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Rule Morning Frost

Scottish Highlands - Morning Frost - Scotland

Scotland, United Kingdom

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature6.3°C
Dew Point4.7°C (low dew point)
Wind Speed2.7m/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
Scottish Highlands
Tue, Apr 14 · 05:26–07:41 · 2h window
Low confidence
21%
❄️Frost Probability61-63%
Soil Temperature: 2.4°C
Dew Point: -2.1°C (low dew point)
Wind Speed: 1.0m/s (calm conditions)
Cloud Cover: 5%

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
06:0013%2.1m/s
07:0013%2.1m/s
08:0013%2.3m/s
09:0013%2.2m/s
10:0013%2.4m/s
11:0025%3.5m/s
12:002.8%4.5m/s
13:002.6%4.6m/s
14:003%4.5m/s
15:003%4.9m/s
16:000%5.4m/s
17:000%4.7m/s
18:000%3.9m/s
19:000%3.1m/s
20:000%2.8m/s
21:001.7%3m/s
22:001.7%3.2m/s
23:001.7%3.1m/s
Thu, Apr 9
24:001.7%2.9m/s
01:001.6%2.8m/s
02:001.6%2.6m/s
03:001.6%2.7m/s
04:001.2%2.7m/s
05:001.2%2.5m/s
06:0013%2.7m/s
07:0013%2.8m/s
08:0011%3.2m/s
09:0011%3.7m/s
10:0015%3.4m/s
11:0016%5.1m/s
12:0013%5m/s
13:0023%6.2m/s
14:0031%8m/s
15:0031%8.6m/s
16:0031%8m/s
17:0027%7.9m/s
18:0013%5.3m/s
19:0022%7.8m/s
20:0021%8.3m/s
21:0020%5.1m/s
22:0015%3.7m/s
23:0014%4.4m/s
Fri, Apr 10
24:0019%4.1m/s
01:0017%3.8m/s
02:0024%3.5m/s
03:0034%1.9m/s
04:0034%2.2m/s
05:0030%2.4m/s
06:0034%2.3m/s
07:0030%2.4m/s
08:0045%2.6m/s
09:0037%3.4m/s
10:0037%3m/s
11:0037%3.3m/s
12:0035%3.7m/s
13:0033%4m/s
14:0031%5m/s
15:0031%6m/s
16:0033%6.8m/s
17:0033%8.1m/s
18:0017%8.3m/s
19:0014%8.5m/s
20:0017%9.2m/s
21:0021%8.7m/s
22:0017%9m/s
23:0021%12m/s
Sat, Apr 11
24:0016%12m/s
01:0016%13m/s
02:0016%13m/s
03:0016%12m/s
04:0016%11m/s
05:0016%8.1m/s
06:0016%6.3m/s
07:0024%6.4m/s
08:0030%6.9m/s
09:0042%7.4m/s
10:0066%7.9m/s
11:0051%8.1m/s
12:0051%8.3m/s
13:0046%8.5m/s
14:0045%8.6m/s
15:0036%8.7m/s
16:0031%8.7m/s
17:0031%8.1m/s
18:0031%7.4m/s
19:0031%6.8m/s
20:0031%6m/s
21:0033%5.3m/s
22:0033%4.5m/s
23:0033%5.4m/s
Sun, Apr 12
24:0031%6.2m/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 06:24 Sunset 20:12
03:00
4.7°C 6.3°C 5.9°C - 100% 0.07kPa
04:00
5°C 6.2°C 5.8°C - 100% 0.05kPa
05:00
5.1°C 6.1°C 5.6°C - 100% 0.03kPa
06:00
5.1°C 6°C 5.5°C - 100% 0.02kPa
07:00
5.1°C 5.9°C 5.5°C - 100% 0.02kPa
08:00
5°C 5.8°C 5.6°C - 100% 0.04kPa
09:00
4.6°C 5.7°C 5.2°C - 100% 0.04kPa
10:00
1.4°C 5.6°C 2.9°C - 100% 0.08kPa
11:00
1.8°C 5.7°C 4.3°C - 98% 0.13kPa
12:00
1.7°C 5.6°C 3°C - 100% 0.07kPa
13:00
-0.5°C 5.4°C 3.5°C - 72% 0.19kPa
14:00
-1.9°C 5.8°C 5°C - 100% 0.34kPa
15:00
-2.1°C 5.9°C 4.7°C - 100% 0.33kPa
16:00
-2.8°C 6°C 4.7°C - 94% 0.35kPa
17:00
-1.4°C 6°C 4.3°C - 96% 0.28kPa
18:00
0.9°C 5.7°C 2.2°C - 100% 0.06kPa
19:00
-1°C 5.4°C 2.5°C - 100% 0.17kPa
20:00
-1.1°C 5°C 1.8°C - 29% 0.13kPa
21:00
-1.7°C 4.7°C 0.58°C - 31% 0.1kPa
22:00
-0.7°C 4.6°C 0.37°C - 90% 0.05kPa
23:00
-1.3°C 4.3°C 1.1°C - 69% 0.1kPa
Fri, Apr 10 Sunrise 06:24 Sunset 20:12
24:00
-1.9°C 4.1°C 0.18°C - 59% 0.09kPa
01:00
-2.2°C 4°C -0.4°C - 89% 0.07kPa
02:00
-2.6°C 3.8°C -0.65°C - 38% 0.08kPa
03:00
-3°C 3.8°C -1.8°C - 5% 0.04kPa
04:00
-3.3°C 3.8°C -2.2°C - 5% 0.04kPa
05:00
-3.5°C 3.8°C -2.3°C - 23% 0.05kPa
06:00
-3.7°C 3.8°C -2.2°C - 5% 0.05kPa
07:00
-3.7°C 3.8°C -1.9°C - 21% 0.07kPa
08:00
-3.7°C 3.5°C -0.16°C - 6% 0.14kPa
09:00
-4.4°C 3.5°C 1.1°C - 58% 0.22kPa
10:00
-5.3°C 3.5°C 2.2°C - 100% 0.3kPa
11:00
-5.4°C 3.5°C 3.1°C - 100% 0.36kPa
12:00
-5.5°C 3.5°C 4°C - 100% 0.41kPa
13:00
-5.6°C 3.5°C 4.6°C - 100% 0.44kPa
14:00
-5.2°C 3.5°C 4.9°C - 100% 0.45kPa
15:00
-4.6°C 3.5°C 4.5°C - 100% 0.41kPa
16:00
-4.3°C 3.5°C 4.1°C - 94% 0.37kPa
17:00
-4.1°C 3.5°C 4.4°C - 100% 0.38kPa
18:00
-0.9°C 3.5°C 2.1°C - 75% 0.14kPa
19:00
-0.7°C 3.4°C 1.1°C - 78% 0.08kPa
20:00
-0.7°C 3.2°C 0.56°C - 59% 0.05kPa
21:00
-0.6°C 3°C 0.45°C - 64% 0.05kPa
22:00
-0.5°C 2.8°C 0.18°C - 74% 0.03kPa
23:00
-1°C 2.6°C 0.49°C - 70% 0.06kPa
Sat, Apr 11 Sunrise 06:21 Sunset 20:14
24:00
-0.4°C 2.5°C 0.19°C - 100% 0.03kPa
01:00
-0.1°C 2.4°C 0.59°C - 100% 0.03kPa
02:00
0°C 2.3°C 0.47°C - 100% 0.02kPa
03:00
-0.4°C 2.2°C 0.07°C - 100% 0.02kPa
04:00
0°C 2.2°C 0.36°C - 100% 0.02kPa
05:00
0.3°C 2.1°C 0.66°C - 100% 0.02kPa
06:00
0.2°C 2.1°C 0.68°C - 82% 0.02kPa
07:00
-1.6°C 2.1°C -0.005°C - 46% 0.07kPa
08:00
-1.9°C 2°C 0.96°C - 31% 0.12kPa
09:00
-2.4°C 2°C 1.9°C - 16% 0.19kPa
10:00
-2.9°C 2°C 2.9°C - 1% 0.26kPa
11:00
-2.8°C 2°C 2.5°C - 2% 0.23kPa
12:00
-2.7°C 2°C 2°C - 4% 0.21kPa
13:00
-2.6°C 2.1°C 1.6°C - 5% 0.18kPa
14:00
-1.8°C 2°C 1.1°C - 37% 0.13kPa
15:00
-1.1°C 1.9°C 0.67°C - 68% 0.08kPa
16:00
-0.4°C 1.8°C 0.21°C - 100% 0.03kPa
17:00
-0.3°C 1.7°C 0.34°C - 100% 0.03kPa
18:00
-0.1°C 1.7°C 0.47°C - 100% 0.03kPa
19:00
0.1°C 1.6°C 0.61°C - 100% 0.02kPa
20:00
0.3°C 1.6°C 0.68°C - 100% 0.02kPa
21:00
0.4°C 1.6°C 0.75°C - 100% 0.01kPa
22:00
0.6°C 1.5°C 0.82°C - 100% 0.01kPa
23:00
0.7°C 1.5°C 0.91°C - 100% 0.01kPa
Sun, Apr 12 Sunrise 06:18 Sunset 20:16
24:00
0.7°C 1.5°C 1°C - 100% 0.01kPa
01:00
0.8°C 1.5°C 1.1°C - 100% 0.01kPa
02:00
0.6°C 1.5°C 0.9°C - 100% 0.02kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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