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Rule Morning Frost

Orkney Islands - Morning Frost - Scotland

Kirkwall, 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 92% failing
Time Window 88% failing

Currently

Real-time conditions
Soil Temperature9725.9°C
Dew Point8.5°C (moderate dew point)
Wind Speed4.3m/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%8m/s
15:000%7.8m/s
16:000%8.3m/s
17:000%8.5m/s
18:000%8.1m/s
19:000%7.2m/s
20:000%6.6m/s
21:000%5.9m/s
22:000%6.2m/s
23:000%7.2m/s
Sun, May 24
24:000%7.4m/s
01:000%7.4m/s
02:000%6.8m/s
03:000%6.5m/s
04:000%6.6m/s
05:000%7.3m/s
06:000%6.3m/s
07:000%5.2m/s
08:000%5.5m/s
09:000%5.1m/s
10:000%3m/s
11:000%4.3m/s
12:000%4.7m/s
13:000%4.4m/s
14:000%4.3m/s
15:000%4m/s
16:000%3.9m/s
17:000%2.8m/s
18:000%3m/s
19:000%5m/s
20:000%6.2m/s
21:000%5.5m/s
22:000%5m/s
23:000%4.8m/s
Mon, May 25
24:000%4.2m/s
01:000%2.8m/s
02:000%2.7m/s
03:000%3.3m/s
04:000%3.1m/s
05:000%1.1m/s
06:000%3.3m/s
07:000%5.7m/s
08:000%6.1m/s
09:000%3.6m/s
10:000%7.5m/s
11:000%4.9m/s
12:000%4.8m/s
13:000%4.6m/s
14:000%5.7m/s
15:000%5.4m/s
16:000%5.2m/s
17:000%5.9m/s
18:000%7.7m/s
19:000%9.7m/s
20:000%10m/s
21:000%9.5m/s
22:000%9.8m/s
23:000%9.8m/s
Tue, May 26
24:000%10m/s
01:000%10m/s
02:000%11m/s
03:000%11m/s
04:000%11m/s
05:000%11m/s
06:000%11m/s
07:000%10m/s
08:000%10m/s
09:000%10m/s
10:000%9.8m/s
11:000%9.3m/s
12:000%9m/s
13:000%8.4m/s
14:000%7.9m/s
15:000%7.4m/s
16:000%6.9m/s
17:000%6.4m/s
18:000%5.7m/s
19:000%5.3m/s
20:000%3.9m/s
21:000%2.5m/s
22:000%1.1m/s
23:000%0.96m/s
Wed, May 27
24:000%0.87m/s
01:000%0.77m/s
02:000%1.2m/s
03:000%1.6m/s
04:000%2m/s
05:000%2.7m/s
06:000%3.4m/s
07:000%4m/s
08:000%4.4m/s
09:000%4.8m/s
10:000%5.2m/s
11:000%5.6m/s
12:000%6m/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 04:23 Sunset 21:54
14:00
8.5°C 9726°C 10°C - 100% 0.12kPa
15:00
8.5°C 9726°C 9.9°C - 100% 0.11kPa
16:00
8.9°C 9726°C 10°C - 100% 0.09kPa
17:00
9.3°C 9726°C 10°C - 100% 0.06kPa
18:00
9.4°C 9726°C 10°C - 100% 0.06kPa
19:00
9.3°C 9726°C 10°C - 100% 0.07kPa
20:00
9.1°C 9726°C 10°C - 100% 0.08kPa
21:00
9.3°C 9726°C 10°C - 100% 0.08kPa
22:00
10°C 9726°C 11°C - 100% 0.08kPa
23:00
10°C 9726°C 11°C - 100% 0.09kPa
Mon, May 25 Sunrise 04:23 Sunset 21:54
24:00
10°C 9726°C 11°C - 100% 0.08kPa
01:00
10°C 9726°C 11°C - 100% 0.05kPa
02:00
9.8°C 9726°C 10°C - 100% 0.03kPa
03:00
9.9°C 9726°C 10°C - 100% 0.01kPa
04:00
9.9°C 9726°C 10°C - 100% 0.01kPa
05:00
9.8°C 9726°C 9.9°C - 100% 0.01kPa
06:00
9.9°C 9726°C 10°C - 100% 0.01kPa
07:00
9.8°C 9726°C 10°C - 100% 0.01kPa
08:00
9.8°C 9726°C 10°C - 100% 0.01kPa
09:00
9.8°C 9726°C 10°C - 100% 0.02kPa
10:00
9.7°C 9726°C 10°C - 100% 0.05kPa
11:00
9.3°C 9726°C 10°C - 99% 0.06kPa
12:00
9.4°C 9726°C 10°C - 100% 0.05kPa
13:00
9.7°C 9726°C 10°C - 100% 0.04kPa
14:00
9.8°C 9726°C 10°C - 98% 0.05kPa
15:00
9.8°C 9726°C 10°C - 100% 0.06kPa
16:00
9.8°C 9726°C 11°C - 100% 0.08kPa
17:00
9.8°C 9726°C 11°C - 86% 0.12kPa
18:00
9.3°C 9726°C 11°C - 22% 0.15kPa
19:00
9°C 9726°C 11°C - 5% 0.19kPa
20:00
8.7°C 9726°C 11°C - 95% 0.2kPa
21:00
8.5°C 9726°C 11°C - 29% 0.19kPa
22:00
8.2°C 9726°C 11°C - 45% 0.21kPa
23:00
8°C 9726°C 11°C - 86% 0.2kPa
Tue, May 26 Sunrise 04:22 Sunset 21:56
24:00
8°C 9726°C 10°C - 96% 0.19kPa
01:00
8°C 9726°C 10°C - 94% 0.18kPa
02:00
8.1°C 9726°C 10°C - 98% 0.16kPa
03:00
8.3°C 9726°C 10°C - 98% 0.14kPa
04:00
8.4°C 9726°C 10°C - 98% 0.12kPa
05:00
8.5°C 9726°C 9.9°C - 100% 0.11kPa
06:00
8.3°C 9726°C 9.8°C - 87% 0.12kPa
07:00
8°C 9726°C 9.7°C - 88% 0.13kPa
08:00
7.8°C 9726°C 9.6°C - 79% 0.14kPa
09:00
7.8°C 9726°C 9.6°C - 56% 0.14kPa
10:00
7.8°C 9726°C 9.6°C - 87% 0.14kPa
11:00
7.8°C 9726°C 9.6°C - 37% 0.13kPa
12:00
7.9°C 9726°C 9.6°C - 69% 0.13kPa
13:00
7.9°C 9726°C 9.6°C - 26% 0.13kPa
14:00
7.9°C 9726°C 9.6°C - 5% 0.13kPa
15:00
7.9°C 9726°C 9.6°C - 58% 0.13kPa
16:00
7.9°C 9726°C 9.6°C - 5% 0.13kPa
17:00
8°C 9726°C 9.6°C - 69% 0.12kPa
18:00
8.1°C 9726°C 9.6°C - 5% 0.12kPa
19:00
8°C 9726°C 9.5°C - 5% 0.12kPa
20:00
7.5°C 9726°C 9.4°C - 8% 0.15kPa
21:00
6.9°C 9726°C 9.3°C - 12% 0.17kPa
22:00
6.3°C 9726°C 9.1°C - 15% 0.2kPa
23:00
6.2°C 9726°C 9.2°C - 12% 0.21kPa
Wed, May 27 Sunrise 04:20 Sunset 21:58
24:00
6.1°C 9726°C 9.2°C - 8% 0.22kPa
01:00
5.9°C 9726°C 9.2°C - 5% 0.23kPa
02:00
5.8°C 9726°C 9.2°C - 20% 0.24kPa
03:00
5.7°C 9726°C 9.3°C - 34% 0.26kPa
04:00
5.5°C 9726°C 9.4°C - 49% 0.27kPa
05:00
5.6°C 9726°C 9.5°C - 47% 0.28kPa
06:00
5.6°C 9726°C 9.6°C - 46% 0.29kPa
07:00
5.6°C 9726°C 9.7°C - 44% 0.29kPa
08:00
5.8°C 9726°C 9.8°C - 43% 0.29kPa
09:00
6°C 9726°C 9.9°C - 41% 0.29kPa
10:00
6.2°C 9726°C 10°C - 39% 0.28kPa
11:00
6.4°C 9726°C 10°C - 30% 0.27kPa
12:00
6.6°C 9726°C 10°C - 21% 0.25kPa
13:00
6.8°C 9726°C 10°C - 12% 0.23kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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