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Rule Morning Frost

Isle of Lewis - Morning Frost - Scotland

Stornoway, 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 83% failing

Currently

Real-time conditions
Soil Temperature5.7°C
Dew Point2.8°C (low dew point)
Wind Speed6.3m/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
19:009%4.5m/s
20:009%4.9m/s
21:0014%7.2m/s
22:0026%7.3m/s
23:0029%6.5m/s
Sun, Feb 22
24:0026%6.1m/s
01:0014%7m/s
02:0015%7.5m/s
03:0015%7.5m/s
04:0014%7.6m/s
05:0022%7.4m/s
06:0022%7.5m/s
07:0029%7.3m/s
08:0029%7.2m/s
09:0029%7.5m/s
10:0037%7.8m/s
11:0028%8m/s
12:0027%8.1m/s
13:002.6%7.8m/s
14:002.6%8.3m/s
15:002.1%6.9m/s
16:001.3%7m/s
17:002%6.6m/s
18:002.8%6.3m/s
19:0014%6.3m/s
20:0014%6.3m/s
21:0014%5.8m/s
22:0014%5.7m/s
23:0014%6.5m/s
Mon, Feb 23
24:0013%4.5m/s
01:0013%5.5m/s
02:0011%6.1m/s
03:0016%5.5m/s
04:0014%5.9m/s
05:0014%6.4m/s
06:0014%6.4m/s
07:0014%5.8m/s
08:0016%3.5m/s
09:0033%3.7m/s
10:0033%3.6m/s
11:0030%3.6m/s
12:0032%3.8m/s
13:003%4.2m/s
14:002.8%4.2m/s
15:003.4%3.5m/s
16:003.2%2.4m/s
17:001.9%2.4m/s
18:001.9%2.3m/s
19:001.7%2.9m/s
20:001.4%2.9m/s
21:001%3.4m/s
22:001.4%3.8m/s
23:001.5%5.3m/s
Tue, Feb 24
24:000.8%5.5m/s
01:007%6.6m/s
02:007%7.9m/s
03:007%6.6m/s
04:001%7.9m/s
05:001.3%8.2m/s
06:001.3%9.1m/s
07:001.3%9.5m/s
08:001.3%9.8m/s
09:001.3%10m/s
10:001.3%11m/s
11:001.3%10m/s
12:001.3%11m/s
13:001.3%10m/s
14:001.3%9.7m/s
15:001.3%10m/s
16:001.3%9.9m/s
17:001%9.6m/s
18:001%9.5m/s
19:001%9.1m/s
20:001.3%9.4m/s
21:001.3%9.1m/s
22:001.3%9.3m/s
23:001.3%9.2m/s
Wed, Feb 25
24:001.3%8.7m/s
01:000%6.3m/s
02:000%4m/s
03:000%1.6m/s
04:000%2.2m/s
05:000%2.7m/s
06:000%3.3m/s
07:000%3.5m/s
08:000%3.7m/s
09:000%3.9m/s
10:000%3.4m/s
11:000%2.8m/s
12:000%2.3m/s
13:000%4.6m/s
14:000%6.8m/s
15:000%9m/s
16:000%9.2m/s
17:000%9.3m/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
Sun, Feb 22 Sunrise 07:39 Sunset 17:39
19:00
2.8°C 5.7°C 5.3°C - 100% 0.14kPa
20:00
2.9°C 5.5°C 5.5°C - 100% 0.15kPa
21:00
2.9°C 5.3°C 5.4°C - 100% 0.15kPa
22:00
3°C 5.2°C 5.4°C - 100% 0.14kPa
23:00
2.8°C 5°C 5.5°C - 100% 0.16kPa
Mon, Feb 23 Sunrise 07:37 Sunset 17:41
24:00
3.5°C 4.9°C 5.1°C - 100% 0.1kPa
01:00
3.9°C 4.8°C 5.4°C - 100% 0.09kPa
02:00
4.2°C 4.8°C 5.8°C - 100% 0.09kPa
03:00
3.9°C 4.9°C 6°C - 89% 0.13kPa
04:00
4.1°C 4.9°C 6.2°C - 100% 0.13kPa
05:00
3.9°C 4.9°C 6°C - 100% 0.13kPa
06:00
4.2°C 4.9°C 6.2°C - 100% 0.12kPa
07:00
4°C 4.9°C 6.2°C - 98% 0.13kPa
08:00
4.2°C 4.9°C 5.9°C - 65% 0.1kPa
09:00
4.4°C 4.9°C 6.2°C - 8% 0.11kPa
10:00
5.1°C 5.1°C 7.1°C - 6% 0.13kPa
11:00
5.1°C 5.5°C 8.1°C - 43% 0.2kPa
12:00
4.8°C 6°C 8.7°C - 75% 0.26kPa
13:00
4.7°C 6.4°C 9°C - 86% 0.29kPa
14:00
4.6°C 6.8°C 8.9°C - 100% 0.29kPa
15:00
4.6°C 7°C 8.6°C - 58% 0.27kPa
16:00
4.8°C 7.1°C 8.4°C - 100% 0.24kPa
17:00
4.6°C 7°C 7.3°C - 99% 0.18kPa
18:00
4.3°C 6.8°C 6.5°C - 100% 0.14kPa
19:00
4.7°C 6.5°C 6.4°C - 100% 0.11kPa
20:00
5.2°C 6.3°C 6.3°C - 100% 0.07kPa
21:00
5.8°C 6.2°C 6.5°C - 100% 0.04kPa
22:00
5.7°C 6.1°C 6.8°C - 100% 0.07kPa
23:00
5.1°C 6.1°C 6.7°C - 100% 0.11kPa
Tue, Feb 24 Sunrise 07:34 Sunset 17:43
24:00
5.5°C 6°C 6.2°C - 100% 0.05kPa
01:00
5.4°C 6°C 6.1°C - 100% 0.04kPa
02:00
5.7°C 6°C 6.4°C - 100% 0.04kPa
03:00
6.5°C 6°C 7.1°C - 100% 0.04kPa
04:00
7.5°C 6.1°C 8.6°C - 100% 0.07kPa
05:00
7.3°C 6.3°C 8.8°C - 100% 0.11kPa
06:00
6.7°C 6.4°C 8.9°C - 100% 0.16kPa
07:00
6.6°C 6.6°C 8.8°C - 100% 0.15kPa
08:00
6.5°C 6.7°C 8.9°C - 100% 0.17kPa
09:00
6.7°C 6.8°C 9°C - 100% 0.17kPa
10:00
6.8°C 6.9°C 8.6°C - 100% 0.13kPa
11:00
6.7°C 7°C 8.6°C - 100% 0.13kPa
12:00
6.8°C 7°C 8.6°C - 100% 0.13kPa
13:00
6.9°C 7.1°C 8.6°C - 100% 0.12kPa
14:00
7.2°C 7.2°C 8.8°C - 100% 0.12kPa
15:00
7.2°C 7.3°C 8.8°C - 100% 0.12kPa
16:00
7.3°C 7.3°C 8.9°C - 100% 0.12kPa
17:00
7.6°C 7.4°C 9°C - 100% 0.1kPa
18:00
7.6°C 7.4°C 8.8°C - 100% 0.09kPa
19:00
7.7°C 7.5°C 9°C - 100% 0.09kPa
20:00
7.6°C 7.6°C 9.5°C - 100% 0.14kPa
21:00
7.8°C 7.6°C 9.3°C - 100% 0.11kPa
22:00
7.8°C 7.7°C 9.7°C - 100% 0.15kPa
23:00
7.9°C 7.8°C 9.8°C - 100% 0.15kPa
Wed, Feb 25 Sunrise 07:31 Sunset 17:46
24:00
7.8°C 7.9°C 9.8°C - 100% 0.15kPa
01:00
7.6°C 3247°C 9.1°C - 100% 0.11kPa
02:00
7.3°C 6487°C 8.4°C - 100% 0.08kPa
03:00
7°C 9726°C 7.7°C - 100% 0.05kPa
04:00
6.8°C 9726°C 7.5°C - 100% 0.05kPa
05:00
6.5°C 9726°C 7.3°C - 100% 0.05kPa
06:00
6.3°C 9726°C 7.2°C - 100% 0.06kPa
07:00
6.3°C 9726°C 7°C - 100% 0.05kPa
08:00
6.3°C 9726°C 6.9°C - 100% 0.04kPa
09:00
6.3°C 9726°C 6.7°C - 100% 0.03kPa
10:00
6.6°C 9726°C 6.9°C - 100% 0.02kPa
11:00
6.8°C 9726°C 7°C - 100% 0.01kPa
12:00
7.1°C 9726°C 7.2°C - 100% 0.01kPa
13:00
7.3°C 9726°C 7.7°C - 100% 0.02kPa
14:00
7.6°C 9726°C 8.2°C - 100% 0.04kPa
15:00
7.8°C 9726°C 8.7°C - 100% 0.06kPa
16:00
7.3°C 9726°C 8.3°C - 100% 0.07kPa
17:00
6.7°C 9726°C 8°C - 100% 0.08kPa
18:00
6.2°C 9726°C 7.6°C - 100% 0.1kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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