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Rule Morning Frost

Cairngorms - Morning Frost - Scotland

Aviemore, 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 Temperature12.6°C
Dew Point9.5°C (moderate dew point)
Wind Speed5.8m/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, May 23
14:000%5.8m/s
15:000%5.9m/s
16:000%5.6m/s
17:000%5.5m/s
18:000%4.9m/s
19:000%4.5m/s
20:000%3.6m/s
21:000%2.6m/s
22:000%2.3m/s
23:000%2.3m/s
Sun, May 24
24:000%2.3m/s
01:000%2.6m/s
02:000%2.6m/s
03:000%2.6m/s
04:000%2.5m/s
05:000%2.9m/s
06:000%3.4m/s
07:000%3.4m/s
08:000%4.1m/s
09:000%4.8m/s
10:000%5.3m/s
11:000%5.5m/s
12:000%5.3m/s
13:000%5.4m/s
14:000%5.8m/s
15:000%5.6m/s
16:000%5.3m/s
17:000%4.6m/s
18:000%3.7m/s
19:000%3.2m/s
20:000%3m/s
21:000%2.4m/s
22:000%2.4m/s
23:000%2.7m/s
Mon, May 25
24:000%2.9m/s
01:000%2.9m/s
02:000%3m/s
03:000%3.1m/s
04:000%3.2m/s
05:000%3.2m/s
06:000%3m/s
07:000%3.6m/s
08:000%4.7m/s
09:000%5.6m/s
10:000%5.4m/s
11:000%4.9m/s
12:000%4.2m/s
13:000%3.7m/s
14:000%3.4m/s
15:000%3.2m/s
16:000%3.3m/s
17:000%3.2m/s
18:000%4.5m/s
19:000%4.5m/s
20:000%3.6m/s
21:000%2.9m/s
22:000%2.3m/s
23:000%2.3m/s
Tue, May 26
24:000%2.5m/s
01:000%2.5m/s
02:000%2.5m/s
03:000%2.4m/s
04:000%2.4m/s
05:000%2.3m/s
06:000%2m/s
07:000%1.8m/s
08:000%1.8m/s
09:000%2.1m/s
10:000%2.4m/s
11:000%2.5m/s
12:000%2.5m/s
13:000%2.5m/s
14:000%2.9m/s
15:000%3.2m/s
16:000%2.8m/s
17:000%2.1m/s
18:000%1.7m/s
19:000%2.7m/s
20:000%2.5m/s
21:000%2.4m/s
22:000%2.3m/s
23:000%2.2m/s
Wed, May 27
24:000%2.1m/s
01:000%2m/s
02:000%2m/s
03:000%2.1m/s
04:000%2.2m/s
05:000%2.3m/s
06:000%2.5m/s
07:000%2.6m/s
08:000%2.9m/s
09:000%3.2m/s
10:000%3.4m/s
11:000%3.3m/s
12:000%3.1m/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 04:40 Sunset 21:45
14:00
9.5°C 13°C 17°C - 100% 0.76kPa
15:00
9.4°C 13°C 17°C - 100% 0.71kPa
16:00
9.3°C 13°C 17°C - 100% 0.72kPa
17:00
9.1°C 13°C 15°C - 100% 0.57kPa
18:00
8.9°C 13°C 14°C - 100% 0.47kPa
19:00
8.8°C 13°C 14°C - 100% 0.46kPa
20:00
9.3°C 13°C 15°C - 100% 0.5kPa
21:00
9.6°C 13°C 13°C - 50% 0.33kPa
22:00
9.5°C 13°C 12°C - 18% 0.24kPa
23:00
9.4°C 13°C 11°C - 15% 0.16kPa
Mon, May 25 Sunrise 04:40 Sunset 21:45
24:00
9.3°C 12°C 11°C - 4% 0.14kPa
01:00
9.2°C 12°C 11°C - 4% 0.12kPa
02:00
9.3°C 12°C 10°C - 4% 0.09kPa
03:00
9.1°C 12°C 10°C - 100% 0.08kPa
04:00
9°C 12°C 10°C - 100% 0.08kPa
05:00
8.9°C 11°C 9.9°C - 92% 0.08kPa
06:00
9.1°C 11°C 11°C - 17% 0.14kPa
07:00
9.2°C 11°C 13°C - 27% 0.31kPa
08:00
8.8°C 11°C 15°C - 100% 0.55kPa
09:00
9.2°C 12°C 16°C - 91% 0.67kPa
10:00
9.5°C 12°C 17°C - 79% 0.75kPa
11:00
9.7°C 12°C 17°C - 99% 0.71kPa
12:00
9.9°C 12°C 16°C - 100% 0.58kPa
13:00
10°C 13°C 15°C - 100% 0.5kPa
14:00
10°C 13°C 15°C - 100% 0.45kPa
15:00
10°C 13°C 15°C - 100% 0.43kPa
16:00
10°C 13°C 15°C - 100% 0.41kPa
17:00
10°C 13°C 14°C - 93% 0.37kPa
18:00
9.7°C 13°C 15°C - 56% 0.47kPa
19:00
9°C 13°C 15°C - 7% 0.53kPa
20:00
9°C 13°C 14°C - 5% 0.48kPa
21:00
8.9°C 13°C 13°C - 5% 0.31kPa
22:00
8.8°C 13°C 10°C - 7% 0.13kPa
23:00
8.8°C 12°C 9.6°C - 20% 0.07kPa
Tue, May 26 Sunrise 04:38 Sunset 21:47
24:00
8.6°C 12°C 9.3°C - 30% 0.05kPa
01:00
8.4°C 12°C 9°C - 5% 0.05kPa
02:00
8.1°C 11°C 8.8°C - 38% 0.05kPa
03:00
7.7°C 11°C 8.4°C - 23% 0.05kPa
04:00
7.5°C 11°C 8.2°C - 29% 0.06kPa
05:00
7.1°C 11°C 8°C - 6% 0.07kPa
06:00
7.1°C 10°C 9°C - 28% 0.14kPa
07:00
6.9°C 10°C 11°C - 89% 0.35kPa
08:00
6.2°C 10°C 12°C - 40% 0.45kPa
09:00
4.8°C 11°C 14°C - 52% 0.76kPa
10:00
3.9°C 11°C 16°C - 58% 0.96kPa
11:00
3.7°C 11°C 17°C - 75% 1.1kPa
12:00
4°C 12°C 17°C - 32% 1.1kPa
13:00
4.3°C 12°C 18°C - 34% 1.3kPa
14:00
4.5°C 13°C 19°C - 60% 1.3kPa
15:00
4.8°C 13°C 19°C - 76% 1.3kPa
16:00
5°C 14°C 18°C - 97% 1.2kPa
17:00
5.4°C 14°C 17°C - 86% 1.1kPa
18:00
5.7°C 14°C 17°C - 57% 1kPa
19:00
6.7°C 14°C 16°C - 18% 0.84kPa
20:00
6.5°C 13°C 13°C - 45% 0.55kPa
21:00
6°C 12°C 10°C - 72% 0.33kPa
22:00
5.1°C 12°C 7.6°C - 99% 0.17kPa
23:00
5.2°C 11°C 7.9°C - 99% 0.18kPa
Wed, May 27 Sunrise 04:37 Sunset 21:48
24:00
5.2°C 11°C 8.1°C - 100% 0.19kPa
01:00
5.2°C 11°C 8.3°C - 100% 0.21kPa
02:00
6°C 11°C 10°C - 96% 0.29kPa
03:00
6.7°C 11°C 12°C - 92% 0.4kPa
04:00
7.3°C 11°C 14°C - 87% 0.53kPa
05:00
7.8°C 12°C 15°C - 64% 0.63kPa
06:00
8.2°C 12°C 16°C - 40% 0.75kPa
07:00
8.5°C 13°C 18°C - 17% 0.89kPa
08:00
8.9°C 13°C 18°C - 21% 0.89kPa
09:00
9.3°C 14°C 18°C - 25% 0.89kPa
10:00
9.6°C 14°C 18°C - 29% 0.89kPa
11:00
9.8°C 14°C 17°C - 21% 0.79kPa
12:00
9.9°C 14°C 17°C - 13% 0.69kPa
13:00
10°C 15°C 16°C - 5% 0.6kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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