Condition Analysis
AI-powered assessment using site data and 14-day weather history
The last significant rain was 6.0mm on August 19th, followed by 2.4mm on August 20th, giving roughly 5–6 dry days before light drizzle (0.7mm) on August 25th and a trace today. The SE/S aspect and moderate winds have aided drying, but humidity has been persistently high (83% average over the past week), and a major storm front (25.9mm) arrives tomorrow, making today the only realistic window — and conditions should be visually verified on arrival.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley is Millstone Grit rather than Fell Sandstone, giving a coarser texture with slightly different porosity — it can feel surface-dry while retaining internal moisture differently from typical Northumberland venues.
- The scattered boulder field means individual blocks dry at different rates: south-facing exposed boulders dry fastest, while shady or north-facing blocks (e.g. 'Gloom') can remain damp far longer, as condition reports confirm.
- Open moorland setting at 215m means overnight dew and condensation are common when humidity exceeds 90%, which has been the case most recent mornings — rock surfaces may be dew-wet until late morning.
- A massive rain event (25.9mm) is forecast for tomorrow followed by several more wet days, meaning today is the last viable window for potentially a week or more.
Warnings
2
- Heavy rain of 25.9mm is forecast for tomorrow (Aug 27), with further significant rain on Aug 28–30 totalling ~45mm — the crag will be completely unsuitable for climbing for several days after this clears.
- Overnight humidity near 97% means dew-wetted surfaces are likely until late morning — do not climb on visibly damp rock even if rain has not fallen.
Reasoning
The 6.0mm on Aug 19 and 2.4mm on Aug 20 have had 5–6 days of broadly dry weather to evaporate, but persistent high humidity (78–85%) and light precipitation on Aug 25 (0.7mm) and a trace today mean the rock may not be fully dry internally, particularly on shaded faces.
The SE/S aspect and moderate westerly winds over the past few days have been helpful, and temperatures in the mid-to-high teens provide reasonable evaporation potential, but overnight humidity consistently near or above 95% means dew formation is re-wetting surfaces each morning, slowing net drying.
Structural risk is moderate — the rock has had several days to dry from the Aug 19–20 rain, reducing internal saturation below critical thresholds, but the light recent moisture and high humidity mean some internal dampness likely persists in less-exposed blocks.
Mid-to-late August is generally a good period for climbing, but this particular week has seen below-average temperatures and above-average humidity for summer, reducing drying efficiency compared to the warm spell of Aug 11–14.
Contributing Factors
6
6.0mm on Aug 19 and 2.4mm on Aug 20 required substantial drying time, and light precipitation on Aug 25 (0.7mm) and today's trace have interrupted the drying window.
Aug 21–24 were dry with reasonable temperatures (14–18°C) and moderate winds, providing roughly four consecutive dry days for evaporation after the Aug 19–20 rain.
Average humidity of 83% over the past week, with overnight values consistently above 93%, significantly slows evaporation and causes dew formation that re-wets rock surfaces each morning.
The south to south-east facing aspect catches good afternoon sun, which accelerates surface and near-surface drying on exposed boulders.
25.9mm forecast for Aug 27 followed by further rain on Aug 28–30 will thoroughly saturate the rock, making today the last possible window before an extended wet spell.
Winds of 10–20 km/h from westerly and easterly directions have helped move moist air from rock surfaces, aiding drying despite the high ambient humidity.
Recommendations
3
- If visiting today, go in the afternoon (after 12:00) when surface dew has evaporated and humidity drops to its daily minimum around 74%, and focus exclusively on south-facing, sun-exposed boulders.
- Perform a touch test on every boulder before climbing — if the rock feels cool or tacky, or if the ground at the base is damp, move on to a more exposed block or do not climb.
- Do not plan any climbing from tomorrow (Aug 27) through at least Sep 1 — the incoming 45mm of rain will require a minimum of 48–72 hours of dry weather afterwards before conditions recover.
Previous Analyses
Likely Safe to Climb
82%
57 days ago
Four consecutive dry days with moderate temperatures and decent wind have followed the last significant rain on 20 August (2.4mm). The SE/S aspect and summer sun have provided good drying conditions, and today's low humidity afternoon (52–56%) with clear skies should complete surface and internal drying on exposed faces. Rain is forecast from tomorrow, so today represents the best window.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The crag's Millstone Grit is coarser-grained than typical Fell Sandstone, with different porosity — it may shed water slightly differently but remains fully porous and must be treated with the same caution.
- SE/S facing aspect catches excellent summer sun from mid-morning onwards, significantly accelerating drying on the main buttress; however, any north-facing or shaded scattered boulders (e.g. 'Gloom' area noted in condition reports) will dry much more slowly.
- Open moorland setting at 215m provides reasonable wind exposure which aids drying, though easterly winds today are less effective on the SE/S faces than the prevailing westerlies.
- A prolonged wet spell from 16–20 August deposited ~17.5mm across five days; while four dry days have followed, lower or sheltered boulders may retain some residual moisture.
Warnings
1
- Rain is forecast from tomorrow through at least 29 August — conditions will deteriorate significantly and the crag will likely be out of condition for a week or more.
Reasoning
The last meaningful rain was 2.4mm on 20 August, preceded by a wet cluster totalling ~17.5mm from 16–20 August; four dry days since then with moderate temperatures (14–18°C) and humidity dropping to 74–78% should have allowed well-exposed SE/S faces to dry adequately.
Four full dry days with summer sun on the SE/S aspect, moderate westerly-to-northwesterly winds (11–19 km/h), and today's particularly good afternoon conditions (humidity 52%, clear skies, 18°C) provide strong drying — comfortably meeting the 48–72 hour guideline for the moderate rainfall amounts involved.
Internal moisture from the 16–20 August wet spell should be largely evaporated from sun-exposed faces after four days of summer drying, though shaded or north-facing boulders carry a residual risk of retained moisture.
Mid-to-late August offers long daylight hours, warm temperatures, and no freeze-thaw risk, making this the most favourable season for drying porous rock.
Contributing Factors
6
No rain since 20 August gives approximately 96+ hours of drying time, comfortably exceeding the two-day minimum guideline for moderate rainfall.
The south-facing orientation receives strong solar radiation through the long August days, driving evaporation from exposed rock faces.
Humidity drops to 52–56% this afternoon with clear skies, providing excellent evaporative conditions for any residual surface moisture.
A cluster of rain events totalling ~17.5mm over five days means the rock absorbed a meaningful amount of water that requires thorough drying.
Today's easterly wind is less effective at drying the SE/S faces than the prevailing westerlies, though partial exposure still provides some benefit.
3.8mm forecast for 25 August followed by further heavy rain through the week means today is the last viable climbing window for some time.
Recommendations
3
- Climb today — this is the best window before a prolonged wet spell arrives tomorrow; prioritise the afternoon when humidity is lowest and sun has been on the rock.
- Stick to the main south-facing buttress and sun-exposed boulders; avoid any north-facing, shaded, or low-lying boulders where moisture may linger.
- Perform a touch test on holds before committing — if any dampness is detected, especially on lower sections or recessed features, back off immediately.
Marginal — Assess Conditions
70%
58 days ago
Three consecutive dry days with moderate temperatures and decent wind following a wet spell (6mm on Aug 19, 2.4mm on Aug 20) suggest the SE/S-facing Millstone Grit should be approaching climbable condition, but humidity has remained high (averaging 83% over the last week) which slows drying. A visual and touch assessment on arrival is strongly recommended before committing to climb.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Millstone Grit at Rothley has coarser grain and different porosity to Fell Sandstone — it may shed surface moisture slightly differently, but internal saturation risks remain the same.
- The scattered boulder layout means some blocks are more sheltered than others; south-facing exposed boulders (e.g. Arête Land area) dry significantly faster than north-facing or shaded ones (e.g. Gloom).
- Open moorland setting at 215m means temperatures run cooler than lowland venues, and easterly winds forecast from Aug 25 onward will not benefit this SE/S-facing aspect as effectively as the recent westerlies.
- Heavy rain is forecast for Aug 27–28 (36mm+), which will reset drying completely — today and tomorrow represent a brief window before conditions deteriorate sharply.
Warnings
2
- A major rain event (36mm+) is forecast for Aug 27–28 — do not attempt to climb during or shortly after this period; expect the crag to need 3–5 days of dry weather to recover.
- North-facing and sheltered boulders may still be damp internally despite 3 dry days — stick to sun-exposed south-facing problems only.
Reasoning
The last significant rain was 6.0mm on Aug 19 followed by 2.4mm on Aug 20, giving approximately 3 full dry days by today (Aug 23); surface rock on south-facing aspects should be dry, but internal moisture from the preceding wet spell (15.7mm in 7 days) may linger in sheltered blocks.
Three dry days with moderate westerly winds (10–19 km/h), temperatures around 14–18°C, and SE/S aspect receiving good summer sun provide reasonable but not ideal drying conditions given persistently high humidity (74–84%).
Millstone Grit is porous and loses significant compressive strength when wet; with 3 days of drying in summer conditions the main south-facing buttress should have recovered structural integrity, though sheltered or north-facing boulders remain at risk.
Mid-to-late August provides reasonable day length and solar angle for drying south-facing rock, though recent below-average temperatures (~13–18°C) and elevated humidity have slowed the process compared to peak summer conditions.
Contributing Factors
6
No measurable precipitation since Aug 20 (2.4mm), providing a 72+ hour drying window which meets the minimum threshold for light-to-moderate rain in summer.
Average humidity over the last 7 days is 83%, significantly limiting evaporative drying potential despite otherwise reasonable temperatures.
The south-facing aspect receives strong solar radiation in August, substantially aiding surface and subsurface drying on exposed faces.
15.7mm fell in the 7 days before the dry window began (including 6.9mm on Aug 17 and 6.0mm on Aug 19), meaning the rock was well-saturated before drying commenced.
Westerly winds of 10–20 km/h over the dry period help move moist air from the rock surface, aiding evaporation on exposed faces.
Over 36mm of rain is forecast for Aug 27–28 with near-100% humidity, which will completely reset drying and render the crag unsafe for several days afterward.
Recommendations
3
- Prioritise the main south-facing buttress and sun-exposed boulders; avoid any north-facing, shaded, or low-lying blocks which may still hold internal moisture.
- Perform a tactile check on the rock surface and inspect the ground at the base of boulders — if the soil is damp, the rock likely retains internal moisture.
- If planning to visit this week, go today or tomorrow (Aug 23–24) as the heavy rain forecast for Aug 27–28 will close the current dry window entirely.
Do Not Climb
45%
59 days ago
The crag received significant rain recently — 6.0mm on Aug 19 and 2.4mm on Aug 20 — followed by only two dry days with moderate temperatures, high humidity (84% average last 7 days), and light winds. While the SE/S aspect helps, internal moisture is likely still present in this porous Millstone Grit, and rain is forecast again tomorrow.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley's Millstone Grit is coarser than typical Fell Sandstone but remains highly porous — it must not be climbed wet and drying behaviour may differ slightly from finer-grained venues.
- Historical condition reports confirm that north-facing and shaded boulders dry significantly slower than the sun-facing exposed ones, even after extended dry spells.
- The scattered boulder layout means individual blocks dry at very different rates depending on their aspect, size, and whether they sit in sheltered hollows or on exposed moorland.
- Open moorland at 215m can hold ground moisture after wet spells, and the base-of-rock ground moisture test is a useful indicator here — if the heather and ground at the base are damp, the rock likely is too.
Warnings
2
- Millstone Grit can appear surface-dry while retaining damaging levels of internal moisture — do not trust surface appearance alone after recent heavy rain.
- Climbing on damp gritstone risks permanent hold breakage and route degradation at this National Trust-managed site.
Reasoning
With 6.0mm on Aug 19 and 2.4mm on Aug 20 totalling 8.4mm in two days, followed by only two dry days with high ambient humidity (~84%), internal moisture is very likely still present in the porous Millstone Grit.
The SE/S aspect provides reasonable solar input but light winds (12–19 km/h) and persistent high humidity (74–84%) have limited evaporative drying; two days is insufficient to confidently dry 8+ mm of rain from porous gritstone.
Millstone Grit loses significant compressive strength when internally damp — with only two days of marginal drying conditions, hold breakage and grain loosening remain a real risk.
Mid-to-late August offers adequate daylight hours and reasonable temperatures for drying, but the recent cool spell (avg 12.7°C over 7 days) and persistent humidity have underperformed typical summer drying.
Contributing Factors
7
8.4mm fell across Aug 19–20, with additional light rain on Aug 17 (6.9mm) and Aug 18 (0.4mm), giving a wet 4-day period totalling over 15mm.
Just two full dry days (Aug 21–22) is below the recommended minimum of 48–72+ hours of good drying conditions after heavy rain on porous rock.
Average humidity of 84% over the last 7 days severely limits evaporative drying, even with some sun and wind.
The south-facing aspect receives good solar radiation which aids surface and near-surface drying on exposed boulders.
Open moorland setting provides partial wind exposure that assists drying, though recent wind speeds have been modest (12–19 km/h).
2.2mm forecast for Aug 23 will reset any drying progress, followed by further rain on Aug 25, 26, and 27.
Average temperature of 12.7°C over the last week is below-par for late August and slows evaporation rates.
Recommendations
3
- Do not climb today — two days of mediocre drying after 15mm+ of rain over four days is insufficient for porous Millstone Grit.
- The upcoming forecast shows repeated rain through to Aug 27; monitor conditions and look for a 48–72 hour dry window with lower humidity before visiting.
- If visiting, use the ground moisture test: if the heather and soil at the base of boulders are damp, the rock is almost certainly still wet internally.
Do Not Climb
40%
60 days ago
The last significant rain was 6.0mm on August 19 followed by 2.4mm on August 20, with only one full dry day elapsed (today, August 21). Given the high humidity (83–88%) and modest temperatures over recent days, the Millstone Grit is very likely still holding internal moisture despite a dry surface, and conditions are not yet reliable for climbing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley's SE/S aspect will help drying from tomorrow as winds shift NW/W and humidity drops, but the recent rain on Aug 17 (6.9mm), 19 (6.0mm) and 20 (2.4mm) means cumulative saturation is still significant.
- Condition reports from spring confirm that north-facing and shady boulders at Rothley dry much more slowly — the scattered boulder field means individual blocks vary enormously in drying speed depending on aspect and shelter.
- Millstone Grit's coarser grain structure may allow slightly faster surface drainage than Fell Sandstone but internal porosity still demands full drying time — the same ethical standards apply.
- Open moorland setting at 215m means cooler temperatures and persistent ground moisture; if the heather and peat at the crag base are damp, the rock almost certainly is too.
Warnings
2
- Do not climb today — only one dry day since significant rain and humidity remains very high; the rock is almost certainly still wet internally.
- Heavy rain (13.8mm) is forecast for August 26, which will reset drying entirely — any climbing window is limited to Aug 23–25 at best.
Reasoning
With 6.0mm on Aug 19 and 2.4mm on Aug 20, plus only one dry day at high humidity (83%), the rock is very likely still wet internally even if some sun-facing surfaces appear dry.
The SE/S aspect and moderate wind (~20 km/h) today help surface drying, but only one dry day with 83% humidity and 13°C is far short of the 48–72 hours needed after cumulative recent rain totalling ~15mm over the past four days.
Climbing now risks hold breakage on internally saturated Millstone Grit, which loses up to 50% compressive strength when wet — the coarse grain structure is particularly vulnerable to grain loosening.
Mid-August conditions are generally favourable for drying, but the recent cool, humid spell with temperatures around 13–17°C and humidity consistently above 84% has significantly slowed evaporation.
Contributing Factors
6
A total of ~15mm fell across Aug 17–20 (6.9 + 0.4 + 6.0 + 2.4mm), with the most recent rain only yesterday, meaning the rock has had minimal drying time.
Just one full dry day has passed since the last rain on Aug 20, well short of the minimum 48–72 hours required after moderate rain on porous rock.
Humidity has averaged 84% over the last week and sits at 83% today, severely limiting evaporative drying potential.
The south-facing aspect and partial wind exposure provide above-average drying conditions when sun appears, which will help over the coming dry spell.
Average temps around 13–14°C over recent days are cool for mid-August, slowing evaporation rates compared to the warmer spell earlier in the month.
The next four days show no precipitation and declining humidity (72–78%), which should allow progressive drying of the rock.
Recommendations
3
- Wait at least until August 23 (two full dry days with lower humidity) before considering a visit, and even then assess conditions carefully on arrival.
- Check the peat and heather at the base of the boulders — if the ground is damp, the rock is almost certainly still wet internally.
- Prioritise the most sun-exposed, south-facing boulders first and avoid any north-facing or shaded blocks for longer still.
Do Not Climb
90%
61 days ago
Rothley Crag has received significant rainfall over the past few days (6.9mm on Aug 17, 5.7mm on Aug 19, and 3.7mm today) with persistent high humidity, and the rock will be thoroughly saturated. Even with the SE/S aspect, there has been no meaningful drying window since the last substantial rain, making conditions clearly unsuitable for climbing on this porous Millstone Grit.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Millstone Grit at Rothley has coarser grain structure than the Fell Sandstone found elsewhere in Northumberland, giving slightly different (but still slow) drying behaviour — it must not be climbed wet.
- Condition reports from spring confirm that even after several sunny days, north-facing and shaded boulders can remain damp while south-facing ones dry; the scattered boulder field means individual blocks dry at very different rates.
- At 215m on open moorland, the crag is exposed to wind which aids drying, but the northerly wind direction today and tomorrow means the SE/S-facing rock surfaces are sheltered from the prevailing airflow, reducing drying efficiency.
- The 28-day precipitation total of 34mm with repeated wetting events means the rock has had little opportunity to dry internally, even during the brief warm spell on Aug 11–13.
Warnings
2
- Climbing on wet Millstone Grit causes permanent damage through hold breakage and surface erosion — please wait for proper drying conditions.
- The rock surface may appear dry before the interior has dried sufficiently; check the ground at the crag base as a moisture indicator.
Reasoning
The rock is currently wet from today's 3.7mm of rain (falling steadily through the morning), following 5.7mm on Aug 19 and 6.9mm on Aug 17 — there has been no consecutive dry period to allow meaningful drying.
The last fully dry day was Aug 15, but 6.9mm fell on Aug 17 and further rain on Aug 18–20 means drying has been repeatedly interrupted; the northerly wind today shelters the south-facing rock faces, further slowing evaporation.
With repeated wetting over recent days and high humidity (83% average over the past week), the Millstone Grit will be saturated well beyond the 1% threshold where significant strength loss begins, posing real hold-breakage and surface-damage risk.
Mid-August temperatures are adequate for drying when dry weather arrives, but the current cool, humid spell (14°C average, 83% humidity) is limiting evaporative potential despite the summer season.
Contributing Factors
6
3.7mm of rain has fallen today, with showers through the morning until around 11:00, leaving all rock surfaces wet.
6.9mm on Aug 17, 0.4mm on Aug 18, 5.7mm on Aug 19, and 3.7mm today mean the rock has been repeatedly saturated with no drying window.
Average humidity of 83% over the past week severely limits evaporation rates even when rain is not falling.
Today's and tomorrow's northerly winds shelter the south/SE-facing rock surfaces from direct airflow, reducing the drying benefit of wind.
Temperatures of 14–17°C provide moderate evaporative potential once rain ceases, though well below the 20°C+ needed for rapid drying.
The exposed moorland setting means the crag is not shaded by trees, allowing whatever sun and wind is available to reach the rock.
Recommendations
3
- Do not climb today — the rock is actively wet and will remain so through the day despite the brief dry window this afternoon.
- The earliest realistic opportunity is Aug 23 if the forecast dry spell from Aug 22 holds and humidity drops, but visually inspect rock carefully and check the base of the crag for damp ground.
- Prioritise south-facing, exposed boulders first and avoid any shaded or north-facing blocks which will take significantly longer to dry.
Do Not Climb
55%
62 days ago
The rock received 6.9mm on August 17th, followed by light rain on the 18th and further light rain through today (Aug 19th), with no consecutive dry days yet accumulated. Although a drying window opens from late Aug 20th onward, the rock is currently too recently wet to climb safely on Millstone Grit.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley's SE/S aspect catches good afternoon sun which aids drying, but today's 100% cloud cover and high humidity (84%) are negating this advantage.
- The prominent main buttress will dry faster than scattered boulders sheltered by surrounding moorland vegetation — north-facing and shaded boulders will lag significantly.
- Millstone Grit's coarser grain structure may allow slightly faster surface drying than Fell Sandstone, but internal porosity still demands the same conservative drying times.
- Open moorland at 215m means the base of the crag can stay boggy after wet spells — if the ground is moist at the base, the rock is almost certainly still damp internally.
Warnings
2
- Millstone Grit loses significant compressive strength when wet — climbing on damp rock risks permanent hold breakage on this bouldering venue.
- The surface may appear dry while the interior remains saturated; use the ground-moisture test at the crag base as a proxy for internal rock condition.
Reasoning
With 6.9mm on Aug 17th, 0.4mm on Aug 18th, and ~1.6mm today (Aug 19th), the rock has had no meaningful drying period and is very likely saturated internally despite any surface drying.
Although the SE/S aspect is favourable and there has been moderate wind (20-25 km/h), persistent high humidity (80-88%) and cloud cover have severely limited evaporative drying since the last significant rain on Aug 17th.
At near-saturation levels, Millstone Grit faces 10-50% compressive strength reduction, making hold breakage a real risk on this bouldering venue where small holds are loaded intensely.
Mid-August temperatures (15-17°C) are adequate for drying but below the recent warm spell (26-29°C seen Aug 12-13), and the pattern has turned unsettled with repeated light rain events preventing cumulative drying.
Contributing Factors
6
6.9mm fell on August 17th followed by additional light rain on the 18th and 19th, keeping the rock in a repeatedly wetted state with zero consecutive dry days.
Average humidity over the last 7 days is 80% with today peaking at 96%, severely limiting evaporative drying from the rock surface.
Consecutive dry days stand at zero — the minimum 24-48 hour drying guideline for even light rain has not been met, let alone the 48-72+ hours needed after heavier rain.
The south-facing aspect would normally accelerate drying, but today's near-total cloud cover (80-100%) is preventing meaningful solar heating of the rock.
Winds of 19-25 km/h from the west provide some drying benefit at this partially exposed moorland site, though insufficient to overcome high humidity.
The last 7 days have seen 10.7mm spread across multiple events, meaning the rock has been repeatedly re-wetted before completing any drying cycle.
Recommendations
3
- Do not climb today — the rock has been repeatedly wetted and has had zero consecutive dry days to begin meaningful drying.
- The earliest realistic window opens on August 22nd after two full dry days with dropping humidity, but check the ground at the crag base before committing.
- If visiting from Aug 22nd onward, prioritise the prominent south-facing main buttress and wind-exposed boulders; avoid shaded or north-facing scattered boulders which will dry last.
Do Not Climb
90%
63 days ago
Rothley Crag has received approximately 13mm of rain over the past three days (Aug 16–18), including 5mm of heavy overnight rain today, and the rock will be saturated. With further rain forecast tomorrow and a major 17mm event on Aug 20, conditions are clearly unsuitable for climbing on this porous Millstone Grit.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley's SE/S aspect normally provides good solar drying, but 100% cloud cover today eliminates direct solar radiation, removing the crag's main drying advantage.
- Condition reports from spring confirm that even after several sunny days, north-facing and shady boulders at Rothley retain moisture — the scattered boulder layout means some blocks are partially sheltered and dry unevenly.
- The open moorland setting at 215m means the crag benefits from wind exposure, and today's moderate westerly (20–27 km/h) will assist surface drying, but this alone is insufficient to dry Millstone Grit that was soaked overnight.
- Millstone Grit's coarser grain structure and feldspar content give it slightly different porosity from Fell Sandstone, but it remains highly porous and loses significant strength when wet — the same strict drying ethics apply.
Warnings
2
- Climbing on saturated Millstone Grit risks permanent hold breakage and route damage — even if the surface feels merely damp, internal saturation causes 30%+ strength loss.
- A major 17mm rainfall event is forecast for Aug 20, which will fully resaturate the rock and reset any drying progress.
Reasoning
The rock is almost certainly saturated internally after 5mm of overnight rain today on top of 6.1mm yesterday and 1.8mm the day before, giving roughly 13mm over three days with no meaningful drying window between events.
Despite moderate westerly wind today and temperatures around 15–16°C, the 100% cloud cover, high morning humidity (87–99%), and the fact that rain only stopped a few hours ago mean virtually no effective drying has occurred — the rock surface may begin to feel less wet by afternoon but the interior will remain saturated.
With the rock likely at or near full saturation, compressive strength is reduced by 30%+ and climbing would risk hold breakage and permanent grain loosening on this porous Millstone Grit.
Mid-August should offer reasonable drying potential, but the current unsettled spell with below-average temperatures (15–17°C) and persistent cloud is performing more like an autumn pattern, slowing recovery significantly.
Contributing Factors
6
Approximately 13mm of rain over Aug 16–18 including 5mm overnight today has thoroughly saturated the porous Millstone Grit.
There have been no full dry days since the rain began on Aug 16, meaning no meaningful drying window has occurred.
100% cloud cover throughout today eliminates direct solar radiation on the SE/S aspect, removing the crag's primary drying mechanism.
Westerly winds of 20–27 km/h across the open moorland provide some surface drying assistance, though insufficient to dry saturated rock in hours.
A further 4.5mm is forecast tomorrow and 16.9mm on Aug 20, meaning conditions will worsen significantly before any recovery.
Average humidity of 78% over the past week and near-100% humidity overnight severely limits evaporative drying potential.
Recommendations
3
- Do not climb today — the rock is freshly wet and internally saturated after three days of intermittent rain.
- With 17mm forecast on Aug 20, do not plan to visit until at least Aug 23 at the earliest, and only then if conditions have genuinely dried.
- Check the ground at the base of the crag on arrival — if the soil or turf is damp, the rock is certainly still too wet to climb.
Do Not Climb
90%
64 days ago
Rothley Crag received 7mm of rain today with heavy showers forecast this evening (up to 5.7mm more from 19:00–23:00), and the coming days show continued rain through August 21st. The rock is actively wet and will not have any meaningful drying window in the near future.
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 still highly porous — it must not be climbed wet, and condition reports confirm north-facing and shaded boulders hold moisture much longer than the sun-exposed faces.
- The SE/S aspect normally aids drying, but the forecast shows northerly winds from Aug 20–21 which will not drive moisture off the south-facing surfaces efficiently.
- Open moorland setting means the base and surrounding ground will be saturated from cumulative recent rain (24.4mm in 28 days plus today's 7mm and forecast rain), providing a reliable field indicator — if the ground at the base is wet, the rock is too.
- Scattered boulder problems at varying heights and aspects will dry at very different rates; even when main buttress faces appear dry, lower and north-facing boulders can remain damp for days longer.
Warnings
2
- Climbing on wet Millstone Grit causes permanent hold breakage and irreversible route damage — the rock loses up to 50% of its compressive strength when saturated.
- Surface-dry appearance is deceptive on porous gritstone; internal moisture can persist long after the surface feels dry, especially after cumulative rain events like this.
Reasoning
The rock received 7mm today with additional heavy evening showers forecast, and prior rain on Aug 16 (1.8mm) and Aug 9 (1.7mm) means the rock has had no sustained dry spell — internal moisture levels will be high.
With only light winds today (averaging ~6 km/h) and high humidity (84% average, peaking at 99% this evening), there has been essentially no effective drying; the SE/S aspect provided some solar input mid-day but cloud cover was 78–100% through the afternoon.
Millstone Grit loses significant compressive strength when wet — with 7mm of rain today and no drying window, climbing now risks hold breakage and permanent damage to this porous rock.
Mid-August temperatures are moderate (16–18°C) which would normally support reasonable drying, but the persistent rainfall pattern and high humidity through the forecast period negate any seasonal advantage.
Contributing Factors
5
7mm recorded today with an additional ~5.7mm of heavy showers forecast from 19:00–23:00, thoroughly wetting the rock.
Rain is forecast on each of the next four days (Aug 18–21), totalling ~10mm, preventing any meaningful drying.
Humidity has averaged 77% over the past week and remains 79–93% through the forecast period, severely limiting evaporative drying.
Winds of 19–24 km/h from the west are forecast for coming days, which would normally help drying but are insufficient to overcome continuous re-wetting from rain.
The south-facing aspect would normally catch good summer sun, but heavy cloud cover (78–100%) today and in the forecast largely negates this advantage.
Recommendations
3
- Do not climb at Rothley Crag today or in the coming days — the rock is actively wet and further rain is forecast through August 21st.
- The earliest realistic window to assess conditions would be August 23rd or later, requiring at least 48 hours of dry weather after the last rain on August 21st.
- On arrival after a dry spell, check the ground at the base of the boulders — if the moorland turf is still soggy, the gritstone will still hold internal moisture.
Do Not Climb
70%
65 days ago
Today saw 1.9mm of rain and the forecast shows significant rainfall over the next three days (5.4mm, 4.6mm, and 9.9mm), making conditions unsuitable now and worsening through midweek. The preceding dry spell from August 10–15 had brought the rock into good condition, but that window has now closed.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Rothley is Millstone Grit rather than the Fell Sandstone typical of Northumberland — slightly coarser grain and different porosity mean drying behaviour may differ subtly, but the same ethical standards apply.
- The SE/S aspect catches good sun and the open moorland setting provides reasonable wind exposure, which together give above-average drying potential compared to sheltered or north-facing venues.
- Condition reports from spring confirm that north-facing and shady boulders retain moisture far longer than sun-exposed faces — the scattered boulder layout means individual blocks will vary significantly in condition.
- At 215m altitude on open moorland, temperatures run cooler than lowland venues, and the site is exposed to passing showers that may not register at nearby weather stations.
Warnings
2
- Millstone Grit loses significant strength when wet — surface-dry appearance after heavy rain does not mean the interior is dry; test by checking if the ground at the crag base is still moist.
- Nearly 20mm of rain is forecast over the next three days; do not be tempted to climb in brief dry spells between showers.
Reasoning
Today's 1.9mm of rain has wetted the rock surface, and with humidity at 83% there has been negligible drying since; the rock is currently damp.
The SE/S aspect and moderate wind exposure would normally allow reasonable drying, but the incoming rain tomorrow (5.4mm) and the following days means no meaningful drying window will open until at least August 20.
Millstone Grit loses significant compressive strength when wet, and climbing on damp rock risks grain loosening and permanent hold damage — the cumulative rainfall of ~22mm over the next few days will thoroughly saturate the rock.
Mid-August temperatures are moderate (15–18°C) and days are still reasonably long, which will aid drying once the rain stops, but no freeze-thaw risk exists at this time of year.
Contributing Factors
6
1.9mm fell today with 5.4mm, 4.6mm, and 9.9mm forecast over the next three days, totalling ~22mm of incoming precipitation.
Humidity is 83% today and forecast to reach 89% tomorrow, severely limiting evaporative drying.
The south-facing aspect will aid drying once the rain stops and skies clear, but this benefit is irrelevant while rain continues.
Partial wind exposure on open moorland helps move moist air away from rock surfaces, aiding drying once precipitation ceases.
A good 5-day dry spell (Aug 10–15) with warm temperatures had likely dried the rock well, but today's rain has reset the drying clock.
17.5mm over the past 28 days with sporadic light rain events means the rock has had intermittent wetting throughout the period.
Recommendations
3
- Do not climb today or over the next three days — the incoming rain will keep the rock saturated and climbing risks permanent damage to holds.
- The earliest realistic window is August 21, after at least one full dry day following the heavy rain on August 19; check conditions visually on arrival.
- If visiting August 21 or later, prioritise the most sun-exposed, south-facing boulders and avoid any blocks that are shaded, north-facing, or show damp patches at the base.
Climbing Outlook