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Rule Morning Frost

Cairngorms - Morning Frost - Scotland

Aviemore, 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 100% failing
Time Window 88% failing

Currently

Real-time conditions
Soil Temperature10.9°C
Dew Point1.0°C (low dew point)
Wind Speed4.1m/s (calm conditions)
Cloud Cover97%

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 82 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
Mon, Jun 8
05:000%3.6m/s
06:000%3.7m/s
07:000%2.7m/s
08:000%3.1m/s
09:000%4.1m/s
10:000%4.8m/s
11:000%5.1m/s
12:000%4.9m/s
13:000%4.9m/s
14:000%5.2m/s
15:000%4.6m/s
16:000%4.1m/s
17:000%4m/s
18:000%3.9m/s
19:000%4.1m/s
20:000%3.2m/s
21:000%2.7m/s
22:000%2.3m/s
23:000%2.2m/s
Tue, Jun 9
24:000%2.2m/s
01:000%2.2m/s
02:000%2.1m/s
03:000%2m/s
04:000%1.9m/s
05:000%1.7m/s
06:000%2m/s
07:000%2m/s
08:000%2.7m/s
09:000%2.6m/s
10:000%2.1m/s
11:000%2.3m/s
12:000%2.9m/s
13:000%2.6m/s
14:000%2.4m/s
15:000%2.7m/s
16:000%3.4m/s
17:000%3.7m/s
18:000%2.7m/s
19:000%2.3m/s
20:000%2.8m/s
21:000%2.4m/s
22:000%2m/s
23:000%2.2m/s
Wed, Jun 10
24:000%2.2m/s
01:000%2.5m/s
02:001.2%2.6m/s
03:001.2%2.6m/s
04:001.3%2.7m/s
05:001.2%2.7m/s
06:001.7%2.6m/s
07:001.9%2.6m/s
08:003.3%2.7m/s
09:004.5%2.9m/s
10:004.3%2.9m/s
11:002.9%3.1m/s
12:002.7%3.3m/s
13:000%3.6m/s
14:000%3.4m/s
15:000%3.7m/s
16:000%4.3m/s
17:000%4.1m/s
18:000%3.8m/s
19:000%3.5m/s
20:000%2.2m/s
21:000%2.2m/s
22:000%2.2m/s
23:000%2.4m/s
Thu, Jun 11
24:000%2.6m/s
01:000%2.6m/s
02:002.6%2.8m/s
03:003%3m/s
04:003%3.2m/s
05:003%3.1m/s
06:001.7%2.9m/s
07:001.2%2.7m/s
08:001.2%2.7m/s
09:001.2%2.7m/s
10:001.2%2.7m/s
11:001.2%2.6m/s
12:001.2%2.6m/s
13:001.2%2.5m/s
14:001.2%2.4m/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 8 Sunrise 04:22 Sunset 22:06
16:00
1°C 11°C 14°C - 97% 0.89kPa
17:00
1.4°C 11°C 12°C - 82% 0.74kPa
18:00
1.8°C 11°C 12°C - 55% 0.71kPa
19:00
1.7°C 11°C 12°C - 72% 0.69kPa
20:00
2.7°C 11°C 11°C - 90% 0.56kPa
21:00
3°C 11°C 9.1°C - 6% 0.4kPa
22:00
3°C 11°C 6.7°C - 77% 0.22kPa
23:00
3.2°C 10°C 6.1°C - 80% 0.17kPa
Tue, Jun 9 Sunrise 04:22 Sunset 22:06
24:00
3.3°C 10°C 5.8°C - 65% 0.15kPa
01:00
3.4°C 9.8°C 5.1°C - 56% 0.1kPa
02:00
3.5°C 9.4°C 4.5°C - 98% 0.06kPa
03:00
3.6°C 9.2°C 4.9°C - 96% 0.08kPa
04:00
3.6°C 9°C 6.1°C - 100% 0.15kPa
05:00
3.5°C 8.9°C 6.7°C - 100% 0.2kPa
06:00
4°C 8.8°C 6.9°C - 100% 0.18kPa
07:00
4.5°C 8.7°C 6.9°C - 100% 0.15kPa
08:00
3.6°C 8.6°C 7.8°C - 100% 0.26kPa
09:00
3.2°C 8.7°C 8°C - 93% 0.31kPa
10:00
1.9°C 8.7°C 9.2°C - 38% 0.47kPa
11:00
1.7°C 8.9°C 11°C - 84% 0.63kPa
12:00
2.6°C 9°C 11°C - 100% 0.56kPa
13:00
2.9°C 9.1°C 10°C - 99% 0.51kPa
14:00
2.9°C 9.2°C 11°C - 97% 0.53kPa
15:00
3.8°C 9.4°C 11°C - 94% 0.52kPa
16:00
4.9°C 9.6°C 11°C - 100% 0.44kPa
17:00
5.5°C 9.6°C 9.7°C - 100% 0.3kPa
18:00
5.6°C 9.6°C 9.2°C - 100% 0.26kPa
19:00
5.7°C 9.5°C 8.9°C - 100% 0.22kPa
20:00
5.4°C 9.5°C 8.2°C - 58% 0.19kPa
21:00
4.9°C 9.3°C 7°C - 22% 0.14kPa
22:00
3.7°C 9.1°C 5.1°C - 5% 0.09kPa
23:00
3.1°C 8.8°C 4.3°C - 82% 0.07kPa
Wed, Jun 10 Sunrise 04:21 Sunset 22:07
24:00
2.9°C 8.5°C 4°C - 100% 0.06kPa
01:00
2.9°C 8.2°C 3.8°C - 87% 0.05kPa
02:00
2.6°C 8°C 3.5°C - 100% 0.05kPa
03:00
2.7°C 7.6°C 3.6°C - 81% 0.05kPa
04:00
2.2°C 7.4°C 3°C - 66% 0.04kPa
05:00
2.1°C 7.1°C 2.9°C - 94% 0.04kPa
06:00
3°C 7°C 4°C - 73% 0.06kPa
07:00
4°C 6.9°C 6°C - 86% 0.12kPa
08:00
4.1°C 6.9°C 7.5°C - 71% 0.21kPa
09:00
3.4°C 7.1°C 9°C - 9% 0.36kPa
10:00
2.2°C 7.4°C 11°C - 18% 0.57kPa
11:00
2°C 7.7°C 12°C - 91% 0.66kPa
12:00
2°C 8°C 12°C - 100% 0.7kPa
13:00
2.3°C 8.3°C 12°C - 100% 0.71kPa
14:00
2.3°C 8.6°C 12°C - 97% 0.68kPa
15:00
2.8°C 8.8°C 12°C - 100% 0.68kPa
16:00
4.3°C 9.1°C 11°C - 81% 0.52kPa
17:00
4.7°C 9.2°C 11°C - 57% 0.45kPa
18:00
4.6°C 9.3°C 11°C - 81% 0.45kPa
19:00
4.9°C 9.4°C 10°C - 90% 0.37kPa
20:00
4.9°C 9.3°C 9.7°C - 67% 0.33kPa
21:00
4.3°C 9.3°C 8.6°C - 60% 0.29kPa
22:00
3.4°C 9.2°C 7.1°C - 15% 0.22kPa
23:00
2.6°C 9°C 5.2°C - 5% 0.15kPa
Thu, Jun 11 Sunrise 04:21 Sunset 22:08
24:00
2.2°C 8.7°C 4.5°C - 49% 0.13kPa
01:00
2.1°C 8.4°C 4.4°C - 69% 0.12kPa
02:00
2.5°C 7.6°C 5.6°C - 79% 0.18kPa
03:00
3°C 6.8°C 6.9°C - 90% 0.24kPa
04:00
3.3°C 6.1°C 8.2°C - 100% 0.31kPa
05:00
4.3°C 6.2°C 7.8°C - 100% 0.23kPa
06:00
5.2°C 6.3°C 7.4°C - 100% 0.14kPa
07:00
6°C 6.5°C 7°C - 100% 0.07kPa
08:00
6.2°C 6.5°C 7°C - 100% 0.05kPa
09:00
6.5°C 6.5°C 7.1°C - 100% 0.04kPa
10:00
6.8°C 6.6°C 7.1°C - 100% 0.02kPa
11:00
6.8°C 6.6°C 7.2°C - 100% 0.02kPa
12:00
6.9°C 6.7°C 7.2°C - 100% 0.02kPa
13:00
6.9°C 6.7°C 7.2°C - 100% 0.02kPa
14:00
6.9°C 6.8°C 7.1°C - 100% 0.02kPa
15:00
6.8°C 6.8°C 7°C - 100% 0.02kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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