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Rule Morning Frost

Rannoch Moor - Morning Frost - Scotland

Kinloch Rannoch, Scotland, United Kingdom

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature7.3°C
Dew Point5.1°C (moderate dew point)
Wind Speed1.6m/s (calm conditions)
Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
Next opportunity
Light Frost (radiative) at Sunrise
Rannoch Moor
Tue, Apr 14 · 05:27–06:00 · 1h window
Low confidence
35%
❄️Frost Probability63%
Soil Temperature: 2.9°C
Dew Point: 0.3°C (low dew point)
Wind Speed: 1.1m/s (calm conditions)
Cloud Cover: 4%

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the conditions that create Scotland's dramatic frost photography opportunities. We combine temperature, dewpoint, wind, and humidity data to predict when hoar frost will form across Highland landscapes.

The Scottish Highlands offer exceptional frost photography from November through March. Cold clear nights combined with Scotland's naturally high humidity create heavy hoar frost formations that transform heather moorlands, frozen lochs, and mountain valleys into winter wonderlands. The dramatic Highland topography means frost conditions vary by elevation and exposure, creating diverse opportunities.

What makes Scotland special for frost photography:

  • Highland hoar frost - Heavy frost deposits on heather create sparkling purple-white moorlands
  • Frozen lochs - Ice formations along loch shores, particularly in the Cairngorms
  • Mountain ice crystals - High Cairngorms peaks develop spectacular rime ice formations
  • Glen Coe frost - The famous valley transformed by frost on grass and bracken

Rannoch Moor becomes otherworldly under heavy frost—the vast peatland plateau covered in sparkling crystals with distant peaks beyond. The Cairngorms' high elevation means consistent frost formation, with frozen pools and ice-covered grasses creating miniature landscapes. Glen Coe's dramatic valley takes on ethereal beauty when frost transforms the bracken-covered slopes. Frozen lochs like Loch an Eilein develop fascinating ice patterns along their shores. The key is clear, calm nights following cold days—our forecast identifies these conditions and tracks morning visibility to ensure you can capture the frost before it melts.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 91 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, Apr 8
06:0015%1.5m/s
07:0015%1.5m/s
08:0015%1.7m/s
09:0015%1.6m/s
10:001.2%2m/s
11:002.3%2.6m/s
12:003%3.1m/s
13:002.8%3.7m/s
14:000%3.9m/s
15:000%3.9m/s
16:000%4m/s
17:000%3.6m/s
18:000%3.4m/s
19:000%2.6m/s
20:000%2.3m/s
21:000%2.6m/s
22:000%2.4m/s
23:000%2.2m/s
Thu, Apr 9
24:001.9%2m/s
01:001.9%1.9m/s
02:001.9%1.8m/s
03:001.8%1.6m/s
04:001.8%1.5m/s
05:001.4%1.4m/s
06:001.2%2.7m/s
07:001.2%2.1m/s
08:001.2%2.2m/s
09:000.8%5m/s
10:001.2%2.6m/s
11:001.2%4.5m/s
12:0013%5m/s
13:0028%6.8m/s
14:003%8.5m/s
15:003%8.8m/s
16:003%8.6m/s
17:001.3%6.3m/s
18:007%6.3m/s
19:0022%9.1m/s
20:0018%8.1m/s
21:009%4.6m/s
22:0018%7m/s
23:0011%5.7m/s
Fri, Apr 10
24:0017%4.7m/s
01:0022%4.6m/s
02:0032%3.8m/s
03:0032%2.9m/s
04:0034%2.7m/s
05:0034%2.4m/s
06:0026%2.3m/s
07:0023%2m/s
08:0034%2.3m/s
09:0039%2.5m/s
10:0039%2.2m/s
11:0037%2.9m/s
12:0037%3.6m/s
13:0035%4.3m/s
14:0035%5.2m/s
15:0033%6m/s
16:0031%7.1m/s
17:0033%8.2m/s
18:0034%8.3m/s
19:0029%8m/s
20:0030%8.1m/s
21:0024%9.3m/s
22:009%9.1m/s
23:0016%9.1m/s
Sat, Apr 11
24:0016%9.2m/s
01:0016%10m/s
02:0016%9.9m/s
03:0016%8.6m/s
04:0016%6.7m/s
05:0016%5.7m/s
06:0022%5m/s
07:0024%6m/s
08:0038%6.4m/s
09:0047%6.7m/s
10:0055%7.1m/s
11:0043%7.1m/s
12:0035%7m/s
13:0032%7m/s
14:0024%6.9m/s
15:0020%6.9m/s
16:0020%6.8m/s
17:0016%5.8m/s
18:0018%4.8m/s
19:0020%3.8m/s
20:0018%4.7m/s
21:0018%5.5m/s
22:0016%6.3m/s
23:0016%5.8m/s
Sun, Apr 12
24:0018%5.3m/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
Thu, Apr 9 Sunrise 06:25 Sunset 20:12
03:00
5.1°C 7.3°C 6.5°C - 100% 0.09kPa
04:00
5.3°C 7.2°C 6.3°C - 100% 0.07kPa
05:00
5.4°C 7°C 6.1°C - 100% 0.04kPa
06:00
5.6°C 6.9°C 6°C - 100% 0.02kPa
07:00
5.3°C 6.8°C 5.7°C - 100% 0.02kPa
08:00
5.1°C 6.6°C 5.6°C - 100% 0.03kPa
09:00
3.7°C 6.5°C 4.5°C - 100% 0.05kPa
10:00
2.5°C 6.4°C 3.2°C - 100% 0.04kPa
11:00
2.2°C 6.1°C 3.3°C - 100% 0.06kPa
12:00
1.1°C 6°C 3°C - 100% 0.1kPa
13:00
-0.5°C 5.9°C 4.1°C - 68% 0.23kPa
14:00
-1.3°C 6.1°C 5.2°C - 96% 0.33kPa
15:00
-2.1°C 6.2°C 4.9°C - 86% 0.34kPa
16:00
-2°C 6.2°C 4.6°C - 80% 0.32kPa
17:00
1°C 6.2°C 3.2°C - 100% 0.11kPa
18:00
1.5°C 5.9°C 2.3°C - 100% 0.04kPa
19:00
-1.2°C 5.6°C 2.7°C - 100% 0.18kPa
20:00
-0.5°C 5.3°C 2.1°C - 53% 0.12kPa
21:00
0.4°C 4.9°C 1.2°C - 93% 0.04kPa
22:00
-0.8°C 4.7°C 1.8°C - 48% 0.12kPa
23:00
-1°C 4.3°C 0.78°C - 94% 0.08kPa
Fri, Apr 10 Sunrise 06:25 Sunset 20:12
24:00
-1.5°C 4°C 0.88°C - 48% 0.1kPa
01:00
-1.9°C 3.8°C 0.001°C - 33% 0.08kPa
02:00
-2.9°C 3.8°C -0.55°C - 5% 0.09kPa
03:00
-3.2°C 3.8°C -1.2°C - 5% 0.08kPa
04:00
-3.3°C 3.8°C -1.7°C - 5% 0.06kPa
05:00
-3.4°C 3.8°C -2°C - 5% 0.05kPa
06:00
-3.4°C 3.8°C -2°C - 28% 0.05kPa
07:00
-3.3°C 3.8°C -1.7°C - 42% 0.06kPa
08:00
-3.1°C 3.6°C 0.04°C - 52% 0.13kPa
09:00
-3.7°C 3.6°C 1.5°C - 52% 0.22kPa
10:00
-4.3°C 3.6°C 2.8°C - 100% 0.3kPa
11:00
-4.4°C 3.6°C 3.5°C - 100% 0.34kPa
12:00
-4.5°C 3.6°C 3.9°C - 100% 0.37kPa
13:00
-3.9°C 3.6°C 4°C - 100% 0.35kPa
14:00
-3.4°C 3.6°C 4.9°C - 100% 0.39kPa
15:00
-3.6°C 3.6°C 4.4°C - 100% 0.37kPa
16:00
-4.1°C 3.6°C 4.8°C - 100% 0.41kPa
17:00
-2.9°C 3.6°C 4.9°C - 98% 0.37kPa
18:00
-2.7°C 3.6°C 4.1°C - 71% 0.32kPa
19:00
-2.2°C 3.6°C 2.9°C - 85% 0.23kPa
20:00
-2.4°C 3.4°C 2.4°C - 73% 0.21kPa
21:00
-1.7°C 3.3°C 1.6°C - 84% 0.15kPa
22:00
0°C 3.1°C 0.58°C - 98% 0.03kPa
23:00
0°C 3°C 0.49°C - 100% 0.02kPa
Sat, Apr 11 Sunrise 06:23 Sunset 20:14
24:00
0.1°C 2.9°C 0.59°C - 100% 0.02kPa
01:00
0.4°C 2.8°C 0.89°C - 100% 0.02kPa
02:00
0.3°C 2.7°C 0.64°C - 100% 0.02kPa
03:00
0°C 2.6°C 0.27°C - 100% 0.01kPa
04:00
0.3°C 2.5°C 0.56°C - 100% 0.01kPa
05:00
0.9°C 2.5°C 1.1°C - 100% 0.01kPa
06:00
-0.6°C 2.5°C 0.58°C - 100% 0.05kPa
07:00
-1.1°C 2.4°C 0.3°C - 53% 0.06kPa
08:00
-1.4°C 2.5°C 1.6°C - 37% 0.13kPa
09:00
-1.8°C 2.5°C 3°C - 21% 0.22kPa
10:00
-2.5°C 2.6°C 4.3°C - 5% 0.32kPa
11:00
-1.9°C 2.6°C 3.6°C - 26% 0.26kPa
12:00
-1.4°C 2.7°C 2.9°C - 48% 0.2kPa
13:00
-1.1°C 2.8°C 2.2°C - 69% 0.15kPa
14:00
-0.6°C 2.7°C 2°C - 79% 0.12kPa
15:00
-0.2°C 2.6°C 1.7°C - 90% 0.09kPa
16:00
0.2°C 2.5°C 1.5°C - 100% 0.06kPa
17:00
0.8°C 2.5°C 1.8°C - 100% 0.05kPa
18:00
1.4°C 2.4°C 2°C - 100% 0.03kPa
19:00
1.9°C 2.4°C 2.3°C - 100% 0.02kPa
20:00
2.2°C 2.4°C 2.5°C - 100% 0.02kPa
21:00
2.4°C 2.4°C 2.8°C - 100% 0.02kPa
22:00
2.6°C 2.4°C 3°C - 100% 0.02kPa
23:00
2.2°C 2.4°C 2.6°C - 100% 0.02kPa
Sun, Apr 12 Sunrise 06:20 Sunset 20:16
24:00
1.9°C 2.4°C 2.3°C - 100% 0.02kPa
01:00
1.5°C 2.4°C 1.9°C - 100% 0.02kPa
02:00
1.3°C 2.4°C 1.7°C - 100% 0.02kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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