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Rule Morning Frost

Glencoe - Morning Frost - Scotland

Fort William, 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
Time Window 88% failing
Wind Speed 88% failing

Currently

Real-time conditions
Soil Temperature3.6°C
Dew Point1.9°C (low dew point)
Wind Speed4.1m/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
Sat, Feb 21
19:0022%2.1m/s
20:0022%2.2m/s
21:0022%2.2m/s
22:0020%3.2m/s
23:0020%2.9m/s
Sun, Feb 22
24:0020%3.1m/s
01:0020%3.5m/s
02:0020%3.7m/s
03:0020%3.9m/s
04:0020%3.6m/s
05:0020%3.7m/s
06:0020%4.1m/s
07:0020%3.6m/s
08:0022%4.3m/s
09:0028%4m/s
10:0032%4.2m/s
11:0022%5m/s
12:0017%5.8m/s
13:0033%5.2m/s
14:0026%5.4m/s
15:0018%4.7m/s
16:0013%3.1m/s
17:0013%3.1m/s
18:0013%3.8m/s
19:0017%4.1m/s
20:0017%3.7m/s
21:0013%3.7m/s
22:0013%3.3m/s
23:0013%2.9m/s
Mon, Feb 23
24:0015%2.5m/s
01:0013%3m/s
02:0011%5.2m/s
03:0011%4.9m/s
04:0011%5m/s
05:0011%4.4m/s
06:0013%4.1m/s
07:0013%4m/s
08:0017%3.8m/s
09:0013%4m/s
10:0013%3.8m/s
11:0017%3.8m/s
12:0018%4.3m/s
13:0020%3.8m/s
14:0018%3.2m/s
15:0020%2.5m/s
16:0017%2.1m/s
17:0013%2.4m/s
18:0013%2.4m/s
19:0013%2.2m/s
20:0013%2.1m/s
21:0013%1.9m/s
22:0013%1.9m/s
23:0015%1.8m/s
Tue, Feb 24
24:0015%1.9m/s
01:0015%1.9m/s
02:0015%1.9m/s
03:0015%1.9m/s
04:0015%2.2m/s
05:0015%2.1m/s
06:0015%2.1m/s
07:0015%2.4m/s
08:0015%2.5m/s
09:0013%2.5m/s
10:0013%2.6m/s
11:0013%2.4m/s
12:0013%2.2m/s
13:0013%2.2m/s
14:0013%1.7m/s
15:0013%2.2m/s
16:0013%2.1m/s
17:0013%2m/s
18:0013%2.2m/s
19:0013%2m/s
20:0013%2.1m/s
21:0013%1.9m/s
22:0013%1.9m/s
23:0013%1.9m/s
Wed, Feb 25
24:0013%1.8m/s
01:0015%1.6m/s
02:0015%1.4m/s
03:0015%1.2m/s
04:0015%1.2m/s
05:0015%1.3m/s
06:0015%1.3m/s
07:0015%1.3m/s
08:0015%1.4m/s
09:0015%1.4m/s
10:0015%1.5m/s
11:0015%1.5m/s
12:0015%1.6m/s
13:0015%1.6m/s
14:0015%1.6m/s
15:0015%1.6m/s
16:0013%1.8m/s
17:0013%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
Sun, Feb 22 Sunrise 07:31 Sunset 17:37
19:00
1.9°C 3.6°C 3.1°C - 100% 0.07kPa
20:00
1.9°C 3.5°C 3.2°C - 100% 0.07kPa
21:00
2.3°C 3.4°C 2.9°C - 100% 0.03kPa
22:00
2.4°C 3.4°C 2.6°C - 100% 0.01kPa
23:00
1.9°C 3.3°C 2°C - 100% 0kPa
Mon, Feb 23 Sunrise 07:28 Sunset 17:39
24:00
2.4°C 3.2°C 2.5°C - 100% 0.01kPa
01:00
3°C 3.2°C 3.1°C - 100% 0.01kPa
02:00
3.5°C 3.3°C 3.9°C - 100% 0.02kPa
03:00
3.5°C 3.3°C 3.8°C - 100% 0.02kPa
04:00
3.1°C 3.3°C 3.9°C - 100% 0.04kPa
05:00
3°C 3.3°C 3.8°C - 100% 0.04kPa
06:00
3.1°C 3.4°C 3.6°C - 100% 0.03kPa
07:00
3.3°C 3.4°C 3.7°C - 100% 0.02kPa
08:00
2.8°C 3.4°C 3.9°C - 100% 0.06kPa
09:00
3.3°C 3.4°C 3.8°C - 100% 0.03kPa
10:00
3.7°C 3.4°C 4.1°C - 100% 0.03kPa
11:00
3.6°C 3.5°C 4.6°C - 100% 0.06kPa
12:00
3.4°C 3.7°C 5.3°C - 100% 0.12kPa
13:00
3.8°C 3.8°C 5.8°C - 100% 0.12kPa
14:00
3.8°C 4°C 5.9°C - 100% 0.13kPa
15:00
3.8°C 4.2°C 5.9°C - 100% 0.13kPa
16:00
4°C 4.3°C 5.5°C - 100% 0.09kPa
17:00
4.2°C 4.4°C 5°C - 100% 0.05kPa
18:00
4.2°C 4.3°C 4.6°C - 89% 0.02kPa
19:00
3.5°C 4.2°C 4°C - 100% 0.03kPa
20:00
3.3°C 4.2°C 3.9°C - 100% 0.03kPa
21:00
3.1°C 4.1°C 3.7°C - 100% 0.03kPa
22:00
3.4°C 4°C 3.8°C - 100% 0.03kPa
23:00
3.2°C 4°C 3.7°C - 100% 0.03kPa
Tue, Feb 24 Sunrise 07:26 Sunset 17:41
24:00
3.1°C 4°C 3.6°C - 100% 0.03kPa
01:00
3.2°C 3.9°C 3.6°C - 100% 0.02kPa
02:00
3.2°C 3.9°C 3.7°C - 100% 0.03kPa
03:00
3.2°C 3.9°C 3.8°C - 100% 0.03kPa
04:00
3.4°C 3.9°C 3.9°C - 100% 0.03kPa
05:00
3.7°C 3.8°C 4.1°C - 100% 0.02kPa
06:00
4°C 3.8°C 4.4°C - 100% 0.02kPa
07:00
4.3°C 3.9°C 4.6°C - 100% 0.02kPa
08:00
4.7°C 3.9°C 4.9°C - 100% 0.01kPa
09:00
4.9°C 4°C 5.4°C - 100% 0.03kPa
10:00
4.9°C 4.1°C 5.4°C - 100% 0.03kPa
11:00
5°C 4.3°C 5.6°C - 100% 0.03kPa
12:00
4.8°C 4.3°C 5.2°C - 100% 0.02kPa
13:00
4.9°C 4.4°C 5.2°C - 100% 0.02kPa
14:00
4.9°C 4.5°C 5.2°C - 100% 0.02kPa
15:00
5.1°C 4.6°C 5.4°C - 100% 0.02kPa
16:00
5.3°C 4.6°C 5.6°C - 100% 0.01kPa
17:00
5.5°C 4.7°C 5.7°C - 100% 0.01kPa
18:00
5.5°C 4.7°C 5.6°C - 100% 0.01kPa
19:00
5.5°C 4.7°C 5.7°C - 100% 0.01kPa
20:00
5.4°C 4.8°C 5.6°C - 100% 0.01kPa
21:00
5.4°C 4.8°C 5.6°C - 100% 0.01kPa
22:00
5.4°C 4.9°C 5.6°C - 100% 0.01kPa
23:00
5.4°C 4.9°C 5.6°C - 100% 0.01kPa
Wed, Feb 25 Sunrise 07:23 Sunset 17:44
24:00
5.5°C 4.9°C 5.7°C - 100% 0.01kPa
01:00
5.6°C 4.9°C 5.8°C - 100% 0.01kPa
02:00
5.6°C 5°C 5.9°C - 100% 0.02kPa
03:00
5.7°C 5°C 6.1°C - 100% 0.02kPa
04:00
5.8°C 5.1°C 6.2°C - 100% 0.03kPa
05:00
5.9°C 5.1°C 6.4°C - 100% 0.03kPa
06:00
6°C 5.2°C 6.6°C - 100% 0.04kPa
07:00
6.1°C 5.2°C 6.6°C - 100% 0.03kPa
08:00
6.2°C 5.3°C 6.7°C - 100% 0.03kPa
09:00
6.3°C 5.4°C 6.7°C - 100% 0.02kPa
10:00
6.3°C 5.4°C 6.6°C - 100% 0.02kPa
11:00
6.2°C 5.4°C 6.4°C - 100% 0.02kPa
12:00
6.1°C 5.4°C 6.3°C - 100% 0.01kPa
13:00
6.1°C 5.4°C 6.3°C - 100% 0.01kPa
14:00
6.2°C 5.4°C 6.3°C - 100% 0.01kPa
15:00
6.2°C 5.4°C 6.4°C - 100% 0.01kPa
16:00
6.3°C 5.5°C 6.4°C - 100% 0.01kPa
17:00
6.3°C 5.5°C 6.5°C - 100% 0.01kPa
18:00
6.4°C 5.5°C 6.6°C - 100% 0.01kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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