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Rule Morning Frost

Gordale Scar - Morning Frost - Yorkshire Dales

Malham, 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 51% failing

Currently

Real-time conditions
Soil Temperature12.5°C
Dew Point12.0°C (moderate dew point)
Wind Speed3.6m/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 freezing conditions create photogenic frost patterns across the Yorkshire Dales' distinctive limestone landscape. We track overnight temperatures, humidity, clear skies, and wind conditions to predict when hoar frost transforms waterfalls, stone walls, and limestone formations.

The Dales' elevation and northern position mean frost conditions are common from November through March. Freezing temperatures transform the region's numerous waterfalls into ice sculptures, while hoar frost decorates limestone pavements and thousands of miles of dry-stone walls with intricate crystal patterns.

What makes Yorkshire Dales frost photography special:

  • Frozen waterfalls - Aysgarth Falls and Hardraw Force develop dramatic ice formations in extended freezes
  • Limestone patterns - Hoar frost accentuates the geometric clints and grikes of limestone pavements
  • Stone wall networks - Miles of traditional walls become white geometric patterns across frozen hillsides
  • Historic barns - Field barns and traditional stone buildings gain fairy-tale quality under heavy frost

Aysgarth Falls' triple cascades develop stunning ice formations during prolonged freezes, with water still flowing beneath frozen edges. Hardraw Force—England's highest single-drop waterfall—creates an amphitheater of ice when temperatures stay below freezing for days. The limestone pavement at Malham becomes even more geometric under hoar frost, with ice crystals following the rock's natural patterns. Traditional field barns scattered across high pastures gain storybook quality when frost-covered under blue winter skies. Bolton Abbey's medieval priory ruins take on Gothic atmosphere when frost-covered. Stone walls create endless compositional opportunities—their geometric patterns emphasized by frost against dark winter grass. Dawn light is crucial—arrive early to catch low sun illuminating frost crystals before they melt. Cold, clear nights with high pressure produce the heaviest frost.

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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
Sun, May 24
05:000%0.86m/s
06:000%0.72m/s
07:000%0.62m/s
08:000%1.3m/s
09:000%2m/s
10:000%2.2m/s
11:000%2.5m/s
12:000%2.9m/s
13:000%3.3m/s
14:000%3.6m/s
15:000%3.6m/s
16:000%3.2m/s
17:000%2.8m/s
18:000%2.2m/s
19:000%1.3m/s
20:000%1.1m/s
21:000%1m/s
22:000%0.7m/s
23:000%0.73m/s
Mon, May 25
24:000%0.64m/s
01:000%0.6m/s
02:000%0.28m/s
03:000%0.14m/s
04:000%0.29m/s
05:000%0.26m/s
06:000%0.23m/s
07:000%0.2m/s
08:000%0.79m/s
09:000%1.2m/s
10:000%1.6m/s
11:000%1.8m/s
12:000%2.4m/s
13:000%2.9m/s
14:000%3.1m/s
15:000%3.1m/s
16:000%2.7m/s
17:000%1.9m/s
18:000%1.6m/s
19:000%1.7m/s
20:000%1.5m/s
21:000%1m/s
22:000%0.45m/s
23:000%0.74m/s
Tue, May 26
24:000%0.57m/s
01:000%0.43m/s
02:000%0.65m/s
03:000%0.62m/s
04:000%0.71m/s
05:000%0.74m/s
06:000%0.69m/s
07:000%0.52m/s
08:000%0.58m/s
09:000%0.59m/s
10:000%0.66m/s
11:000%0.64m/s
12:000%0.51m/s
13:000%0.24m/s
14:000%0.09m/s
15:000%0.41m/s
16:000%0.94m/s
17:000%2.3m/s
18:000%4.8m/s
19:000%5m/s
20:000%4.4m/s
21:000%3.9m/s
22:000%3.3m/s
23:000%3.2m/s
Wed, May 27
24:000%3.1m/s
01:000%3m/s
02:000%3m/s
03:000%3.1m/s
04:000%3.1m/s
05:000%3.6m/s
06:000%4.1m/s
07:000%4.7m/s
08:000%4.7m/s
09:000%4.8m/s
10:000%4.9m/s
11:000%4.7m/s
12:000%4.4m/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
Sun, May 24 Sunrise 04:52 Sunset 21:19
14:00
12°C 12°C 19°C - 5% 0.77kPa
15:00
12°C 13°C 19°C - 5% 0.86kPa
16:00
11°C 13°C 19°C - 5% 0.92kPa
17:00
11°C 13°C 19°C - 5% 0.91kPa
18:00
11°C 13°C 18°C - 5% 0.81kPa
19:00
12°C 13°C 18°C - 5% 0.61kPa
20:00
11°C 13°C 16°C - 3% 0.46kPa
21:00
8.9°C 13°C 13°C - 0% 0.33kPa
22:00
7.5°C 13°C 11°C - 0% 0.3kPa
23:00
6.7°C 13°C 11°C - 0% 0.31kPa
Mon, May 25 Sunrise 04:52 Sunset 21:19
24:00
5.7°C 13°C 11°C - 0% 0.36kPa
01:00
5.1°C 12°C 11°C - 0% 0.39kPa
02:00
4.5°C 12°C 10°C - 0% 0.42kPa
03:00
4.1°C 12°C 10°C - 0% 0.44kPa
04:00
3.8°C 12°C 10°C - 0% 0.45kPa
05:00
3.5°C 12°C 10°C - 0% 0.45kPa
06:00
5.5°C 11°C 11°C - 0% 0.44kPa
07:00
8.3°C 11°C 14°C - 0% 0.53kPa
08:00
9.3°C 12°C 16°C - 0% 0.65kPa
09:00
11°C 12°C 18°C - 0% 0.72kPa
10:00
12°C 12°C 19°C - 0% 0.81kPa
11:00
13°C 12°C 21°C - 0% 0.94kPa
12:00
14°C 13°C 22°C - 0% 1kPa
13:00
14°C 13°C 23°C - 0% 1.1kPa
14:00
15°C 13°C 23°C - 0% 1.1kPa
15:00
16°C 14°C 24°C - 0% 1.1kPa
16:00
16°C 14°C 24°C - 0% 1.1kPa
17:00
16°C 14°C 24°C - 0% 1.1kPa
18:00
17°C 15°C 24°C - 0% 1kPa
19:00
18°C 15°C 23°C - 0% 0.66kPa
20:00
17°C 15°C 21°C - 0% 0.49kPa
21:00
15°C 15°C 18°C - 0% 0.34kPa
22:00
14°C 15°C 17°C - 0% 0.34kPa
23:00
13°C 15°C 16°C - 3% 0.36kPa
Tue, May 26 Sunrise 04:51 Sunset 21:20
24:00
13°C 15°C 16°C - 2% 0.34kPa
01:00
13°C 15°C 16°C - 2% 0.31kPa
02:00
12°C 15°C 15°C - 5% 0.3kPa
03:00
12°C 15°C 15°C - 5% 0.3kPa
04:00
12°C 14°C 15°C - 5% 0.3kPa
05:00
12°C 14°C 15°C - 5% 0.3kPa
06:00
13°C 14°C 16°C - 3% 0.32kPa
07:00
15°C 14°C 18°C - 3% 0.41kPa
08:00
15°C 14°C 19°C - 5% 0.51kPa
09:00
16°C 15°C 21°C - 7% 0.61kPa
10:00
17°C 15°C 22°C - 5% 0.73kPa
11:00
18°C 15°C 23°C - 17% 0.82kPa
12:00
18°C 16°C 24°C - 45% 0.87kPa
13:00
18°C 16°C 24°C - 76% 0.93kPa
14:00
18°C 16°C 24°C - 79% 0.93kPa
15:00
18°C 17°C 24°C - 90% 0.91kPa
16:00
18°C 17°C 24°C - 73% 0.89kPa
17:00
19°C 17°C 23°C - 60% 0.75kPa
18:00
19°C 17°C 21°C - 78% 0.37kPa
19:00
17°C 17°C 19°C - 81% 0.17kPa
20:00
14°C 16°C 16°C - 87% 0.22kPa
21:00
10°C 16°C 13°C - 94% 0.25kPa
22:00
6.7°C 15°C 10°C - 100% 0.26kPa
23:00
6.7°C 14°C 10°C - 100% 0.27kPa
Wed, May 27 Sunrise 04:49 Sunset 21:22
24:00
6.7°C 14°C 10°C - 100% 0.29kPa
01:00
6.7°C 14°C 11°C - 100% 0.3kPa
02:00
6.8°C 14°C 11°C - 96% 0.32kPa
03:00
6.9°C 14°C 11°C - 92% 0.35kPa
04:00
7°C 14°C 12°C - 89% 0.37kPa
05:00
7.6°C 14°C 13°C - 92% 0.42kPa
06:00
8.1°C 14°C 14°C - 96% 0.47kPa
07:00
8.6°C 13°C 14°C - 100% 0.52kPa
08:00
8.9°C 14°C 15°C - 98% 0.54kPa
09:00
9.2°C 14°C 15°C - 97% 0.56kPa
10:00
9.4°C 14°C 16°C - 96% 0.58kPa
11:00
9.3°C 14°C 15°C - 89% 0.54kPa
12:00
9.2°C 14°C 15°C - 83% 0.5kPa
13:00
9.1°C 14°C 14°C - 77% 0.47kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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