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Rule Morning Frost

Shetland Islands - Morning Frost - Scotland

Lerwick, 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 93% failing
Time Window 83% failing

Currently

Real-time conditions
Soil Temperature10.7°C
Dew Point4.1°C (low dew point)
Wind Speed6.1m/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
Sun, Jun 14
03:000%7.5m/s
04:000%7.7m/s
05:000%7.7m/s
06:000%8.1m/s
07:000%8.1m/s
08:000%8.7m/s
09:000%8.7m/s
10:000%8.4m/s
11:000%8.1m/s
12:000%7.9m/s
13:000%7.9m/s
14:000%7.8m/s
15:000%7.6m/s
16:000%7.5m/s
17:000%7.4m/s
18:000%7.3m/s
19:000%7.5m/s
20:000%7.1m/s
21:000%7m/s
22:000%6.8m/s
23:000%6.6m/s
Mon, Jun 15
24:000%6.5m/s
01:000%6.6m/s
02:000%6.4m/s
03:000%6.1m/s
04:000%6.2m/s
05:000%6m/s
06:000%5.7m/s
07:000%5.4m/s
08:000%5.3m/s
09:000%5.3m/s
10:000%5.1m/s
11:000%4.9m/s
12:000%4.7m/s
13:000%4.7m/s
14:000%4.3m/s
15:000%4.1m/s
16:000%4m/s
17:000%3.6m/s
18:000%3.6m/s
19:000%3.2m/s
20:000%3m/s
21:000%2.7m/s
22:000%2.4m/s
23:000%2.1m/s
Tue, Jun 16
24:000%2m/s
01:000%1.9m/s
02:000%1.7m/s
03:000%1.2m/s
04:000%0.92m/s
05:000%0.67m/s
06:000%0.67m/s
07:000%1.2m/s
08:000%1.9m/s
09:000%2.4m/s
10:000%3.2m/s
11:000%3.7m/s
12:000%4m/s
13:000%4.7m/s
14:000%4.8m/s
15:000%4.9m/s
16:000%5.1m/s
17:000%5.2m/s
18:000%5.5m/s
19:000%5.4m/s
20:000%5.3m/s
21:000%5.3m/s
22:000%5.8m/s
23:000%5.9m/s
Wed, Jun 17
24:000%6.3m/s
01:000%6.6m/s
02:000%6.7m/s
03:000%7.5m/s
04:000%8.1m/s
05:000%7.9m/s
06:000%7.9m/s
07:000%7.9m/s
08:000%7.7m/s
09:000%7.3m/s
10:000%6.6m/s
11:000%5.7m/s
12:000%4.9m/s
13:000%3.7m/s
14:000%4.5m/s
15:000%5.3m/s
16:000%6.1m/s
17:000%6.2m/s
18:000%6.2m/s
19:000%6.2m/s
20:000%6.3m/s
21:000%6.4m/s
22:000%6.4m/s
23:000%5.9m/s
Thu, Jun 18
24:000%5.4m/s
01:000%4.8m/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
Mon, Jun 15 Sunrise 03:39 Sunset 22:30
03:00
4.1°C 11°C 9°C - 100% 0.33kPa
04:00
3.8°C 11°C 9.2°C - 100% 0.36kPa
05:00
3.7°C 10°C 9.1°C - 100% 0.36kPa
06:00
3.7°C 10°C 9.3°C - 100% 0.37kPa
07:00
3.6°C 10°C 9.4°C - 100% 0.38kPa
08:00
3.6°C 10°C 9.5°C - 100% 0.4kPa
09:00
3.6°C 10°C 9.8°C - 100% 0.42kPa
10:00
3.6°C 10°C 10°C - 100% 0.43kPa
11:00
3.7°C 10°C 10°C - 100% 0.45kPa
12:00
3.8°C 10°C 11°C - 93% 0.48kPa
13:00
4°C 11°C 11°C - 86% 0.5kPa
14:00
4°C 11°C 11°C - 82% 0.5kPa
15:00
3.9°C 11°C 11°C - 80% 0.5kPa
16:00
3.9°C 11°C 11°C - 77% 0.5kPa
17:00
3.6°C 11°C 11°C - 87% 0.51kPa
18:00
3.5°C 11°C 11°C - 100% 0.48kPa
19:00
3.4°C 11°C 10°C - 99% 0.45kPa
20:00
3.1°C 11°C 9.6°C - 96% 0.43kPa
21:00
2.9°C 11°C 9.4°C - 100% 0.42kPa
22:00
2.6°C 11°C 9.2°C - 100% 0.42kPa
23:00
2.3°C 10°C 9°C - 95% 0.43kPa
Tue, Jun 16 Sunrise 03:39 Sunset 22:30
24:00
2.1°C 10°C 9°C - 100% 0.44kPa
01:00
1.9°C 10°C 8.9°C - 100% 0.44kPa
02:00
1.9°C 10°C 8.9°C - 100% 0.44kPa
03:00
2°C 10°C 8.8°C - 100% 0.43kPa
04:00
2.1°C 9.9°C 8.7°C - 100% 0.42kPa
05:00
2.8°C 9.7°C 9.1°C - 100% 0.41kPa
06:00
2.9°C 9.7°C 9.7°C - 100% 0.45kPa
07:00
2.6°C 9.7°C 10°C - 100% 0.51kPa
08:00
2.7°C 10°C 11°C - 80% 0.56kPa
09:00
3.2°C 10°C 11°C - 53% 0.58kPa
10:00
3.8°C 10°C 12°C - 72% 0.59kPa
11:00
4.2°C 10°C 12°C - 71% 0.54kPa
12:00
4.4°C 11°C 12°C - 65% 0.57kPa
13:00
4.7°C 11°C 12°C - 94% 0.54kPa
14:00
4.8°C 11°C 12°C - 30% 0.56kPa
15:00
4.8°C 12°C 12°C - 17% 0.58kPa
16:00
4.9°C 12°C 12°C - 37% 0.57kPa
17:00
5°C 12°C 12°C - 87% 0.54kPa
18:00
5°C 12°C 12°C - 100% 0.49kPa
19:00
5.2°C 12°C 11°C - 99% 0.45kPa
20:00
5.7°C 12°C 11°C - 100% 0.38kPa
21:00
5.8°C 12°C 10°C - 100% 0.34kPa
22:00
5.9°C 12°C 10°C - 100% 0.32kPa
23:00
5.9°C 11°C 10°C - 100% 0.32kPa
Wed, Jun 17 Sunrise 03:39 Sunset 22:31
24:00
6.3°C 11°C 10°C - 100% 0.3kPa
01:00
6.6°C 11°C 10°C - 100% 0.26kPa
02:00
6.8°C 11°C 10°C - 100% 0.25kPa
03:00
7°C 11°C 10°C - 100% 0.23kPa
04:00
7.7°C 11°C 9.6°C - 100% 0.14kPa
05:00
8.3°C 11°C 9.5°C - 100% 0.09kPa
06:00
8.6°C 11°C 9.7°C - 100% 0.08kPa
07:00
9.2°C 11°C 10°C - 100% 0.07kPa
08:00
9.7°C 10°C 10°C - 100% 0.06kPa
09:00
9.9°C 10°C 10°C - 100% 0.05kPa
10:00
10°C 10°C 11°C - 100% 0.03kPa
11:00
11°C 10°C 11°C - 100% 0.03kPa
12:00
11°C 10°C 11°C - 100% 0.02kPa
13:00
11°C 10°C 11°C - 100% 0.03kPa
14:00
11°C 3249°C 11°C - 100% 0.05kPa
15:00
11°C 6487°C 12°C - 100% 0.08kPa
16:00
11°C 9726°C 12°C - 100% 0.11kPa
17:00
11°C 9726°C 12°C - 68% 0.11kPa
18:00
11°C 9726°C 12°C - 37% 0.12kPa
19:00
11°C 9726°C 12°C - 5% 0.13kPa
20:00
11°C 9726°C 12°C - 37% 0.12kPa
21:00
11°C 9726°C 12°C - 68% 0.11kPa
22:00
11°C 9726°C 12°C - 100% 0.1kPa
23:00
11°C 9726°C 12°C - 100% 0.1kPa
Thu, Jun 18 Sunrise 03:39 Sunset 22:32
24:00
11°C 9726°C 12°C - 100% 0.09kPa
01:00
11°C 9726°C 12°C - 100% 0.08kPa
02:00
11°C 9726°C 12°C - 79% 0.08kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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