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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 85% failing
Wind Speed 64% failing

Currently

Real-time conditions
Soil Temperature9.9°C
Dew Point10.4°C (moderate dew point)
Wind Speed2.2m/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 79 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
Sun, May 24
06:000%2.2m/s
07:000%2.3m/s
08:000%2.2m/s
09:000%2.3m/s
10:000%2.5m/s
11:000%2.4m/s
12:000%2.6m/s
13:000%2.3m/s
14:000%2.2m/s
15:000%2.1m/s
16:000%1.9m/s
17:000%1.5m/s
18:000%1.8m/s
19:000%1.9m/s
20:000%2m/s
21:000%2.2m/s
22:000%2.3m/s
23:000%2.2m/s
Mon, May 25
24:000%2.1m/s
01:000%2.2m/s
02:000%2.5m/s
03:000%2.3m/s
04:000%2.2m/s
05:000%2.3m/s
06:000%2.3m/s
07:000%2.5m/s
08:000%2.8m/s
09:000%3m/s
10:000%3.5m/s
11:000%3.4m/s
12:000%2.8m/s
13:000%2.5m/s
14:000%2.4m/s
15:000%2.3m/s
16:000%2.1m/s
17:000%2m/s
18:000%2m/s
19:000%2.2m/s
20:000%2m/s
21:000%1.9m/s
22:000%1.9m/s
23:000%1.8m/s
Tue, May 26
24:000%1.6m/s
01:000%1.7m/s
02:000%1.6m/s
03:000%1.3m/s
04:000%1.3m/s
05:000%1.2m/s
06:000%1m/s
07:000%0.96m/s
08:000%1.3m/s
09:000%1.5m/s
10:000%1.5m/s
11:000%1.4m/s
12:000%1.4m/s
13:000%1.4m/s
14:000%1.4m/s
15:000%1.4m/s
16:000%1.7m/s
17:000%1.7m/s
18:000%1.4m/s
19:000%1.4m/s
20:000%1.5m/s
21:000%1.6m/s
22:000%1.8m/s
23:000%1.6m/s
Wed, May 27
24:000%1.5m/s
01:000%1.4m/s
02:000%1.3m/s
03:000%1.1m/s
04:000%0.9m/s
05:000%0.68m/s
06:000%0.46m/s
07:000%0.24m/s
08:000%0.5m/s
09:000%0.76m/s
10:000%1m/s
11:000%0.98m/s
12:000%0.95m/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 04:47 Sunset 21:47
14:00
10°C 9.9°C 11°C - 100% 0.05kPa
15:00
11°C 10°C 11°C - 99% 0.06kPa
16:00
11°C 10°C 12°C - 99% 0.09kPa
17:00
11°C 10°C 12°C - 98% 0.1kPa
18:00
11°C 10°C 12°C - 100% 0.1kPa
19:00
11°C 10°C 12°C - 100% 0.08kPa
20:00
11°C 10°C 12°C - 100% 0.06kPa
21:00
11°C 10°C 11°C - 100% 0.06kPa
22:00
10°C 10°C 11°C - 100% 0.06kPa
23:00
10°C 10°C 11°C - 100% 0.06kPa
Mon, May 25 Sunrise 04:47 Sunset 21:47
24:00
10°C 10°C 11°C - 83% 0.07kPa
01:00
9.8°C 10°C 11°C - 71% 0.07kPa
02:00
9.3°C 10°C 10°C - 94% 0.06kPa
03:00
9.4°C 10°C 10°C - 92% 0.06kPa
04:00
9.2°C 10°C 10°C - 32% 0.06kPa
05:00
8.3°C 10°C 9°C - 14% 0.05kPa
06:00
8.8°C 9.8°C 9.5°C - 25% 0.05kPa
07:00
9.8°C 9.9°C 11°C - 97% 0.11kPa
08:00
10°C 10°C 12°C - 100% 0.12kPa
09:00
10°C 10°C 12°C - 100% 0.12kPa
10:00
10°C 10°C 12°C - 97% 0.15kPa
11:00
10°C 10°C 13°C - 99% 0.21kPa
12:00
10°C 10°C 12°C - 100% 0.19kPa
13:00
10°C 10°C 12°C - 100% 0.18kPa
14:00
10°C 10°C 12°C - 100% 0.15kPa
15:00
10°C 10°C 12°C - 100% 0.12kPa
16:00
11°C 10°C 11°C - 100% 0.08kPa
17:00
11°C 10°C 11°C - 100% 0.04kPa
18:00
11°C 10°C 11°C - 91% 0.05kPa
19:00
11°C 10°C 12°C - 98% 0.07kPa
20:00
11°C 11°C 12°C - 66% 0.05kPa
21:00
11°C 11°C 11°C - 86% 0.03kPa
22:00
10°C 10°C 10°C - 85% 0.02kPa
23:00
9.8°C 10°C 10°C - 24% 0.02kPa
Tue, May 26 Sunrise 04:46 Sunset 21:49
24:00
8.7°C 10°C 9°C - 27% 0.02kPa
01:00
8.4°C 10°C 8.6°C - 27% 0.02kPa
02:00
7.9°C 9.9°C 8.2°C - 24% 0.02kPa
03:00
7.5°C 9.7°C 7.8°C - 98% 0.02kPa
04:00
8.4°C 9.6°C 8.9°C - 60% 0.03kPa
05:00
7.5°C 9.4°C 8.1°C - 29% 0.04kPa
06:00
7.6°C 9.3°C 8.4°C - 39% 0.06kPa
07:00
8°C 9.3°C 9.9°C - 29% 0.15kPa
08:00
7.8°C 9.5°C 11°C - 67% 0.29kPa
09:00
7.7°C 9.6°C 13°C - 22% 0.41kPa
10:00
7.5°C 10°C 14°C - 100% 0.58kPa
11:00
7°C 10°C 14°C - 54% 0.6kPa
12:00
6.8°C 11°C 16°C - 78% 0.83kPa
13:00
7.1°C 12°C 17°C - 28% 0.95kPa
14:00
7.5°C 12°C 18°C - 5% 1kPa
15:00
7.6°C 13°C 19°C - 6% 1.1kPa
16:00
7.5°C 13°C 19°C - 54% 1.1kPa
17:00
7.5°C 14°C 19°C - 100% 1.1kPa
18:00
7.6°C 14°C 18°C - 87% 1kPa
19:00
8.1°C 14°C 18°C - 64% 0.92kPa
20:00
7.7°C 13°C 14°C - 76% 0.53kPa
21:00
6.7°C 12°C 10°C - 88% 0.26kPa
22:00
5.3°C 11°C 6.6°C - 100% 0.08kPa
23:00
5.8°C 11°C 7.4°C - 100% 0.11kPa
Wed, May 27 Sunrise 04:44 Sunset 21:51
24:00
6.3°C 10°C 8.3°C - 100% 0.14kPa
01:00
6.8°C 10°C 9.2°C - 100% 0.17kPa
02:00
7.9°C 10°C 11°C - 70% 0.28kPa
03:00
8.9°C 11°C 14°C - 40% 0.41kPa
04:00
9.7°C 11°C 16°C - 9% 0.59kPa
05:00
10°C 12°C 17°C - 14% 0.77kPa
06:00
10°C 12°C 19°C - 19% 0.98kPa
07:00
10°C 13°C 21°C - 23% 1.2kPa
08:00
10°C 14°C 21°C - 25% 1.3kPa
09:00
11°C 14°C 22°C - 28% 1.3kPa
10:00
11°C 15°C 22°C - 30% 1.4kPa
11:00
11°C 15°C 22°C - 47% 1.2kPa
12:00
12°C 16°C 21°C - 63% 1.1kPa
13:00
12°C 16°C 20°C - 80% 0.97kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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