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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 85% failing

Currently

Real-time conditions
Soil Temperature10.3°C
Dew Point10.3°C (moderate dew point)
Wind Speed3.6m/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, May 23
14:000%11m/s
15:000%11m/s
16:000%11m/s
17:000%10m/s
18:000%7.3m/s
19:000%7.2m/s
20:000%7.5m/s
21:000%7.1m/s
22:000%7.1m/s
23:000%7.4m/s
Sun, May 24
24:000%7.3m/s
01:000%7.1m/s
02:000%6.7m/s
03:000%6.7m/s
04:000%6.8m/s
05:000%6.2m/s
06:000%5.3m/s
07:000%4.8m/s
08:000%4.3m/s
09:000%4.3m/s
10:000%3.6m/s
11:000%3.5m/s
12:000%3.3m/s
13:000%2.9m/s
14:000%3.6m/s
15:000%4m/s
16:000%4.2m/s
17:000%4.8m/s
18:000%5.7m/s
19:000%6m/s
20:000%5.4m/s
21:000%4.7m/s
22:000%4.6m/s
23:000%4.5m/s
Mon, May 25
24:000%4.5m/s
01:000%5.1m/s
02:000%5m/s
03:000%5.2m/s
04:000%5.5m/s
05:000%5.8m/s
06:000%5m/s
07:000%5.4m/s
08:000%5.8m/s
09:000%6.7m/s
10:000%6.1m/s
11:000%5.4m/s
12:000%4.9m/s
13:000%5.2m/s
14:000%6.1m/s
15:000%6.8m/s
16:000%8.1m/s
17:000%8.2m/s
18:000%9.1m/s
19:000%8.3m/s
20:000%8.1m/s
21:000%7.5m/s
22:000%6.9m/s
23:000%6.6m/s
Tue, May 26
24:000%6.3m/s
01:000%6.2m/s
02:000%6.3m/s
03:000%5.8m/s
04:000%6.2m/s
05:000%6m/s
06:000%5.8m/s
07:000%5.7m/s
08:000%6.1m/s
09:000%6m/s
10:000%5.6m/s
11:000%5.5m/s
12:000%5.4m/s
13:000%4.9m/s
14:000%4.5m/s
15:000%4.1m/s
16:000%3.8m/s
17:000%3.3m/s
18:000%2.9m/s
19:000%2.5m/s
20:000%2.4m/s
21:000%2.3m/s
22:000%2.2m/s
23:000%2.2m/s
Wed, May 27
24:000%2.2m/s
01:000%2.2m/s
02:000%2.3m/s
03:000%2.4m/s
04:000%2.5m/s
05:000%2.6m/s
06:000%2.7m/s
07:000%2.8m/s
08:000%2.8m/s
09:000%2.9m/s
10:000%2.9m/s
11:000%3.1m/s
12:000%3.4m/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, May 24 Sunrise 04:34 Sunset 21:58
14:00
10°C 10°C 11°C - 100% 0.08kPa
15:00
10°C 10°C 11°C - 100% 0.1kPa
16:00
10°C 10°C 12°C - 100% 0.12kPa
17:00
10°C 10°C 12°C - 100% 0.13kPa
18:00
10°C 10°C 12°C - 100% 0.15kPa
19:00
10°C 11°C 12°C - 100% 0.13kPa
20:00
11°C 11°C 12°C - 100% 0.13kPa
21:00
10°C 11°C 12°C - 100% 0.11kPa
22:00
11°C 11°C 12°C - 100% 0.09kPa
23:00
11°C 11°C 12°C - 100% 0.09kPa
Mon, May 25 Sunrise 04:34 Sunset 21:58
24:00
11°C 11°C 12°C - 100% 0.08kPa
01:00
11°C 11°C 12°C - 100% 0.09kPa
02:00
11°C 11°C 12°C - 100% 0.1kPa
03:00
11°C 11°C 12°C - 100% 0.11kPa
04:00
11°C 11°C 12°C - 100% 0.11kPa
05:00
11°C 11°C 12°C - 100% 0.1kPa
06:00
11°C 11°C 12°C - 100% 0.1kPa
07:00
11°C 11°C 12°C - 100% 0.09kPa
08:00
10°C 11°C 11°C - 100% 0.08kPa
09:00
10°C 11°C 11°C - 100% 0.08kPa
10:00
10°C 11°C 11°C - 100% 0.07kPa
11:00
10°C 11°C 11°C - 100% 0.07kPa
12:00
10°C 11°C 11°C - 100% 0.06kPa
13:00
10°C 11°C 11°C - 88% 0.07kPa
14:00
10°C 11°C 12°C - 100% 0.13kPa
15:00
10°C 11°C 12°C - 65% 0.17kPa
16:00
9.8°C 11°C 12°C - 64% 0.22kPa
17:00
9.3°C 11°C 12°C - 49% 0.27kPa
18:00
9.1°C 11°C 12°C - 5% 0.29kPa
19:00
8.7°C 11°C 12°C - 5% 0.29kPa
20:00
7.8°C 11°C 12°C - 5% 0.31kPa
21:00
7.2°C 11°C 11°C - 5% 0.28kPa
22:00
7.1°C 11°C 10°C - 5% 0.23kPa
23:00
7.2°C 11°C 9.7°C - 5% 0.19kPa
Tue, May 26 Sunrise 04:32 Sunset 22:00
24:00
7.4°C 10°C 9.5°C - 6% 0.15kPa
01:00
7.3°C 10°C 9.2°C - 7% 0.14kPa
02:00
7.4°C 10°C 9.1°C - 19% 0.12kPa
03:00
7.5°C 9.9°C 8.9°C - 31% 0.11kPa
04:00
7.5°C 9.7°C 8.9°C - 30% 0.1kPa
05:00
7.6°C 9.5°C 8.9°C - 34% 0.1kPa
06:00
7.6°C 9.4°C 9.1°C - 24% 0.11kPa
07:00
7.5°C 9.4°C 9.5°C - 8% 0.15kPa
08:00
6.7°C 9.4°C 9.9°C - 6% 0.24kPa
09:00
6.3°C 9.6°C 10°C - 5% 0.29kPa
10:00
6.1°C 9.9°C 11°C - 5% 0.34kPa
11:00
6°C 10°C 11°C - 12% 0.38kPa
12:00
5.8°C 11°C 11°C - 19% 0.41kPa
13:00
5.6°C 11°C 11°C - 9% 0.44kPa
14:00
5.6°C 11°C 12°C - 7% 0.46kPa
15:00
5.5°C 12°C 12°C - 71% 0.46kPa
16:00
5.3°C 12°C 11°C - 24% 0.46kPa
17:00
5.3°C 12°C 12°C - 21% 0.47kPa
18:00
5.2°C 13°C 11°C - 98% 0.45kPa
19:00
5.2°C 12°C 11°C - 76% 0.4kPa
20:00
5.5°C 3250°C 9.6°C - 52% 0.3kPa
21:00
5.6°C 6488°C 8.5°C - 29% 0.2kPa
22:00
5.6°C 9726°C 7.5°C - 5% 0.12kPa
23:00
5.8°C 9726°C 8°C - 5% 0.15kPa
Wed, May 27 Sunrise 04:30 Sunset 22:02
24:00
5.9°C 9726°C 8.5°C - 5% 0.18kPa
01:00
6°C 9726°C 9°C - 5% 0.21kPa
02:00
6.2°C 9726°C 10°C - 14% 0.28kPa
03:00
6.4°C 9726°C 11°C - 23% 0.35kPa
04:00
6.4°C 9726°C 12°C - 32% 0.44kPa
05:00
6.9°C 9726°C 13°C - 23% 0.48kPa
06:00
7.4°C 9726°C 14°C - 14% 0.52kPa
07:00
7.8°C 9726°C 14°C - 5% 0.56kPa
08:00
8.2°C 9726°C 15°C - 14% 0.6kPa
09:00
8.5°C 9726°C 15°C - 22% 0.64kPa
10:00
8.8°C 9726°C 16°C - 31% 0.69kPa
11:00
9.1°C 9726°C 16°C - 22% 0.67kPa
12:00
9.5°C 9726°C 16°C - 14% 0.66kPa
13:00
9.8°C 9726°C 16°C - 5% 0.65kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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