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Rule Morning Frost

Isle of Skye - Morning Frost - Scotland

Portree, 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 88% failing
Time Window 86% failing

Currently

Real-time conditions
Soil Temperature10.2°C
Dew Point10.5°C (moderate dew point)
Wind Speed5.1m/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
Sat, May 23
14:000%6.8m/s
15:000%6.9m/s
16:000%6.6m/s
17:000%6.4m/s
18:000%5.8m/s
19:000%6m/s
20:000%5.8m/s
21:000%6m/s
22:000%6.3m/s
23:000%5.9m/s
Sun, May 24
24:000%5.5m/s
01:000%5.5m/s
02:000%6.2m/s
03:000%5.3m/s
04:000%4.6m/s
05:000%4.4m/s
06:000%4.4m/s
07:000%4.1m/s
08:000%4.5m/s
09:000%4.5m/s
10:000%4.2m/s
11:000%4.2m/s
12:000%4.8m/s
13:000%5.2m/s
14:000%5.1m/s
15:000%5.4m/s
16:000%5.3m/s
17:000%5.4m/s
18:000%4.9m/s
19:000%4.7m/s
20:000%4.6m/s
21:000%4.6m/s
22:000%4.9m/s
23:000%4.9m/s
Mon, May 25
24:000%4.8m/s
01:000%4.9m/s
02:000%4.9m/s
03:000%5.1m/s
04:000%5m/s
05:000%5.1m/s
06:000%4.9m/s
07:000%4.8m/s
08:000%4.2m/s
09:000%3.6m/s
10:000%3.4m/s
11:000%3.5m/s
12:000%3.5m/s
13:000%3.7m/s
14:000%3.8m/s
15:000%3.9m/s
16:000%3.7m/s
17:000%5.1m/s
18:000%5.3m/s
19:000%4.7m/s
20:000%3.6m/s
21:000%2.7m/s
22:000%2.6m/s
23:000%2.6m/s
Tue, May 26
24:000%2.4m/s
01:000%2.2m/s
02:000%2.1m/s
03:000%2m/s
04:000%1.8m/s
05:000%1.6m/s
06:000%1.4m/s
07:000%1.4m/s
08:000%1.5m/s
09:000%1.6m/s
10:000%1.4m/s
11:000%1.4m/s
12:000%1.5m/s
13:000%1.6m/s
14:000%1.6m/s
15:000%1.7m/s
16:000%1.9m/s
17:000%2.2m/s
18:000%2.3m/s
19:000%2.5m/s
20:000%2.7m/s
21:000%2.8m/s
22:000%3m/s
23:000%2.4m/s
Wed, May 27
24:000%1.8m/s
01:000%1.2m/s
02:000%1.4m/s
03:000%1.5m/s
04:000%1.6m/s
05:000%1.8m/s
06:000%2.1m/s
07:000%2.3m/s
08:000%2.5m/s
09:000%2.7m/s
10:000%2.9m/s
11:000%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 04:48 Sunset 21:56
14:00
11°C 10°C 11°C - 100% 0.04kPa
15:00
11°C 10°C 11°C - 100% 0.05kPa
16:00
11°C 10°C 11°C - 100% 0.06kPa
17:00
11°C 10°C 12°C - 100% 0.07kPa
18:00
11°C 10°C 11°C - 99% 0.06kPa
19:00
11°C 10°C 11°C - 100% 0.05kPa
20:00
11°C 10°C 11°C - 100% 0.04kPa
21:00
11°C 10°C 11°C - 100% 0.03kPa
22:00
11°C 10°C 11°C - 100% 0.03kPa
23:00
11°C 10°C 11°C - 100% 0.04kPa
Mon, May 25 Sunrise 04:48 Sunset 21:56
24:00
11°C 10°C 11°C - 100% 0.05kPa
01:00
11°C 10°C 11°C - 100% 0.05kPa
02:00
11°C 10°C 11°C - 100% 0.05kPa
03:00
10°C 10°C 11°C - 100% 0.05kPa
04:00
10°C 10°C 11°C - 100% 0.05kPa
05:00
10°C 10°C 11°C - 100% 0.05kPa
06:00
10°C 10°C 11°C - 100% 0.04kPa
07:00
10°C 10°C 11°C - 100% 0.04kPa
08:00
10°C 10°C 11°C - 100% 0.03kPa
09:00
10°C 10°C 11°C - 100% 0.03kPa
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% 0.04kPa
13:00
11°C 10°C 11°C - 100% 0.05kPa
14:00
11°C 10°C 11°C - 100% 0.07kPa
15:00
11°C 10°C 12°C - 100% 0.09kPa
16:00
10°C 10°C 12°C - 63% 0.11kPa
17:00
10°C 11°C 13°C - 28% 0.27kPa
18:00
9.2°C 11°C 13°C - 47% 0.35kPa
19:00
8.8°C 11°C 13°C - 14% 0.34kPa
20:00
8.8°C 11°C 12°C - 52% 0.26kPa
21:00
8.9°C 11°C 11°C - 47% 0.15kPa
22:00
8.6°C 11°C 9.2°C - 41% 0.05kPa
23:00
8.2°C 11°C 8.6°C - 57% 0.04kPa
Tue, May 26 Sunrise 04:46 Sunset 21:58
24:00
7.9°C 10°C 8.8°C - 100% 0.07kPa
01:00
7.9°C 10°C 9.5°C - 100% 0.12kPa
02:00
7.9°C 10°C 9.6°C - 100% 0.13kPa
03:00
7.8°C 10°C 9.5°C - 100% 0.13kPa
04:00
7.8°C 10°C 9.5°C - 100% 0.13kPa
05:00
7.9°C 10°C 9.4°C - 99% 0.12kPa
06:00
8°C 10°C 9.6°C - 62% 0.12kPa
07:00
8.1°C 10°C 10°C - 58% 0.17kPa
08:00
7.5°C 10°C 11°C - 68% 0.3kPa
09:00
7.1°C 10°C 12°C - 92% 0.38kPa
10:00
6.8°C 10°C 13°C - 96% 0.47kPa
11:00
6.4°C 11°C 13°C - 94% 0.53kPa
12:00
5.9°C 11°C 13°C - 87% 0.58kPa
13:00
5.3°C 11°C 14°C - 21% 0.71kPa
14:00
5.1°C 11°C 15°C - 32% 0.88kPa
15:00
4.7°C 12°C 15°C - 9% 0.9kPa
16:00
4.7°C 12°C 15°C - 52% 0.87kPa
17:00
4.8°C 12°C 15°C - 80% 0.79kPa
18:00
5°C 13°C 14°C - 64% 0.71kPa
19:00
5.1°C 13°C 13°C - 76% 0.61kPa
20:00
5.8°C 3250°C 12°C - 62% 0.46kPa
21:00
6.2°C 6488°C 11°C - 48% 0.33kPa
22:00
6.5°C 9726°C 9.6°C - 34% 0.22kPa
23:00
6.6°C 9726°C 9.7°C - 55% 0.23kPa
Wed, May 27 Sunrise 04:45 Sunset 21:59
24:00
6.7°C 9726°C 9.9°C - 75% 0.23kPa
01:00
6.9°C 9726°C 10°C - 96% 0.24kPa
02:00
6.9°C 9726°C 10°C - 66% 0.27kPa
03:00
6.9°C 9726°C 11°C - 36% 0.31kPa
04:00
7°C 9726°C 11°C - 5% 0.34kPa
05:00
7°C 9726°C 11°C - 5% 0.33kPa
06:00
7.1°C 9726°C 11°C - 5% 0.32kPa
07:00
7.1°C 9726°C 11°C - 5% 0.31kPa
08:00
7.3°C 9726°C 11°C - 10% 0.28kPa
09:00
7.4°C 9726°C 11°C - 14% 0.25kPa
10:00
7.6°C 9726°C 10°C - 19% 0.22kPa
11:00
7.9°C 9726°C 11°C - 19% 0.23kPa
12:00
8.1°C 9726°C 11°C - 19% 0.25kPa
13:00
8.4°C 9726°C 12°C - 19% 0.26kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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