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Rule Morning Frost

Pen-y-ghent - Morning Frost - Yorkshire Dales

Horton in Ribblesdale, England, United Kingdom

Frost crystals on calm, cold mornings near sunrise

No opportunities right now
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 53% failing

Currently

Real-time conditions
Soil Temperature11.9°C
Dew Point11.6°C (moderate dew point)
Wind Speed3.8m/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 95 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
Sat, May 23
14:000%6m/s
15:000%5.6m/s
16:000%5.1m/s
17:000%4.8m/s
18:000%3.9m/s
19:000%2.9m/s
20:000%2.2m/s
21:000%2.1m/s
22:000%2m/s
23:000%1.9m/s
Sun, May 24
24:000%1.7m/s
01:000%1.6m/s
02:000%1.6m/s
03:000%1.5m/s
04:000%1.7m/s
05:000%1.7m/s
06:000%1.7m/s
07:000%1.7m/s
08:000%2m/s
09:000%2.2m/s
10:000%2.5m/s
11:000%3m/s
12:000%3.4m/s
13:000%3.7m/s
14:000%3.8m/s
15:000%3.8m/s
16:000%3.8m/s
17:000%3.4m/s
18:000%2.3m/s
19:000%1.7m/s
20:000%1.7m/s
21:000%1.4m/s
22:000%1.3m/s
23:000%1.1m/s
Mon, May 25
24:000%1m/s
01:000%1.1m/s
02:000%1.2m/s
03:000%1.2m/s
04:000%1.2m/s
05:000%1.2m/s
06:000%1.1m/s
07:000%1.2m/s
08:000%1.6m/s
09:000%2m/s
10:000%2.1m/s
11:000%2.3m/s
12:000%2.7m/s
13:000%3.5m/s
14:000%3.8m/s
15:000%3.8m/s
16:000%3.6m/s
17:000%2.3m/s
18:000%1.4m/s
19:000%0.97m/s
20:000%0.81m/s
21:000%0.75m/s
22:000%0.71m/s
23:000%0.7m/s
Tue, May 26
24:000%0.13m/s
01:000%0.47m/s
02:000%0.08m/s
03:000%0.34m/s
04:000%0.25m/s
05:000%0.15m/s
06:000%0.17m/s
07:000%0.43m/s
08:000%0.57m/s
09:000%0.47m/s
10:000%0.24m/s
11:000%0.57m/s
12:000%0.73m/s
13:000%0.26m/s
14:000%0.14m/s
15:000%0.5m/s
16:000%1.1m/s
17:000%2.7m/s
18:000%3.1m/s
19:000%3.1m/s
20:000%3.4m/s
21:000%3.6m/s
22:000%3.9m/s
23:000%3.7m/s
Wed, May 27
24:000%3.5m/s
01:000%3.2m/s
02:000%3.3m/s
03:000%3.5m/s
04:000%3.6m/s
05:000%4.1m/s
06:000%4.7m/s
07:000%5.3m/s
08:000%5.6m/s
09:000%5.9m/s
10:000%6.3m/s
11:000%6.1m/s
12:000%5.9m/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 21:20
14:00
12°C 12°C 18°C - 5% 0.63kPa
15:00
11°C 12°C 18°C - 5% 0.7kPa
16:00
9.7°C 12°C 18°C - 5% 0.79kPa
17:00
8.5°C 12°C 17°C - 5% 0.83kPa
18:00
8.1°C 13°C 17°C - 3% 0.81kPa
19:00
9.8°C 13°C 16°C - 4% 0.61kPa
20:00
9.2°C 13°C 14°C - 1% 0.43kPa
21:00
6.9°C 12°C 11°C - 0% 0.33kPa
22:00
5.3°C 12°C 9.9°C - 0% 0.33kPa
23:00
4°C 12°C 9.6°C - 0% 0.38kPa
Mon, May 25 Sunrise 04:52 Sunset 21:20
24:00
3.1°C 12°C 9.7°C - 4% 0.44kPa
01:00
2.6°C 12°C 10°C - 0% 0.5kPa
02:00
2.1°C 11°C 10°C - 0% 0.53kPa
03:00
1.8°C 11°C 10°C - 0% 0.55kPa
04:00
1.7°C 11°C 10°C - 0% 0.56kPa
05:00
1.6°C 11°C 10°C - 0% 0.56kPa
06:00
4.2°C 11°C 11°C - 0% 0.5kPa
07:00
7.6°C 11°C 14°C - 0% 0.56kPa
08:00
8.2°C 11°C 16°C - 0% 0.71kPa
09:00
9.2°C 11°C 17°C - 0% 0.8kPa
10:00
10°C 11°C 18°C - 0% 0.89kPa
11:00
11°C 12°C 20°C - 0% 1kPa
12:00
11°C 12°C 20°C - 0% 1.1kPa
13:00
13°C 12°C 21°C - 0% 1.1kPa
14:00
13°C 13°C 22°C - 0% 1kPa
15:00
14°C 13°C 22°C - 0% 1kPa
16:00
14°C 13°C 22°C - 0% 0.98kPa
17:00
14°C 14°C 22°C - 0% 0.99kPa
18:00
14°C 14°C 22°C - 0% 0.96kPa
19:00
16°C 14°C 21°C - 0% 0.76kPa
20:00
15°C 14°C 19°C - 0% 0.6kPa
21:00
12°C 14°C 17°C - 0% 0.51kPa
22:00
11°C 14°C 16°C - 1% 0.46kPa
23:00
11°C 14°C 15°C - 5% 0.43kPa
Tue, May 26 Sunrise 04:51 Sunset 21:21
24:00
11°C 14°C 15°C - 5% 0.41kPa
01:00
11°C 14°C 15°C - 8% 0.39kPa
02:00
10°C 13°C 14°C - 14% 0.39kPa
03:00
10°C 13°C 14°C - 5% 0.38kPa
04:00
10°C 13°C 14°C - 5% 0.37kPa
05:00
10°C 13°C 14°C - 5% 0.37kPa
06:00
11°C 13°C 16°C - 5% 0.41kPa
07:00
13°C 13°C 18°C - 18% 0.51kPa
08:00
14°C 13°C 19°C - 52% 0.61kPa
09:00
15°C 13°C 20°C - 40% 0.68kPa
10:00
16°C 14°C 21°C - 36% 0.75kPa
11:00
17°C 14°C 22°C - 59% 0.78kPa
12:00
17°C 15°C 22°C - 72% 0.76kPa
13:00
17°C 15°C 22°C - 48% 0.75kPa
14:00
17°C 15°C 23°C - 64% 0.76kPa
15:00
17°C 16°C 23°C - 77% 0.75kPa
16:00
17°C 16°C 22°C - 73% 0.7kPa
17:00
17°C 16°C 21°C - 64% 0.53kPa
18:00
17°C 16°C 19°C - 77% 0.32kPa
19:00
16°C 16°C 17°C - 96% 0.19kPa
20:00
13°C 16°C 15°C - 97% 0.26kPa
21:00
10°C 16°C 14°C - 99% 0.32kPa
22:00
7.4°C 15°C 12°C - 100% 0.36kPa
23:00
7.5°C 15°C 12°C - 100% 0.35kPa
Wed, May 27 Sunrise 04:50 Sunset 21:23
24:00
7.7°C 15°C 12°C - 100% 0.33kPa
01:00
7.8°C 15°C 12°C - 100% 0.32kPa
02:00
7.9°C 15°C 12°C - 100% 0.34kPa
03:00
8°C 14°C 12°C - 100% 0.35kPa
04:00
8.2°C 14°C 13°C - 100% 0.37kPa
05:00
8.7°C 14°C 13°C - 100% 0.4kPa
06:00
9.1°C 14°C 14°C - 99% 0.44kPa
07:00
9.6°C 14°C 15°C - 99% 0.48kPa
08:00
10°C 14°C 15°C - 88% 0.51kPa
09:00
11°C 14°C 16°C - 78% 0.55kPa
10:00
11°C 14°C 17°C - 67% 0.59kPa
11:00
11°C 14°C 16°C - 63% 0.54kPa
12:00
11°C 14°C 16°C - 59% 0.49kPa
13:00
11°C 14°C 15°C - 55% 0.44kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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