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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
Wind Speed 100% failing
Time Window 85% failing

Currently

Real-time conditions
Soil Temperature4.8°C
Dew Point-0.6°C (low dew point)
Wind Speed13.6m/s (moderate winds)
Cloud Cover100%

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, Apr 4
03:0026%5.9m/s
04:0030%4.5m/s
05:0028%3m/s
06:0016%2m/s
07:0016%2.3m/s
08:0015%2.3m/s
09:0017%3.4m/s
10:0013%3.4m/s
11:0013%2.8m/s
12:0017%3.5m/s
13:0015%4.3m/s
14:0016%7.6m/s
15:0019%9.9m/s
16:0031%9.9m/s
17:0027%11m/s
18:0019%11m/s
19:0014%11m/s
20:0014%12m/s
21:0014%13m/s
22:0033%17m/s
23:0015%16m/s
Sun, Apr 5
24:0011%15m/s
01:007%16m/s
02:0011%13m/s
03:0011%14m/s
04:0011%12m/s
05:0012%9.7m/s
06:0011%8.4m/s
07:0012%7.6m/s
08:0013%8.4m/s
09:009%9.2m/s
10:0013%9.6m/s
11:0014%9.4m/s
12:0031%10m/s
13:0030%11m/s
14:0027%11m/s
15:0022%11m/s
16:0028%10m/s
17:0022%9.8m/s
18:0026%8.9m/s
19:0023%7.7m/s
20:0015%5.6m/s
21:0024%2.9m/s
22:0019%2.4m/s
23:0020%1.9m/s
Mon, Apr 6
24:0019%2.3m/s
01:0019%2.5m/s
02:0015%2.5m/s
03:0015%2.5m/s
04:0015%2.5m/s
05:0017%2.9m/s
06:0019%2.4m/s
07:0015%2.3m/s
08:0019%2.5m/s
09:0022%2.6m/s
10:0033%2.9m/s
11:0035%4.3m/s
12:0035%5.2m/s
13:0030%5.9m/s
14:0033%6.2m/s
15:0030%5.9m/s
16:0031%5.5m/s
17:0031%4.5m/s
18:0018%3.6m/s
19:0020%2.6m/s
20:0017%2.2m/s
21:0017%2.1m/s
22:0018%1.9m/s
23:0028%1.9m/s
Tue, Apr 7
24:0032%1.8m/s
01:0021%1.8m/s
02:0026%1.8m/s
03:0034%1.9m/s
04:0034%2m/s
05:0034%2.3m/s
06:0034%2.2m/s
07:0034%2.3m/s
08:0023%4.3m/s
09:003%6.3m/s
10:002.5%8.3m/s
11:000%8.1m/s
12:000%7.8m/s
13:000%7.6m/s
14:000%6.4m/s
15:000%5.3m/s
16:000%4.1m/s
17:000%3.9m/s
18:000%3.7m/s
19:001.7%3.5m/s
20:001.7%3.5m/s
21:001.8%3.6m/s
22:001.8%3.6m/s
23:001.8%3.6m/s
Wed, Apr 8
24:001.7%3.5m/s
01:001.7%3.5m/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, Apr 5 Sunrise 06:32 Sunset 19:52
03:00
-0.6°C 4.8°C 1.6°C - 100% 0.1kPa
04:00
-0.6°C 4.6°C 1.6°C - 99% 0.1kPa
05:00
-0.9°C 4.4°C 1.4°C - 79% 0.1kPa
06:00
-0.7°C 4.2°C 1.1°C - 92% 0.08kPa
07:00
-0.1°C 4°C 1.5°C - 79% 0.08kPa
08:00
0.4°C 3.9°C 2°C - 94% 0.08kPa
09:00
1.7°C 3.9°C 2.4°C - 97% 0.04kPa
10:00
1.4°C 3.9°C 2.5°C - 100% 0.06kPa
11:00
0.1°C 3.8°C 2.3°C - 70% 0.1kPa
12:00
0°C 3.9°C 3.5°C - 32% 0.17kPa
13:00
-0.8°C 3.9°C 4°C - 80% 0.24kPa
14:00
-0.1°C 4.1°C 4.4°C - 100% 0.23kPa
15:00
0.2°C 4.2°C 4°C - 100% 0.2kPa
16:00
-0.2°C 4.4°C 4.2°C - 72% 0.22kPa
17:00
-0.2°C 4.4°C 3.7°C - 93% 0.19kPa
18:00
-0.2°C 4.4°C 3.1°C - 46% 0.17kPa
19:00
-0.8°C 4.2°C 2.2°C - 65% 0.14kPa
20:00
-1.4°C 4.1°C 1.1°C - 68% 0.11kPa
21:00
-1.8°C 3.9°C -0.05°C - 37% 0.07kPa
22:00
-2°C 3.9°C -0.54°C - 99% 0.06kPa
23:00
-2.1°C 3.9°C -0.7°C - 78% 0.06kPa
Mon, Apr 6 Sunrise 06:32 Sunset 19:52
24:00
-2°C 3.9°C -0.75°C - 100% 0.05kPa
01:00
-1.9°C 3.9°C -0.85°C - 99% 0.04kPa
02:00
-1.6°C 3.9°C -0.82°C - 97% 0.03kPa
03:00
-1.5°C 3.9°C -0.6°C - 83% 0.04kPa
04:00
-1.1°C 3.9°C -0.24°C - 100% 0.04kPa
05:00
0.3°C 3.8°C 1.5°C - 100% 0.06kPa
06:00
0.6°C 3.7°C 1.9°C - 100% 0.06kPa
07:00
0.4°C 3.6°C 1.3°C - 100% 0.04kPa
08:00
0.9°C 3.5°C 2.3°C - 100% 0.07kPa
09:00
0.7°C 3.6°C 3.6°C - 100% 0.15kPa
10:00
0.2°C 3.6°C 4.5°C - 100% 0.22kPa
11:00
-0.5°C 3.6°C 5.9°C - 84% 0.34kPa
12:00
0.5°C 3.6°C 7.1°C - 100% 0.37kPa
13:00
2°C 3.6°C 7.8°C - 79% 0.35kPa
14:00
3.2°C 3.6°C 8.8°C - 50% 0.36kPa
15:00
4°C 3.6°C 9.3°C - 78% 0.36kPa
16:00
4.6°C 3.7°C 9.2°C - 100% 0.31kPa
17:00
5.2°C 4°C 8.4°C - 100% 0.21kPa
18:00
5.4°C 4.3°C 8.4°C - 100% 0.2kPa
19:00
5.1°C 4.4°C 7.2°C - 100% 0.14kPa
20:00
4.2°C 4.4°C 5.5°C - 100% 0.08kPa
21:00
3.8°C 4.4°C 5°C - 100% 0.07kPa
22:00
3.6°C 4.4°C 4.7°C - 73% 0.06kPa
23:00
3.1°C 4.3°C 4.2°C - 20% 0.06kPa
Tue, Apr 7 Sunrise 06:30 Sunset 19:54
24:00
2.9°C 4.1°C 3.9°C - 7% 0.05kPa
01:00
2.8°C 4°C 3.8°C - 52% 0.06kPa
02:00
2.5°C 3.9°C 3.6°C - 32% 0.06kPa
03:00
2.3°C 3.8°C 3.5°C - 5% 0.06kPa
04:00
1.9°C 3.7°C 3.1°C - 5% 0.06kPa
05:00
1.6°C 3.5°C 2.8°C - 5% 0.06kPa
06:00
1.1°C 3.4°C 2.4°C - 4% 0.06kPa
07:00
0.9°C 3.3°C 2.4°C - 5% 0.07kPa
08:00
3.6°C 4.8°C 6.4°C - 26% 0.17kPa
09:00
6.2°C 6.3°C 10°C - 47% 0.31kPa
10:00
8.6°C 7.9°C 14°C - 68% 0.52kPa
11:00
8°C 8.1°C 13°C - 77% 0.47kPa
12:00
7.5°C 8.3°C 13°C - 85% 0.42kPa
13:00
7°C 8.6°C 12°C - 94% 0.38kPa
14:00
6.4°C 8.5°C 10°C - 90% 0.3kPa
15:00
5.8°C 8.5°C 9.1°C - 85% 0.23kPa
16:00
5.2°C 8.5°C 7.8°C - 81% 0.17kPa
17:00
4.8°C 8.2°C 7.1°C - 86% 0.15kPa
18:00
4.3°C 8°C 6.4°C - 90% 0.13kPa
19:00
3.8°C 7.8°C 5.6°C - 95% 0.11kPa
20:00
3.4°C 7.6°C 5.4°C - 86% 0.12kPa
21:00
3°C 7.4°C 5.3°C - 77% 0.13kPa
22:00
2.5°C 7.2°C 5.1°C - 68% 0.14kPa
23:00
2.6°C 7°C 5.1°C - 78% 0.14kPa
Wed, Apr 8 Sunrise 06:27 Sunset 19:56
24:00
2.7°C 6.8°C 5.2°C - 89% 0.14kPa
01:00
2.7°C 6.7°C 5.3°C - 100% 0.14kPa
02:00
3.7°C 6.8°C 6.9°C - 100% 0.2kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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