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Rule Morning Frost

Malham Cove - 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
Wind Speed 94% failing
Time Window 86% failing

Currently

Real-time conditions
Soil Temperature7.0°C
Dew Point5.0°C (moderate dew point)
Wind Speed12.3m/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 85 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
06:0017%1.9m/s
07:0017%2m/s
08:0013%1.9m/s
09:0017%2.4m/s
10:0015%3.5m/s
11:0018%3.4m/s
12:0016%4.8m/s
13:0014%7.5m/s
14:0014%8.4m/s
15:0027%9.1m/s
16:002.4%9.1m/s
17:002.6%9.9m/s
18:002.6%11m/s
19:002.6%11m/s
20:002.6%12m/s
21:001.3%11m/s
22:001%12m/s
23:002.8%13m/s
Sun, Apr 5
24:001.3%11m/s
01:001.3%14m/s
02:001%14m/s
03:001%13m/s
04:001.3%13m/s
05:0018%11m/s
06:0018%8.7m/s
07:0029%7.3m/s
08:0014%7.5m/s
09:0011%8m/s
10:007%8m/s
11:0018%9.7m/s
12:0023%10m/s
13:0028%10m/s
14:0031%11m/s
15:0027%11m/s
16:0028%10m/s
17:0027%9.6m/s
18:0022%8.7m/s
19:0022%7m/s
20:0024%4.7m/s
21:0017%2.6m/s
22:0017%1.8m/s
23:0019%1.5m/s
Mon, Apr 6
24:0017%1.7m/s
01:0019%1.6m/s
02:0019%1.5m/s
03:0019%1.5m/s
04:0019%1.5m/s
05:0019%1.3m/s
06:0019%1.5m/s
07:0017%1.8m/s
08:0022%1.6m/s
09:0028%1.9m/s
10:0031%3.5m/s
11:0031%4.4m/s
12:0032%5.1m/s
13:0046%5.6m/s
14:0035%5.6m/s
15:0029%5.8m/s
16:0027%6m/s
17:0029%4.5m/s
18:0031%3.8m/s
19:0020%2.5m/s
20:0020%2.7m/s
21:0017%2.8m/s
22:0018%2.6m/s
23:0018%2.6m/s
Tue, Apr 7
24:0018%2.6m/s
01:0014%2.7m/s
02:0022%3.3m/s
03:0038%4m/s
04:0044%4.6m/s
05:0042%5.5m/s
06:0040%6.3m/s
07:003.6%7.1m/s
08:003.2%7m/s
09:002.9%7m/s
10:000%6.9m/s
11:000%6m/s
12:000%5.2m/s
13:000%4.3m/s
14:000%3.7m/s
15:000%3.2m/s
16:000%2.6m/s
17:000%2.5m/s
18:000%2.5m/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
Sat, Apr 4 Sunrise 06:34 Sunset 19:49
20:00
5°C 7°C 8.9°C - 100% 0.26kPa
21:00
6°C 7.1°C 8.5°C - 100% 0.18kPa
22:00
7°C 7.1°C 8.2°C - 100% 0.08kPa
23:00
2.8°C 7.1°C 5.9°C - 34% 0.18kPa
Sun, Apr 5 Sunrise 06:34 Sunset 19:49
24:00
2.2°C 6.9°C 5°C - 100% 0.16kPa
01:00
3.1°C 6.8°C 5.4°C - 100% 0.13kPa
02:00
3.4°C 6.6°C 5.1°C - 100% 0.1kPa
03:00
1.1°C 6.4°C 3°C - 98% 0.09kPa
04:00
0°C 6.2°C 2.8°C - 98% 0.13kPa
05:00
-0.1°C 6°C 2.7°C - 44% 0.14kPa
06:00
-0.3°C 5.7°C 2.2°C - 47% 0.12kPa
07:00
-0.2°C 5.5°C 2.2°C - 5% 0.11kPa
08:00
0.4°C 5.3°C 3.1°C - 85% 0.13kPa
09:00
1.5°C 5.2°C 3.2°C - 100% 0.08kPa
10:00
2.7°C 5.2°C 3.1°C - 100% 0.02kPa
11:00
1.1°C 5.1°C 3.2°C - 44% 0.11kPa
12:00
1.6°C 5.1°C 4.6°C - 71% 0.17kPa
13:00
0.9°C 5.2°C 5°C - 72% 0.22kPa
14:00
0.9°C 5.3°C 5.1°C - 52% 0.23kPa
15:00
0.9°C 5.5°C 5.1°C - 100% 0.23kPa
16:00
0.6°C 5.6°C 5.1°C - 72% 0.24kPa
17:00
0.4°C 5.6°C 4.9°C - 100% 0.24kPa
18:00
0.1°C 5.6°C 4.1°C - 100% 0.2kPa
19:00
-0.1°C 5.4°C 3.5°C - 96% 0.18kPa
20:00
-0.7°C 5.2°C 2.4°C - 100% 0.14kPa
21:00
-1°C 5°C 1.1°C - 94% 0.09kPa
22:00
-1.4°C 4.8°C 0.26°C - 100% 0.07kPa
23:00
-1.5°C 4.7°C 0.13°C - 100% 0.07kPa
Mon, Apr 6 Sunrise 06:32 Sunset 19:51
24:00
-1.4°C 4.7°C -0.05°C - 100% 0.06kPa
01:00
-1.4°C 4.7°C -0.05°C - 99% 0.06kPa
02:00
-1.4°C 4.7°C -0.04°C - 100% 0.06kPa
03:00
-1.4°C 4.7°C -0.01°C - 98% 0.06kPa
04:00
-1.5°C 4.7°C -0.13°C - 93% 0.06kPa
05:00
-1.6°C 4.7°C -0.16°C - 97% 0.06kPa
06:00
-1.5°C 4.7°C -0.05°C - 100% 0.06kPa
07:00
-1°C 4.5°C 0.92°C - 100% 0.08kPa
08:00
-0.2°C 4.3°C 2.3°C - 100% 0.12kPa
09:00
0.2°C 4.4°C 4°C - 97% 0.19kPa
10:00
0.2°C 4.4°C 5.8°C - 93% 0.3kPa
11:00
0.1°C 4.4°C 7.3°C - 97% 0.41kPa
12:00
1.1°C 4.4°C 8.4°C - 74% 0.44kPa
13:00
2.2°C 4.4°C 9.2°C - 5% 0.45kPa
14:00
2.9°C 4.4°C 10°C - 40% 0.47kPa
15:00
4°C 4.4°C 11°C - 82% 0.47kPa
16:00
4.8°C 4.5°C 10°C - 100% 0.38kPa
17:00
5.9°C 4.7°C 9.7°C - 100% 0.28kPa
18:00
5.9°C 5°C 9.4°C - 100% 0.25kPa
19:00
5.6°C 5.1°C 8.2°C - 100% 0.18kPa
20:00
5°C 5.2°C 6.7°C - 100% 0.11kPa
21:00
4.5°C 5.2°C 5.8°C - 82% 0.08kPa
22:00
4°C 5.1°C 5.3°C - 80% 0.07kPa
23:00
3.8°C 5.1°C 5°C - 64% 0.07kPa
Tue, Apr 7 Sunrise 06:29 Sunset 19:53
24:00
3.6°C 5°C 4.7°C - 63% 0.06kPa
01:00
3.5°C 4.9°C 4.5°C - 68% 0.06kPa
02:00
3.6°C 4.9°C 5.8°C - 47% 0.13kPa
03:00
3.5°C 4.9°C 7.1°C - 26% 0.22kPa
04:00
3.3°C 4.9°C 8.4°C - 6% 0.32kPa
05:00
4°C 5.4°C 10°C - 9% 0.41kPa
06:00
4.6°C 5.9°C 12°C - 12% 0.52kPa
07:00
5°C 6.5°C 13°C - 15% 0.64kPa
08:00
5.8°C 7.1°C 14°C - 27% 0.65kPa
09:00
6.6°C 7.7°C 14°C - 40% 0.66kPa
10:00
7.4°C 8.3°C 15°C - 53% 0.67kPa
11:00
7.5°C 8.6°C 14°C - 50% 0.56kPa
12:00
7.6°C 8.9°C 13°C - 48% 0.46kPa
13:00
7.5°C 9.2°C 12°C - 45% 0.37kPa
14:00
7.2°C 9°C 11°C - 60% 0.27kPa
15:00
6.9°C 8.9°C 9.3°C - 76% 0.18kPa
16:00
6.4°C 8.8°C 7.9°C - 91% 0.1kPa
17:00
6°C 8.6°C 7.5°C - 81% 0.1kPa
18:00
5.6°C 8.4°C 7°C - 70% 0.09kPa
19:00
5.2°C 8.2°C 6.6°C - 60% 0.09kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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