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Rule Morning Frost

Castle Combe - Morning Frost - Cotswolds

Castle Combe, England, United Kingdom

Frost crystals on calm, cold mornings near sunrise

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Here’s what usually blocks matches

No Morning Frost opportunities in the next 14 days

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Rule requirements (key thresholds)
Time Window · Sunrise -45m to +90m Frost Probability · ≥ 60.0% Wind Speed · ≤ 1.5m/s

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)
Frost Probability 100% failing
Time Window 88% failing
Wind Speed 83% failing

Currently

Real-time conditions
Soil Temperature20.6°C
Dew Point12.8°C (moderate dew point)
Wind Speed1.9m/s (calm conditions)
Cloud Cover5%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

What this forecast looks for

Plain-language explanation from the rule

This forecast identifies when hard frost transforms the Cotswolds' honey-stone architecture and pastoral landscapes into crystalline winter wonderlands. We track overnight minimum temperatures, clear sky conditions, and ground frost risk to predict optimal frosted morning photography.

The Cotswolds' inland position and elevation (typically 200-330m) create reliable frost conditions during winter anticyclones. Clear skies and light winds allow radiative cooling to create heavy frost deposits on thatched roofs, dry stone walls, and riverside vegetation—all set against honey-colored Jurassic limestone that glows warmly against frozen foregrounds.

What makes Cotswolds frost photography distinctive:

  • Frosted thatch - Castle Combe's thatched cottages with heavy frost on golden stone—quintessentially English winter scenes
  • Arlington Row ice - Bibury's iconic weavers' cottages with frosted rooflines and icy River Coln creating mirror reflections
  • Frozen waterways - Bourton-on-the-Water's bridges with icy stream edges, Lower Slaughter's mill with frozen mill race
  • Churchyard frost - Painswick's famous 99 yew trees with frost-laden branches surrounding ancient gravestones

The most photogenic frost occurs during settled high pressure periods (December-February), particularly after clear, calm nights. Arlington Row at Bibury is England's most photographed village for good reason—frost on the 17th-century weavers' cottages creates magazine-cover compositions. Castle Combe's compact valley setting traps cold air, producing reliable frost that highlights its honey-stone cottages and medieval market cross. Arrive at first light while frost remains intact—winter sunrise around 8:00am gives time to scout compositions in pre-dawn light. The contrast between warm honey-stone and cold blue frost works beautifully in morning light.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 80 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Time Window
Sunrise -45m to +90m
Frost Probability
≥ 60.0%
Wind Speed
≤ 1.5m/s
Wed, Jul 8
05:000%1.2m/s
06:000%1.2m/s
07:000%1.4m/s
08:000%1.4m/s
09:000%1.3m/s
10:000%0.92m/s
11:000%0.55m/s
12:000%1.1m/s
13:000%1.5m/s
14:000%1.9m/s
15:000%2.8m/s
16:000%4.1m/s
17:000%5.3m/s
18:000%4.3m/s
19:000%4.3m/s
20:000%4.2m/s
21:000%3.3m/s
22:000%2.5m/s
23:000%2.2m/s
Thu, Jul 9
24:000%1.8m/s
01:000%1.9m/s
02:000%1.4m/s
03:000%1.3m/s
04:000%1.2m/s
05:000%1m/s
06:000%1.1m/s
07:000%1.1m/s
08:000%1.6m/s
09:000%2m/s
10:000%1.6m/s
11:000%0.78m/s
12:000%1.1m/s
13:000%1.3m/s
14:000%1.8m/s
15:000%2.7m/s
16:000%3.7m/s
17:000%4.4m/s
18:000%4m/s
19:000%3.5m/s
20:000%3.4m/s
21:000%3.5m/s
22:000%2.4m/s
23:000%1.9m/s
Fri, Jul 10
24:000%2.7m/s
01:000%3.4m/s
02:000%3m/s
03:000%2.5m/s
04:000%2.9m/s
05:000%3m/s
06:000%2.8m/s
07:000%2.6m/s
08:000%2.2m/s
09:000%1.5m/s
10:000%1.7m/s
11:000%2.1m/s
12:000%2.1m/s
13:000%1.4m/s
14:000%1.5m/s
15:000%2.3m/s
16:000%2.9m/s
17:000%3.2m/s
18:000%2.5m/s
19:000%3.1m/s
20:000%3m/s
21:000%2.8m/s
22:000%2.7m/s
23:000%3.2m/s
Sat, Jul 11
24:000%3.6m/s
01:000%4.1m/s
02:000%4.7m/s
03:000%5.2m/s
04:000%5.8m/s
05:000%5.8m/s
06:000%5.7m/s
07:000%5.7m/s
08:000%5.7m/s
09:000%5.8m/s
10:000%5.8m/s
11:000%6.1m/s
12:000%6.4m/s
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Frost Probability mean?

Inputs that drive the score

This derived score summarizes multiple raw weather signals. The table below shows the supporting inputs hour by hour, so you can see what's pushing the score up or down.

Time
Europe/London
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Wed, Jul 8 Sunrise 05:02 Sunset 21:25
14:00
13°C 21°C 30°C - 5% 2.9kPa
15:00
13°C 21°C 31°C - 5% 3kPa
16:00
13°C 21°C 31°C - 5% 3kPa
17:00
13°C 22°C 30°C - 5% 2.8kPa
18:00
13°C 22°C 30°C - 4% 2.7kPa
19:00
13°C 22°C 29°C - 1% 2.5kPa
20:00
14°C 22°C 26°C - 0% 1.8kPa
21:00
14°C 22°C 22°C - 0% 1kPa
22:00
14°C 22°C 19°C - 0% 0.63kPa
23:00
14°C 22°C 18°C - 5% 0.47kPa
Thu, Jul 9 Sunrise 05:02 Sunset 21:25
24:00
14°C 22°C 17°C - 5% 0.4kPa
01:00
14°C 21°C 17°C - 4% 0.36kPa
02:00
14°C 21°C 17°C - 5% 0.29kPa
03:00
14°C 21°C 16°C - 5% 0.24kPa
04:00
14°C 21°C 16°C - 5% 0.21kPa
05:00
14°C 20°C 15°C - 5% 0.2kPa
06:00
14°C 20°C 16°C - 5% 0.24kPa
07:00
15°C 20°C 19°C - 5% 0.48kPa
08:00
15°C 20°C 21°C - 5% 0.83kPa
09:00
15°C 20°C 23°C - 40% 1.2kPa
10:00
15°C 20°C 26°C - 5% 1.6kPa
11:00
14°C 21°C 28°C - 5% 2.2kPa
12:00
12°C 21°C 30°C - 5% 2.8kPa
13:00
11°C 22°C 31°C - 5% 3.2kPa
14:00
9.8°C 22°C 32°C - 5% 3.5kPa
15:00
9°C 22°C 32°C - 5% 3.7kPa
16:00
8.8°C 23°C 33°C - 5% 3.8kPa
17:00
8.4°C 23°C 32°C - 5% 3.7kPa
18:00
7.9°C 23°C 31°C - 5% 3.5kPa
19:00
7.5°C 24°C 31°C - 5% 3.3kPa
20:00
9.6°C 24°C 28°C - 9% 2.5kPa
21:00
11°C 24°C 23°C - 32% 1.6kPa
22:00
13°C 23°C 21°C - 7% 1kPa
23:00
13°C 23°C 19°C - 14% 0.76kPa
Fri, Jul 10 Sunrise 05:03 Sunset 21:24
24:00
12°C 23°C 19°C - 17% 0.85kPa
01:00
10°C 23°C 19°C - 70% 0.91kPa
02:00
9.8°C 22°C 17°C - 72% 0.74kPa
03:00
10°C 22°C 16°C - 82% 0.6kPa
04:00
11°C 22°C 16°C - 65% 0.49kPa
05:00
11°C 22°C 15°C - 9% 0.39kPa
06:00
12°C 21°C 16°C - 14% 0.4kPa
07:00
13°C 21°C 19°C - 40% 0.67kPa
08:00
13°C 21°C 22°C - 16% 1.1kPa
09:00
13°C 21°C 25°C - 5% 1.6kPa
10:00
13°C 21°C 27°C - 5% 2.1kPa
11:00
13°C 22°C 30°C - 5% 2.6kPa
12:00
13°C 22°C 32°C - 4% 3.1kPa
13:00
13°C 23°C 33°C - 4% 3.6kPa
14:00
11°C 23°C 34°C - 28% 4kPa
15:00
10°C 24°C 34°C - 11% 4.2kPa
16:00
9.5°C 24°C 35°C - 21% 4.3kPa
17:00
8.8°C 24°C 35°C - 8% 4.5kPa
18:00
8.2°C 25°C 35°C - 11% 4.4kPa
19:00
11°C 25°C 33°C - 79% 3.8kPa
20:00
14°C 24°C 28°C - 52% 2.1kPa
21:00
15°C 24°C 22°C - 26% 1.1kPa
22:00
13°C 23°C 17°C - 0% 0.4kPa
23:00
13°C 23°C 18°C - 2% 0.51kPa
Sat, Jul 11 Sunrise 05:04 Sunset 21:23
24:00
13°C 23°C 19°C - 4% 0.62kPa
01:00
13°C 22°C 19°C - 7% 0.75kPa
02:00
13°C 22°C 21°C - 5% 1kPa
03:00
13°C 22°C 23°C - 3% 1.4kPa
04:00
12°C 22°C 25°C - 2% 1.8kPa
05:00
12°C 23°C 27°C - 1% 2.2kPa
06:00
11°C 23°C 29°C - 1% 2.7kPa
07:00
9.2°C 23°C 31°C - 0% 3.2kPa
08:00
9°C 24°C 31°C - 0% 3.4kPa
09:00
8.8°C 24°C 32°C - 0% 3.5kPa
10:00
8.5°C 24°C 32°C - 0% 3.7kPa
11:00
8.3°C 24°C 32°C - 0% 3.6kPa
12:00
8.1°C 25°C 31°C - 0% 3.5kPa
13:00
7.9°C 25°C 31°C - 0% 3.4kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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