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Rule Morning Frost

Rannoch Moor - Morning Frost - Scotland

Kinloch Rannoch, 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 83% failing
Wind Speed 83% failing

Currently

Real-time conditions
Soil Temperature10.3°C
Dew Point9.5°C (moderate dew point)
Wind Speed2.6m/s (calm conditions)
Cloud Cover73%

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 80 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
05:000%2.3m/s
06:000%2.3m/s
07:000%2.2m/s
08:000%2.6m/s
09:000%2.6m/s
10:000%2.7m/s
11:000%3.2m/s
12:000%3m/s
13:000%2.8m/s
14:000%2.6m/s
15:000%3.1m/s
16:000%3.8m/s
17:000%3.3m/s
18:000%2.6m/s
19:000%2.3m/s
20:000%2m/s
21:000%1.9m/s
22:000%2.1m/s
23:000%2.1m/s
Mon, May 25
24:000%2m/s
01:000%2.1m/s
02:000%2.3m/s
03:000%2.4m/s
04:000%2.4m/s
05:000%2.4m/s
06:000%2.2m/s
07:000%2.5m/s
08:000%3.5m/s
09:000%4.6m/s
10:000%4.9m/s
11:000%6.2m/s
12:000%6.1m/s
13:000%6.1m/s
14:000%5.8m/s
15:000%5.6m/s
16:000%4.6m/s
17:000%3.5m/s
18:000%2.5m/s
19:000%2.1m/s
20:000%2.3m/s
21:000%2.1m/s
22:000%1.9m/s
23:000%1.9m/s
Tue, May 26
24:000%1.7m/s
01:000%1.9m/s
02:000%1.8m/s
03:000%1.8m/s
04:000%1.6m/s
05:000%1.5m/s
06:000%1.3m/s
07:000%1.2m/s
08:000%1.4m/s
09:000%1.6m/s
10:000%1.7m/s
11:000%1.8m/s
12:000%1.7m/s
13:000%1.8m/s
14:000%1.9m/s
15:000%1.9m/s
16:000%1.8m/s
17:000%1.6m/s
18:000%0.89m/s
19:000%1.4m/s
20:000%1.3m/s
21:000%1.2m/s
22:000%1.1m/s
23:000%1.2m/s
Wed, May 27
24:000%1.2m/s
01:000%1.3m/s
02:000%1.6m/s
03:000%1.8m/s
04:000%2.1m/s
05:000%2.3m/s
06:000%2.6m/s
07:000%2.9m/s
08:000%2.9m/s
09:000%2.9m/s
10:000%3m/s
11:000%2.6m/s
12:000%2.2m/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 04:44 Sunset 21:43
14:00
9.5°C 10°C 12°C - 73% 0.2kPa
15:00
9.7°C 11°C 14°C - 61% 0.37kPa
16:00
9.7°C 11°C 15°C - 86% 0.5kPa
17:00
9.6°C 11°C 15°C - 100% 0.52kPa
18:00
9.7°C 11°C 15°C - 91% 0.47kPa
19:00
9.8°C 12°C 15°C - 90% 0.48kPa
20:00
11°C 12°C 14°C - 62% 0.35kPa
21:00
10°C 12°C 13°C - 74% 0.23kPa
22:00
10°C 12°C 12°C - 98% 0.14kPa
23:00
10°C 11°C 12°C - 82% 0.14kPa
Mon, May 25 Sunrise 04:44 Sunset 21:43
24:00
10°C 11°C 11°C - 15% 0.1kPa
01:00
9.1°C 11°C 9.8°C - 5% 0.06kPa
02:00
8.7°C 11°C 9.3°C - 5% 0.05kPa
03:00
8.4°C 11°C 8.9°C - 27% 0.04kPa
04:00
8.1°C 11°C 8.5°C - 5% 0.03kPa
05:00
7.7°C 10°C 8.2°C - 98% 0.03kPa
06:00
8.6°C 10°C 9.1°C - 43% 0.04kPa
07:00
9.5°C 10°C 11°C - 5% 0.12kPa
08:00
9.3°C 10°C 13°C - 10% 0.33kPa
09:00
9.3°C 11°C 14°C - 84% 0.46kPa
10:00
9.5°C 11°C 15°C - 24% 0.47kPa
11:00
9.8°C 11°C 16°C - 35% 0.56kPa
12:00
10°C 11°C 16°C - 45% 0.61kPa
13:00
10°C 12°C 16°C - 57% 0.65kPa
14:00
10°C 12°C 17°C - 46% 0.66kPa
15:00
10°C 13°C 17°C - 62% 0.66kPa
16:00
10°C 13°C 16°C - 88% 0.54kPa
17:00
10°C 13°C 14°C - 100% 0.37kPa
18:00
11°C 13°C 13°C - 100% 0.24kPa
19:00
11°C 13°C 13°C - 100% 0.19kPa
20:00
11°C 13°C 13°C - 57% 0.16kPa
21:00
11°C 13°C 12°C - 12% 0.11kPa
22:00
9.5°C 12°C 10°C - 50% 0.05kPa
23:00
9.6°C 12°C 10°C - 75% 0.04kPa
Tue, May 26 Sunrise 04:43 Sunset 21:45
24:00
9.4°C 12°C 9.9°C - 65% 0.04kPa
01:00
8.8°C 12°C 9.2°C - 19% 0.03kPa
02:00
8.2°C 11°C 8.6°C - 6% 0.03kPa
03:00
7.7°C 11°C 8.2°C - 5% 0.03kPa
04:00
7.4°C 11°C 8°C - 77% 0.04kPa
05:00
7.9°C 11°C 8.9°C - 38% 0.08kPa
06:00
7.8°C 11°C 9.1°C - 32% 0.1kPa
07:00
7.7°C 11°C 11°C - 28% 0.22kPa
08:00
7.4°C 11°C 12°C - 12% 0.39kPa
09:00
7°C 11°C 14°C - 15% 0.56kPa
10:00
6.7°C 11°C 15°C - 43% 0.73kPa
11:00
6.6°C 12°C 16°C - 100% 0.84kPa
12:00
6.4°C 12°C 15°C - 77% 0.78kPa
13:00
6.9°C 12°C 17°C - 14% 0.94kPa
14:00
7.6°C 13°C 18°C - 26% 1kPa
15:00
8°C 13°C 19°C - 5% 1.1kPa
16:00
8.4°C 14°C 19°C - 26% 1.1kPa
17:00
8.5°C 14°C 19°C - 40% 1kPa
18:00
8.7°C 14°C 18°C - 62% 0.99kPa
19:00
10°C 14°C 17°C - 69% 0.72kPa
20:00
8.5°C 13°C 13°C - 78% 0.41kPa
21:00
6.6°C 13°C 9.3°C - 87% 0.2kPa
22:00
4.4°C 12°C 5.5°C - 96% 0.06kPa
23:00
4.6°C 11°C 6.3°C - 97% 0.11kPa
Wed, May 27 Sunrise 04:41 Sunset 21:46
24:00
4.7°C 11°C 7.2°C - 98% 0.16kPa
01:00
4.7°C 11°C 8.1°C - 100% 0.22kPa
02:00
5.5°C 11°C 9.8°C - 68% 0.3kPa
03:00
6.2°C 11°C 11°C - 37% 0.4kPa
04:00
6.8°C 11°C 13°C - 6% 0.52kPa
05:00
7.6°C 11°C 14°C - 21% 0.57kPa
06:00
8.4°C 11°C 15°C - 37% 0.63kPa
07:00
9.1°C 12°C 16°C - 53% 0.7kPa
08:00
9.4°C 12°C 16°C - 48% 0.69kPa
09:00
9.6°C 12°C 17°C - 42% 0.69kPa
10:00
9.9°C 12°C 17°C - 37% 0.68kPa
11:00
9.9°C 13°C 16°C - 45% 0.61kPa
12:00
9.8°C 13°C 15°C - 52% 0.53kPa
13:00
9.8°C 13°C 15°C - 60% 0.47kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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