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Rule Morning Frost

Shetland Islands - Morning Frost - Scotland

Lerwick, 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 88% failing

Currently

Real-time conditions
Soil Temperature5.3°C
Dew Point5.1°C (moderate dew point)
Wind Speed8.3m/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 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
Sat, Feb 21
19:0040%3.2m/s
20:0042%4.8m/s
21:0040%5.8m/s
22:0036%7.2m/s
23:0031%7.3m/s
Sun, Feb 22
24:0023%8m/s
01:0016%9.1m/s
02:0016%8.8m/s
03:0016%8.2m/s
04:0016%7.7m/s
05:0018%4.3m/s
06:0029%4.5m/s
07:0013%6.9m/s
08:0013%7.3m/s
09:0016%8.6m/s
10:0016%8.3m/s
11:0014%8.5m/s
12:0015%8.6m/s
13:0018%8.4m/s
14:0042%8.4m/s
15:0025%8.9m/s
16:0022%9m/s
17:0012%8.7m/s
18:0011%8.6m/s
19:0011%8.3m/s
20:0011%8m/s
21:0011%8.5m/s
22:0011%7.9m/s
23:0011%7.2m/s
Mon, Feb 23
24:0011%6.9m/s
01:0011%6.9m/s
02:0011%6.3m/s
03:0013%5.6m/s
04:0013%5.4m/s
05:0013%5.5m/s
06:0011%5.9m/s
07:0011%6.4m/s
08:0018%6.7m/s
09:0015%6.5m/s
10:0018%6.1m/s
11:0021%6m/s
12:0021%5.7m/s
13:0031%5.2m/s
14:003.8%5.2m/s
15:003%4.6m/s
16:003.2%4.1m/s
17:0032%2.5m/s
18:0030%2.9m/s
19:0017%2.5m/s
20:0017%2.2m/s
21:0017%2.2m/s
22:0017%2m/s
23:0017%2.2m/s
Tue, Feb 24
24:0019%2.7m/s
01:0017%3m/s
02:0013%3.1m/s
03:0013%3.1m/s
04:0017%4.2m/s
05:0015%5.4m/s
06:0013%5.8m/s
07:0011%6.3m/s
08:0014%7.8m/s
09:0011%7.8m/s
10:007%8m/s
11:007%8.3m/s
12:007%8.3m/s
13:007%8.5m/s
14:007%7.9m/s
15:007%7.9m/s
16:007%7.3m/s
17:007%7m/s
18:007%6.9m/s
19:007%6.5m/s
20:007%6.6m/s
21:007%6.9m/s
22:0011%7.1m/s
23:001.3%7.4m/s
Wed, Feb 25
24:001.3%8m/s
01:000%7.4m/s
02:000%6.9m/s
03:000%6.4m/s
04:000%5.4m/s
05:000%4.4m/s
06:000%3.4m/s
07:000%3.1m/s
08:000%2.8m/s
09:000%2.5m/s
10:000%3.4m/s
11:000%4.3m/s
12:000%5.3m/s
13:000%6.4m/s
14:000%7.6m/s
15:000%8.7m/s
16:000%9.8m/s
17:000%11m/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, Feb 22 Sunrise 07:24 Sunset 17:13
19:00
5.1°C 5.3°C 6.4°C - 100% 0.08kPa
20:00
4.9°C 5.2°C 6.3°C - 100% 0.09kPa
21:00
4.6°C 5.1°C 6.1°C - 100% 0.1kPa
22:00
4.4°C 5.1°C 5.8°C - 100% 0.09kPa
23:00
4.4°C 5°C 5.7°C - 100% 0.08kPa
Mon, Feb 23 Sunrise 07:21 Sunset 17:15
24:00
4.5°C 4.9°C 6°C - 100% 0.09kPa
01:00
4.5°C 4.9°C 6.1°C - 100% 0.1kPa
02:00
4.5°C 4.8°C 5.9°C - 99% 0.09kPa
03:00
4.4°C 4.8°C 5.9°C - 90% 0.09kPa
04:00
4.3°C 4.7°C 5.8°C - 86% 0.09kPa
05:00
4.4°C 4.6°C 5.8°C - 82% 0.09kPa
06:00
4.3°C 4.5°C 5.8°C - 95% 0.09kPa
07:00
4.4°C 4.5°C 5.8°C - 87% 0.08kPa
08:00
4.6°C 4.4°C 5.8°C - 31% 0.08kPa
09:00
4.8°C 4.5°C 6.1°C - 44% 0.08kPa
10:00
5.1°C 4.7°C 6.7°C - 56% 0.11kPa
11:00
5.2°C 5°C 7.2°C - 27% 0.13kPa
12:00
5.1°C 5.4°C 7.5°C - 32% 0.15kPa
13:00
4.8°C 5.8°C 7.6°C - 9% 0.19kPa
14:00
4.5°C 6°C 7.5°C - 5% 0.2kPa
15:00
4.4°C 6.2°C 7.3°C - 5% 0.18kPa
16:00
4.2°C 6.2°C 6.7°C - 4% 0.16kPa
17:00
3.9°C 6°C 5.6°C - 2% 0.1kPa
18:00
3.6°C 5.6°C 5.2°C - 4% 0.09kPa
19:00
3.4°C 5.2°C 5°C - 98% 0.09kPa
20:00
3.3°C 4.9°C 4.8°C - 81% 0.09kPa
21:00
3.2°C 4.6°C 4.7°C - 100% 0.08kPa
22:00
3.2°C 4.3°C 4.6°C - 100% 0.08kPa
23:00
3.2°C 4.1°C 4.6°C - 100% 0.08kPa
Tue, Feb 24 Sunrise 07:18 Sunset 17:18
24:00
3.4°C 3.9°C 4.6°C - 100% 0.07kPa
01:00
3.7°C 3.7°C 4.7°C - 100% 0.06kPa
02:00
4.2°C 3.7°C 5.1°C - 100% 0.05kPa
03:00
4.3°C 3.6°C 5.2°C - 100% 0.06kPa
04:00
4.4°C 3.7°C 5.6°C - 100% 0.07kPa
05:00
4.5°C 3.8°C 5.9°C - 100% 0.09kPa
06:00
4.9°C 3.9°C 6.3°C - 100% 0.09kPa
07:00
4.9°C 4°C 6.4°C - 100% 0.09kPa
08:00
4.8°C 4.2°C 6.6°C - 100% 0.12kPa
09:00
5.3°C 4.4°C 6.9°C - 100% 0.1kPa
10:00
5.8°C 4.6°C 6.6°C - 100% 0.05kPa
11:00
6.3°C 4.8°C 6.8°C - 100% 0.03kPa
12:00
6.5°C 4.9°C 6.9°C - 100% 0.03kPa
13:00
6.5°C 5.1°C 6.9°C - 100% 0.03kPa
14:00
6.7°C 5.3°C 7.1°C - 100% 0.03kPa
15:00
6.6°C 5.5°C 7.1°C - 100% 0.03kPa
16:00
6.3°C 5.6°C 7°C - 100% 0.04kPa
17:00
6.3°C 5.7°C 6.9°C - 100% 0.04kPa
18:00
6.4°C 5.7°C 6.8°C - 100% 0.03kPa
19:00
6.5°C 5.8°C 7.1°C - 100% 0.04kPa
20:00
6.6°C 5.8°C 7.2°C - 100% 0.04kPa
21:00
6.5°C 5.9°C 7.2°C - 100% 0.05kPa
22:00
6.3°C 6°C 7.6°C - 100% 0.09kPa
23:00
6.2°C 6°C 7.9°C - 100% 0.12kPa
Wed, Feb 25 Sunrise 07:15 Sunset 17:20
24:00
5.9°C 6.1°C 7.8°C - 100% 0.13kPa
01:00
6.2°C 3246°C 7.7°C - 100% 0.1kPa
02:00
6.5°C 6486°C 7.6°C - 100% 0.08kPa
03:00
6.8°C 9726°C 7.6°C - 100% 0.05kPa
04:00
6.7°C 9726°C 7.6°C - 100% 0.06kPa
05:00
6.6°C 9726°C 7.6°C - 100% 0.06kPa
06:00
6.6°C 9726°C 7.6°C - 100% 0.07kPa
07:00
6.6°C 9726°C 7.5°C - 100% 0.06kPa
08:00
6.6°C 9726°C 7.5°C - 100% 0.06kPa
09:00
6.7°C 9726°C 7.4°C - 100% 0.05kPa
10:00
6.8°C 9726°C 7.3°C - 100% 0.04kPa
11:00
6.8°C 9726°C 7.2°C - 100% 0.03kPa
12:00
6.9°C 9726°C 7.1°C - 100% 0.01kPa
13:00
6.9°C 9726°C 7.2°C - 100% 0.02kPa
14:00
6.8°C 9726°C 7.3°C - 100% 0.03kPa
15:00
6.8°C 9726°C 7.5°C - 100% 0.05kPa
16:00
6.8°C 9726°C 7.7°C - 83% 0.07kPa
17:00
6.8°C 9726°C 8°C - 66% 0.09kPa
18:00
6.8°C 9726°C 8.3°C - 49% 0.11kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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