstone climbing in Northumberland.
Contributing Factors
6
No rain since the light 1.7mm on Aug 9, comfortably exceeding the 24–48 hour minimum drying window for light precipitation.
Today's peak of 26°C with afternoon humidity as low as 43% provides excellent evaporative drying conditions.
The main buttress faces SE to S, receiving strong summer solar radiation throughout the day to accelerate drying.
Open moorland setting with partial wind exposure and 15–25 km/h winds over recent days has aided moisture removal from rock surfaces.
Trace amounts of 0.1–0.4mm fell on Aug 3, 5, and 6 but these were negligible and have had 6+ days to dry.
6.6mm forecast for Aug 16 followed by 3.7mm on Aug 17 will reset drying clocks later this week.
Recommendations
3
- Main south-facing buttress and sun-exposed boulders should be in excellent condition — enjoy the warm spell.
- Check any north-facing or heavily shaded boulders (e.g. Gloom area) with a touch test before committing, as these dry significantly slower.
- Plan sessions for the next three days to take advantage of the dry window before forecast rain arrives on Aug 16.
Marginal — Assess Conditions
72%
5 days ago
The last significant rain was 6.5mm on August 4th, with only trace amounts since (0.4mm, 0.3mm) and a light 1.7mm shower yesterday (Aug 9). Today is dry with moderate wind, and a warm, dry spell is forecast from tomorrow. The rock should be largely dry on sun-facing surfaces by this afternoon, but yesterday's shower and persistently high humidity (82% average over the past week) warrant visual assessment before committing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley's SE/S aspect catches good sun from mid-morning, meaning the main buttress dries significantly faster than scattered boulders in sheltered or shaded positions.
- The open moorland setting at 215m means the crag benefits from reasonable wind exposure but also higher ambient humidity and cooler overnight temperatures than lowland venues.
- Condition reports from spring confirm that north-facing and shady boulders at Rothley dry much more slowly — expect lingering damp on any problems not in direct sun even after several dry days.
- Millstone Grit's coarser grain structure may allow slightly faster surface drainage than finer Fell Sandstone, but internal porosity still demands proper drying time.
Warnings
2
- Yesterday's 1.7mm shower means some holds may appear surface-dry while retaining internal moisture — test carefully and back off if any dampness is detected.
- Do not climb on any visibly damp or dark-patched rock; Millstone Grit loses significant strength when wet and hold breakage causes permanent damage.
Reasoning
The 6.5mm event on Aug 4 has had roughly 6 days of drying, which is adequate in summer conditions, but intervening trace precipitation (Aug 5: 0.4mm, Aug 6: 0.3mm) and yesterday's 1.7mm shower have topped up surface moisture and potentially slowed full internal drying.
The SE/S aspect and moderate westerly-to-NW winds over the past two days (24–34 km/h) have aided drying significantly; today's clearing skies and ~19 km/h NW wind should continue evaporation, though humidity remains around 80% which limits drying efficiency.
With only 1.7mm yesterday and the main wetting event (6.5mm) now 6 days past, structural risk from internal saturation is low for sun-exposed faces, but shaded boulders could retain enough moisture to weaken holds.
Mid-summer conditions with temperatures in the mid-to-high teens and long daylight hours favour drying; no freeze-thaw risk at this time of year.
Contributing Factors
6
1.7mm fell on August 9, leaving only one full dry day before today, which is borderline for even light precipitation on porous gritstone.
The 6.5mm event on August 4 has had six days of drying with moderate wind, which is generally sufficient for south-facing gritstone in summer.
Average humidity over the past week has been 82%, which significantly slows evaporation and internal drying rates.
The south-facing main buttress receives direct solar radiation from mid-morning, accelerating surface and near-surface drying.
Tomorrow onwards sees temperatures rising to 23–28°C with humidity dropping to 63–73% and no rain until Aug 15, creating excellent drying conditions.
Today's 19 km/h NW wind and the open moorland setting help move moist air away from the rock surface.
Recommendations
3
- If visiting today, focus on sun-exposed south-facing problems on the main buttress during the driest window (late morning to early afternoon) and touch-test holds before committing.
- Avoid any shaded, north-facing, or low-lying boulders today — these will still be holding moisture from yesterday's shower and the persistent high humidity.
- Tomorrow (Aug 11) and the following days look significantly better with warmth, lower humidity, and southerly winds; waiting one day would substantially increase confidence.
Do Not Climb
55%
5 days ago
Today saw 2.3mm of rain on top of a generally unsettled week (9.6mm in the last 7 days), meaning the Millstone Grit is likely still holding internal moisture despite the SE/S aspect. At least 24–48 hours of dry weather with good drying conditions are needed before climbing can be recommended.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley's Millstone Grit is coarser than Fell Sandstone but remains porous and vulnerable to strength loss when wet — the same conservative drying standards apply.
- The SE/S aspect and open moorland setting mean the main buttress catches good sun and wind, but scattered boulders in sheltered or north-facing positions (e.g. 'Gloom') dry significantly slower, as confirmed by condition reports.
- At 215m on open moorland, humidity has averaged 83% over the past week, which substantially slows evaporation even when temperatures are reasonable.
- Recent condition reports from spring show that north-facing and shady boulders can remain damp long after sun-facing ones have dried — always check both sides of boulders before climbing.
Warnings
2
- Do not climb today — the rock is wet from 2.3mm of rain and repeated wetting over the past week.
- The rock surface may appear dry before the interior has dried — use the ground-moisture test and err on the side of caution.
Reasoning
With 2.3mm of rain today and 9.6mm over the past 7 days including a 6.5mm event on Aug 4th, the rock is almost certainly wet internally despite any surface drying between showers.
The consecutive dry spell is currently zero days; while moderate westerly winds (28 km/h today) and the SE/S aspect will help, humidity at 82% today significantly limits evaporation, and meaningful drying cannot begin until tomorrow's forecast dry spell.
With repeated wetting cycles over the past week and high average humidity (83%), the Millstone Grit pores likely remain at or near saturation, posing real risk of hold breakage and grain loosening if climbed on.
Mid-summer temperatures (~15–21°C) and longer daylight hours are favourable for drying, but the persistently high humidity this week has offset those advantages.
Contributing Factors
7
Today's 2.3mm of rain has reset the drying clock, ensuring the rock surface is currently wet.
9.6mm over the last 7 days across multiple events means the rock has had no sustained drying window and is likely saturated internally.
Persistent humidity around 80–91% over the past week severely limits evaporation rates even with moderate wind.
The south-facing aspect catches good solar radiation in summer, which will accelerate surface drying once rain stops.
Open moorland setting with partial wind exposure (28 km/h today, dropping to ~18 km/h tomorrow) will help move moist air away from the rock surface.
Mid-summer temperatures around 16–22°C support reasonable evaporation rates once humidity drops.
Two consecutive dry days forecast with dropping humidity (77% then 74%) should allow meaningful drying, though more rain is forecast for Aug 12.
Recommendations
3
- Wait at least until August 11th before considering climbing, allowing a full 48 hours of dry weather after today's rain.
- On arrival, check the ground at the base of boulders — if the soil or moss is still damp, the rock interior is almost certainly still wet.
- Prioritise the most exposed, south-facing boulders on the main buttress and avoid any shady, north-facing, or sheltered problems which will retain moisture much longer.
Do Not Climb
45%
6 days ago
The most significant recent rain was 6.5mm on August 4th, followed by light drizzle on the 5th, 6th, and today (8th), meaning the rock has not had a sustained dry spell to fully dry out. Although temperatures are reasonable and wind has been moderate-to-strong, the lack of consecutive fully dry days since the heaviest rain means internal moisture is likely still present.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley's Millstone Grit is coarser than Fell Sandstone but remains porous and susceptible to significant strength loss when wet — the same caution applies.
- The SE/S aspect catches good afternoon sun which aids surface drying, but condition reports consistently note that shaded or north-facing boulders retain moisture much longer than sun-facing ones.
- Open moorland setting at 215m provides reasonable wind exposure from the prevailing westerlies, which has been helping drying over recent days.
- Scattered boulder format means individual blocks dry at very different rates depending on their orientation, size, and whether they sit in hollows or on exposed ground.
Warnings
2
- 4mm of rain is forecast for tomorrow (August 9th), which will fully re-wet the rock and require at least 48 hours of subsequent dry weather before climbing.
- Do not rely on surface dryness alone — Millstone Grit can appear dry on the surface while remaining significantly weakened internally.
Reasoning
6.5mm fell on August 4th, with trace amounts (0.3–0.4mm) on the 5th, 6th, and today, meaning the rock has had no truly uninterrupted drying window exceeding 24 hours since the main wetting event four days ago.
Moderate-to-strong westerly/SW winds (24–34 km/h) and temperatures around 15–20°C have aided surface drying on the south-facing aspects, but persistent humidity in the low-to-mid 80s and recurring trace precipitation have prevented deep drying of the porous Millstone Grit.
With only four days since 6.5mm of rain and intermittent drizzle preventing full drying, internal moisture likely remains above the ~1% threshold where significant strength loss begins, posing a real risk of hold breakage on this porous gritstone.
Mid-summer temperatures and day length are favourable for drying, but this has been a notably unsettled spell with high humidity averaging 82% over the past week, limiting the seasonal advantage.
Contributing Factors
6
6.5mm fell on August 4th — a moderate wetting event for porous gritstone — and the rock has had only intermittent drying since.
Light drizzle on August 5th (0.4mm), 6th (0.3mm), and today the 8th (0.4mm) has repeatedly re-wetted the surface, resetting drying progress.
Sustained winds of 22–34 km/h from the west/SW over recent days have aided evaporation from exposed south-facing surfaces.
The south-facing aspect at midsummer receives strong solar radiation, accelerating surface drying on sun-exposed boulders.
Average humidity of 82% over the past week significantly slows evaporative drying, keeping internal moisture levels higher for longer.
4mm of rain is forecast for August 9th, which will re-saturate any partially dried rock and reset the drying clock entirely.
Recommendations
3
- Wait until at least August 11th before considering a visit — the rock needs two full dry days after the forecast rain on the 9th.
- August 12th–13th look most promising with warm temperatures, lower humidity, and no rain forecast — this would be the best window.
- On arrival, check the ground at the base of boulders: if the soil or moss is still damp, the rock is almost certainly still holding internal moisture.
Marginal — Assess Conditions
62%
7 days ago
The most recent significant rain was 6.5mm on August 4th, followed by trace amounts on the 5th and 6th and a dry day today — giving roughly 1 full dry day with good wind but only moderate temperatures. The SE/S aspect and strong westerly/south-westerly winds will have aided drying, but with humidity averaging 84% over the past week and the rain only 3 days ago, some rock faces may still hold internal moisture.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley is Millstone Grit rather than Fell Sandstone, giving coarser grain and slightly different porosity — still highly susceptible to wet-climbing damage but may shed surface moisture marginally faster than finer-grained venues.
- Condition reports confirm that south-facing and wind-exposed boulders dry significantly faster than north-facing or sheltered ones — the scattered boulder layout means drying varies dramatically block to block.
- Open moorland at 215m means the crag benefits from consistent wind exposure, which has been strong (24–34 km/h from W/SW) since the rain on the 4th, meaningfully accelerating surface drying.
- The 6.5mm event on Aug 4th followed a period of intermittent light showers through late July, so baseline moisture levels in the rock are somewhat elevated despite summer conditions.
Warnings
2
- Do not assume all boulders are equally dry — Rothley's scattered layout means individual blocks can vary dramatically in moisture state depending on aspect and shelter.
- Rain is forecast for August 9th and 10th (combined ~2.8mm), which will reset drying progress on exposed surfaces.
Reasoning
The 6.5mm rain on August 4th, plus trace precipitation on the 5th and 6th, means the rock was last meaningfully wetted 3 days ago with only 1 fully dry day since, leaving likely internal moisture especially in sheltered or north-facing boulders.
Strong winds (25–34 km/h from W/SW) and the SE/S aspect have provided above-average drying conditions since the rain, but humidity has remained high (79–91%), limiting the net evaporative potential over just one dry day.
With only one fully dry day since moderate rain and elevated background moisture from late July showers, internal pore saturation in sheltered boulders could still be sufficient to cause grain loosening and hold damage under climbing loads.
Summer temperatures (15–21°C) and long daylight hours favour drying, but the recent spell has been cooler than average and persistently humid, slowing what would normally be rapid summer drying.
Contributing Factors
6
6.5mm fell on August 4th — a moderate event for porous gritstone — followed by trace rain on the 5th and 6th, with only one fully dry day since.
Sustained winds of 25–34 km/h from W and SW since the rain have significantly aided surface evaporation across the open moorland site.
South-facing boulders receive good solar radiation through summer days, accelerating surface and near-surface drying on exposed faces.
Average humidity over the past 7 days has been 84%, limiting net evaporation despite wind and warmth.
Multiple light rain events through late July (totalling ~16mm over 28 days) have kept baseline rock moisture somewhat elevated, extending required drying time after the Aug 4th event.
Temperatures of 15–21°C provide reasonable evaporative energy, though the recent days have been cooler than peak summer norms.
Recommendations
3
- Tomorrow (Aug 8th) offers the best near-term window — check south-facing, wind-exposed boulders first and apply the touch test before committing to any problem.
- Avoid north-facing, sheltered, or low-lying boulders which will retain moisture longer — stick to prominent, sun-exposed faces.
- If the ground at the base of any boulder is still damp or the rock darkens when touched, do not climb that block and wait for further drying.
Marginal — Assess Conditions
68%
9 days ago
The last significant rain was 6.5mm on August 4th, with only a trace 0.5mm on the 5th and a dry day today — giving roughly 1.5 dry days so far. While the SE/S aspect, strong winds (33+ km/h today), and summer temperatures are favourable for drying, humidity has been persistently high (82% average over the past week) and the 48-hour minimum drying window after moderate rain has not yet been fully met. Conditions should be assessed on arrival, particularly on exposed, sun-facing faces which may be climbable this afternoon.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley's Millstone Grit is coarser than the local Fell Sandstone, with different porosity — it can feel surface-dry while retaining internal moisture, so the touch test alone is unreliable.
- Historic condition reports confirm that north-facing and shady boulders at Rothley dry significantly slower than sun-facing ones — the scattered boulder field means individual blocks vary widely in drying state.
- The open moorland setting at 215m provides decent wind exposure on the main buttress but sheltered boulders in hollows will dry much more slowly.
- The SE/S aspect of the main crag catches good afternoon sun, and today's forecast shows humidity dropping to 52-55% in the afternoon with clearing skies — the best drying window is mid-afternoon onwards.
Warnings
2
- Do not assume the rock is dry just because the surface feels dry — Millstone Grit can retain damaging internal moisture well beyond surface drying, especially after 6.5mm of rain only 1.5 days ago.
- Check the ground at the base of boulders: if the soil or vegetation is still damp, the rock above is very likely still wet internally.
Reasoning
With 6.5mm on August 4th and 0.5mm on the 5th, the rock has had only ~1.5 days of drying; internal moisture is likely still present in thicker blocks and north-facing surfaces despite possible surface drying on exposed south-facing faces.
Strong westerly/south-westerly winds (25-34 km/h) and the SE/S aspect are accelerating surface drying, but persistently high humidity (82% average over the past week) is limiting evaporative efficiency, making the ~36-hour drying window marginal for full internal drying after 6.5mm of rain.
Moderate risk — the 6.5mm event was not extreme but internal saturation above 1% can still weaken Millstone Grit; thicker blocks and seepage zones may retain enough moisture to compromise hold integrity.
Mid-summer conditions are broadly favourable with temperatures around 15-17°C and long daylight hours, though the recent spell has been cooler and more humid than typical summer, slowing drying rates.
Contributing Factors
6
6.5mm fell on August 4th with a further 0.5mm on the 5th, providing only ~1.5 dry days against a recommended 48-hour minimum for this volume.
Sustained 33+ km/h westerly winds today are significantly accelerating surface evaporation across exposed faces.
The south-facing main buttress receives good afternoon solar radiation, and today's cloud is breaking up through the afternoon to allow direct sun.
Average humidity over the past week has been 82%, limiting the rate at which internal moisture can evaporate even when surface conditions feel dry.
Humidity drops to 52-55% between 14:00-17:00 today with partial clearing, creating the best drying conditions of the day.
The scattered boulder field means individual blocks face different directions and have different shelter profiles, so conditions will vary widely across the venue.
Recommendations
3
- If visiting today, focus only on south-facing, well-exposed surfaces on the main buttress during the afternoon drying window (14:00-18:00) and perform a thorough touch test on every hold before committing.
- Avoid north-facing, shady, or sheltered boulders entirely — these will not have had sufficient drying time after the August 4th rain.
- Tomorrow (August 8th) with forecast dry weather and lower humidity offers a much better prospect; waiting one more day significantly reduces risk of climbing on internally damp grit.
Do Not Climb
90%
11 days ago
Rothley Crag received ~4mm of rain overnight and into midday today, and the rock will still be saturated. Even though the afternoon looks dry, there has been insufficient drying time for this porous Millstone Grit to be safe to climb.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley's scattered boulders have varying aspects — south-facing exposed boulders dry significantly faster than shady or north-facing ones, as confirmed by local condition reports.
- The open moorland setting at 215m means the crag benefits from wind exposure, but recent NE and E winds have been less effective at drying the SE/S-facing rock surfaces.
- Millstone Grit here has coarser grain structure than nearby Fell Sandstone venues, with different porosity — it can absorb water rapidly but still requires the same conservative drying periods.
- The scattered boulder field means seepage and ground moisture vary considerably between problems; check the base of each boulder for dampness before assuming it's dry.
Warnings
2
- Climbing on wet Millstone Grit causes permanent hold damage — even if the surface appears dry this afternoon, the interior will still be saturated from today's 4mm of rain.
- The forecast shows further rain on Aug 5, 7, 8, and 9, making sustained drying unlikely this week.
Reasoning
The rock received 4mm of rain today (mostly overnight through midday), on top of intermittent light showers over the past week (0.2mm on Aug 3, 0.1mm on Aug 1, 0.1mm on Jul 31), meaning the rock is currently wet and internally saturated.
With rain falling as recently as midday today and humidity at 88-99% through the morning, there has been zero meaningful drying time; the SE/S aspect and moderate wind will help once conditions clear, but at least 24-48 hours of dry weather is needed after this rain.
Millstone Grit loses significant compressive strength when wet — climbing now risks hold breakage and permanent damage to the boulder problems, with strength loss beginning at just 1% saturation.
Summer temperatures (~15-22°C) and longer days are favourable for drying, but the recent pattern of repeated light showers and elevated humidity (averaging 81% over the past week) has prevented the rock from fully drying out between rain events.
Contributing Factors
6
Approximately 4mm of rain fell between midnight and noon today, directly wetting the rock surface and saturating the porous gritstone.
Small amounts of precipitation on Aug 3 (0.2mm), Aug 1 (0.1mm), Jul 31 (0.1mm), and Jul 28 (1.5mm) have kept internal moisture levels elevated, preventing thorough drying.
Average humidity over the past week has been 81%, with today peaking at 99%, severely limiting evaporative drying from the rock surface.
Temperatures of 15-22°C are reasonable for drying, and the SE/S aspect will receive solar radiation once cloud clears.
Winds of 13-21 km/h from the south today will assist surface drying once rain stops, though deeper moisture will persist.
A further 1.9mm is forecast for Aug 5, which will re-wet any surface drying achieved this afternoon and evening.
Recommendations
3
- Do not climb today — the rock is wet from this morning's rain and will not have dried sufficiently by afternoon despite clearing skies.
- The earliest realistic window is August 6 afternoon, but only if the forecast stays dry and you visually confirm each boulder is dry before climbing.
- Check the base of boulders and feel the rock surface carefully — if the ground is moist beneath the crag, the rock is still holding internal moisture.
Do Not Climb
45%
12 days ago
Light but frequent rain over the past week (2.6mm across several days including 0.9mm today) has kept the rock periodically wetted, and heavy rain (11.6mm) is forecast for tomorrow — conditions are not suitable for climbing today and will worsen significantly over the coming days. The sporadic nature of recent precipitation means the rock has not had a sustained dry window to fully dry out internally.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley's SE/S aspect and open moorland setting normally aid drying, but the persistent cloud cover (100% for most of today) and high humidity (80%+ average this week) are significantly reducing solar drying effectiveness.
- Scattered boulders at this venue dry at different rates — south-facing exposed boulders will dry first, while north-facing and shady boulders (e.g. Gloom area) can remain damp for days longer, as noted in condition reports.
- The Millstone Grit here has different porosity from the Fell Sandstone at nearby venues — it is coarser-grained but still porous and must not be climbed wet; the same ethical standards apply.
- At 215m altitude on open moorland, overnight temperatures have been dropping to 7–9°C recently, which slows evaporation during the long overnight hours when humidity peaks above 90%.
Warnings
2
- Heavy rain (11.6mm) forecast for August 4 will fully saturate the Millstone Grit; do not climb for at least 48 hours after this event.
- Surface-dry appearance is misleading on Millstone Grit — internal moisture from repeated recent wettings can persist and cause hold breakage on this irreplaceable bouldering venue.
Reasoning
The rock has received small but repeated wettings (0.9mm today, 0.1mm yesterday, 0.1mm July 31, 1.5mm July 28, 4.4mm July 26) with no sustained multi-day dry spell, meaning internal moisture levels have been repeatedly topped up and the rock has not had adequate time to dry fully.
Despite the SE/S aspect which normally aids drying, persistent high humidity (80% average), 100% cloud cover today, and light easterly winds (which do not directly ventilate a SE/S-facing crag as effectively) have limited drying potential — the last genuinely good drying window was July 29–30 but was interrupted by trace rain on July 31.
Repeated wetting without full drying cycles means the Millstone Grit likely retains significant internal moisture, posing a real risk of grain loosening and hold breakage even where surfaces appear dry.
Mid-summer temperatures (15–20°C) are helpful for evaporation in principle, but the current unsettled spell with high humidity and frequent light rain is negating much of the seasonal advantage.
Contributing Factors
6
Multiple light rain events over the past week (0.9mm today, plus rain on Aug 1, Jul 31, Jul 28, Jul 27, Jul 26) have kept the rock periodically wetted with no sustained 48-hour dry window.
Average humidity of 80% over the last 7 days significantly impedes evaporation from the rock surface.
11.6mm of rain forecast for August 4 will thoroughly re-saturate the rock, resetting any drying progress.
The south-facing aspect would normally aid drying, but 100% cloud cover today and overcast conditions this week have largely negated this advantage.
Winds of 20–23 km/h this afternoon provide some drying assistance, though the easterly direction is less effective for SE/S-facing rock.
The longest fully dry spell in the past week was only about 4 days (Jul 29–Aug 1), interrupted by trace amounts, which is marginal for full internal drying of porous Millstone Grit.
Recommendations
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- Do not climb today — the rock has been repeatedly wetted this week and has not had an adequate sustained drying window, despite possible surface dryness this afternoon.
- Avoid visiting tomorrow (August 4) entirely as 11.6mm of heavy rain is forecast, which will thoroughly saturate the rock.
- Monitor conditions from mid-week onwards, but note that further light rain is forecast through August 8 — a reliable climbing window is unlikely until a sustained 48+ hour dry spell with lower humidity materialises.
Climbing Outlook