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Rule Morning Frost

Durness - Morning Frost - Scotland

Durness, Scotland, 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 86% failing

Currently

Real-time conditions
Soil Temperature4.0°C
Dew Point3.7°C (low dew point)
Wind Speed4.9m/s (calm conditions)
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 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 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
Sun, Feb 22
02:0018%9.6m/s
03:0025%9.6m/s
04:0021%9.9m/s
05:0025%10m/s
06:0022%9.6m/s
07:0014%9.5m/s
08:0018%9.5m/s
09:0037%10m/s
10:0037%11m/s
11:0029%11m/s
12:0025%11m/s
13:0025%11m/s
14:0029%11m/s
15:0022%11m/s
16:0014%9.7m/s
17:0018%9.3m/s
18:0021%10m/s
19:0018%10m/s
20:0018%9.7m/s
21:0014%9m/s
22:0014%8.8m/s
23:0014%8.5m/s
Mon, Feb 23
24:0014%8.9m/s
01:0011%5.7m/s
02:0013%4.9m/s
03:009%5.1m/s
04:0013%5.6m/s
05:0013%5.6m/s
06:0014%5.9m/s
07:0013%4.8m/s
08:009%4.2m/s
09:0015%3.1m/s
10:0018%3.7m/s
11:0020%4.3m/s
12:0037%3.3m/s
13:0035%3.2m/s
14:002.5%3.2m/s
15:002.7%2.8m/s
16:003%2.9m/s
17:002.5%3.2m/s
18:0018%3.1m/s
19:0018%2.9m/s
20:0018%3m/s
21:0020%2.6m/s
22:0020%2.4m/s
23:0020%2.4m/s
Tue, Feb 24
24:0020%2.4m/s
01:0020%2.7m/s
02:0018%3.4m/s
03:0015%4.1m/s
04:0015%4.2m/s
05:0013%4.2m/s
06:0015%4.1m/s
07:0015%4.1m/s
08:0018%4m/s
09:0018%3.8m/s
10:0018%4.1m/s
11:0016%4.6m/s
12:0031%4.1m/s
13:0029%4.2m/s
14:002.8%4.2m/s
15:003%3.7m/s
16:001.7%3.9m/s
17:001.7%4.1m/s
18:001.5%4.4m/s
19:001.7%4.2m/s
20:001.5%4.4m/s
21:001.7%4.2m/s
22:001.5%4.2m/s
23:001.5%4.4m/s
Wed, Feb 25
24:001.5%4.8m/s
01:001.5%4.6m/s
02:001.5%4.5m/s
03:001.7%4.1m/s
04:001.4%3.5m/s
05:001%3.4m/s
06:001%3.2m/s
07:000%3.2m/s
08:000%3.3m/s
09:000%3.4m/s
10:000%3.5m/s
11:000%3.5m/s
12:000%3.6m/s
13:000%3.6m/s
14:000%3.6m/s
15:000%3.5m/s
16:000%3.3m/s
17:000%3.1m/s
18:000%2.8m/s
19:000%2.7m/s
20:000%2.7m/s
21:000%2.6m/s
22:000%3.3m/s
23:000%3.9m/s
Thu, Feb 26
24:000%4.6m/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
Mon, Feb 23 Sunrise 07:31 Sunset 17:34
02:00
3.7°C 4°C 4.7°C - 100% 0.06kPa
03:00
4°C 4°C 5°C - 100% 0.06kPa
04:00
4.3°C 4°C 5.4°C - 100% 0.06kPa
05:00
4.2°C 4.1°C 5.9°C - 91% 0.1kPa
06:00
4°C 4.2°C 5.9°C - 100% 0.12kPa
07:00
4.2°C 4.2°C 5.5°C - 100% 0.08kPa
08:00
4.7°C 4.2°C 5.7°C - 100% 0.06kPa
09:00
4.4°C 4.3°C 5.6°C - 100% 0.07kPa
10:00
4.4°C 4.4°C 6.2°C - 91% 0.12kPa
11:00
4.4°C 4.7°C 7°C - 51% 0.16kPa
12:00
4.3°C 5.2°C 7.4°C - 21% 0.19kPa
13:00
4.4°C 5.7°C 7.6°C - 48% 0.21kPa
14:00
4.5°C 6°C 7.5°C - 100% 0.19kPa
15:00
4.4°C 6.2°C 7.5°C - 98% 0.2kPa
16:00
4.1°C 6.2°C 7.5°C - 100% 0.21kPa
17:00
4.1°C 6.2°C 7.2°C - 100% 0.19kPa
18:00
4°C 6°C 6.7°C - 100% 0.17kPa
19:00
3.8°C 5.7°C 6.3°C - 100% 0.15kPa
20:00
4.1°C 5.5°C 6.3°C - 100% 0.14kPa
21:00
4.3°C 5.3°C 6.3°C - 100% 0.12kPa
22:00
4.3°C 5.1°C 6.3°C - 100% 0.12kPa
23:00
4.2°C 5°C 6.3°C - 100% 0.13kPa
Tue, Feb 24 Sunrise 07:28 Sunset 17:36
24:00
4.3°C 4.9°C 6.1°C - 100% 0.12kPa
01:00
4.2°C 4.9°C 6°C - 100% 0.11kPa
02:00
4.1°C 4.8°C 5.9°C - 100% 0.11kPa
03:00
4.2°C 4.7°C 5.7°C - 100% 0.09kPa
04:00
4.3°C 4.7°C 5.7°C - 100% 0.09kPa
05:00
4.4°C 4.7°C 5.8°C - 100% 0.09kPa
06:00
4.3°C 4.7°C 6°C - 100% 0.1kPa
07:00
4.5°C 4.7°C 6.2°C - 100% 0.1kPa
08:00
4.5°C 4.7°C 6.3°C - 100% 0.11kPa
09:00
4.6°C 4.7°C 6.4°C - 100% 0.11kPa
10:00
4.8°C 4.9°C 7.1°C - 100% 0.15kPa
11:00
5°C 5.2°C 7.8°C - 100% 0.18kPa
12:00
5.1°C 5.6°C 8.2°C - 100% 0.21kPa
13:00
5.3°C 5.9°C 8.7°C - 100% 0.23kPa
14:00
5.7°C 6.3°C 9.4°C - 100% 0.26kPa
15:00
5.9°C 6.5°C 9.1°C - 100% 0.23kPa
16:00
6°C 6.5°C 8.6°C - 100% 0.18kPa
17:00
5.9°C 6.5°C 8.1°C - 100% 0.15kPa
18:00
6°C 6.5°C 8.1°C - 100% 0.14kPa
19:00
6°C 6.5°C 8.2°C - 100% 0.15kPa
20:00
6°C 6.5°C 8.2°C - 100% 0.15kPa
21:00
6°C 6.5°C 8.2°C - 100% 0.15kPa
22:00
6°C 6.5°C 8.2°C - 100% 0.15kPa
23:00
6.1°C 6.5°C 8.2°C - 100% 0.15kPa
Wed, Feb 25 Sunrise 07:26 Sunset 17:38
24:00
6.3°C 6.5°C 8.4°C - 100% 0.15kPa
01:00
6.5°C 6.5°C 8.4°C - 100% 0.14kPa
02:00
6.5°C 6.5°C 8.4°C - 100% 0.13kPa
03:00
6.8°C 6.6°C 8.4°C - 100% 0.11kPa
04:00
7.1°C 6.6°C 8.1°C - 100% 0.07kPa
05:00
7.1°C 6.6°C 8°C - 100% 0.06kPa
06:00
7.3°C 6.6°C 7.9°C - 100% 0.05kPa
07:00
7.2°C 3246°C 8°C - 100% 0.06kPa
08:00
7.1°C 6486°C 8.1°C - 100% 0.07kPa
09:00
7.1°C 9726°C 8.2°C - 100% 0.08kPa
10:00
7°C 9726°C 8.2°C - 100% 0.09kPa
11:00
6.9°C 9726°C 8.2°C - 100% 0.09kPa
12:00
6.8°C 9726°C 8.2°C - 100% 0.1kPa
13:00
6.7°C 9726°C 8.2°C - 100% 0.1kPa
14:00
6.6°C 9726°C 8.1°C - 100% 0.1kPa
15:00
6.5°C 9726°C 8.1°C - 100% 0.11kPa
16:00
6.6°C 9726°C 8°C - 94% 0.09kPa
17:00
6.8°C 9726°C 7.9°C - 88% 0.08kPa
18:00
6.9°C 9726°C 7.8°C - 81% 0.06kPa
19:00
6.6°C 9726°C 7.7°C - 88% 0.08kPa
20:00
6.4°C 9726°C 7.7°C - 94% 0.09kPa
21:00
6.1°C 9726°C 7.6°C - 100% 0.1kPa
22:00
5.2°C 9726°C 7.2°C - 100% 0.13kPa
23:00
4.3°C 9726°C 6.8°C - 100% 0.15kPa
Thu, Feb 26 Sunrise 07:23 Sunset 17:41
24:00
3.4°C 9726°C 6.4°C - 100% 0.18kPa
01:00
3.1°C 9726°C 6.5°C - 88% 0.2kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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