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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 99% failing
Time Window 88% failing

Currently

Real-time conditions
Soil Temperature9725.9°C
Dew Point6.3°C (moderate dew point)
Wind Speed2.5m/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
Wed, Apr 8
02:000%6.1m/s
03:000%6.1m/s
04:000%6.8m/s
05:000%6m/s
06:000%4.6m/s
07:000%4m/s
08:000%5.1m/s
09:000%4.1m/s
10:000%2.1m/s
11:000%1.7m/s
12:000%2.2m/s
13:000%0.67m/s
14:000%1.6m/s
15:000%3m/s
16:000%4.4m/s
17:000%5.5m/s
18:000%5.7m/s
19:000%4.9m/s
20:000%5.3m/s
21:000%4.7m/s
22:000%3.3m/s
23:000%1.3m/s
Thu, Apr 9
24:000%0.91m/s
01:000%1.2m/s
02:000%2.4m/s
03:000%2.5m/s
04:000%2.4m/s
05:000%2.6m/s
06:000%4.5m/s
07:000%3.5m/s
08:000%4.3m/s
09:000%9.5m/s
10:000%10m/s
11:000%12m/s
12:000%11m/s
13:000%12m/s
14:000%11m/s
15:000%11m/s
16:000%11m/s
17:000%9.2m/s
18:000%7.8m/s
19:000%8.7m/s
20:000%9.1m/s
21:000%8.7m/s
22:000%9.1m/s
23:000%8.2m/s
Fri, Apr 10
24:000%11m/s
01:000%13m/s
02:000%9.5m/s
03:000%10m/s
04:000%10m/s
05:000%10m/s
06:000%9.9m/s
07:000%9.6m/s
08:000%9.2m/s
09:000%8.6m/s
10:000%8.1m/s
11:000%8.1m/s
12:000%7.6m/s
13:000%5.9m/s
14:000%3.9m/s
15:000%2.6m/s
16:000%6.5m/s
17:000%8.4m/s
18:000%11m/s
19:000%12m/s
20:000%13m/s
21:000%14m/s
22:000%14m/s
23:000%14m/s
Sat, Apr 11
24:000%15m/s
01:000%16m/s
02:000%17m/s
03:000%18m/s
04:000%19m/s
05:000%20m/s
06:000%21m/s
07:000%21m/s
08:000%17m/s
09:000%13m/s
10:000%9.8m/s
11:000%9m/s
12:000%8.3m/s
13:000%7.6m/s
14:000%9.1m/s
15:000%11m/s
16:000%12m/s
17:000%13m/s
18:000%14m/s
19:000%15m/s
20:000%15m/s
21:000%15m/s
22:000%16m/s
23:000%15m/s
Sun, Apr 12
24:000%15m/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
Thu, Apr 9 Sunrise 06:15 Sunset 20:12
03:00
6.3°C 9726°C 7.7°C - 100% 0.09kPa
04:00
6°C 9726°C 7.8°C - 100% 0.12kPa
05:00
5.9°C 9726°C 7.8°C - 100% 0.13kPa
06:00
6.1°C 9726°C 7.6°C - 100% 0.1kPa
07:00
6.4°C 9726°C 7.2°C - 100% 0.05kPa
08:00
6.6°C 9726°C 7.3°C - 100% 0.05kPa
09:00
6.3°C 9726°C 7.2°C - 100% 0.06kPa
10:00
4.9°C 9726°C 6.7°C - 100% 0.12kPa
11:00
4.6°C 9726°C 6.6°C - 100% 0.13kPa
12:00
4.3°C 9726°C 6.5°C - 100% 0.14kPa
13:00
3.1°C 9726°C 6.4°C - 100% 0.19kPa
14:00
2.9°C 9726°C 6.5°C - 100% 0.22kPa
15:00
2.2°C 9726°C 6.7°C - 87% 0.27kPa
16:00
1.6°C 9726°C 7°C - 0% 0.31kPa
17:00
1.7°C 9726°C 6.9°C - 0% 0.3kPa
18:00
1.6°C 9726°C 7°C - 0% 0.31kPa
19:00
2°C 9726°C 6.9°C - 0% 0.29kPa
20:00
2.7°C 9726°C 6.6°C - 14% 0.23kPa
21:00
2.9°C 9726°C 6.4°C - 88% 0.21kPa
22:00
3°C 9726°C 6.4°C - 49% 0.2kPa
23:00
3.3°C 9726°C 6.3°C - 100% 0.18kPa
Fri, Apr 10 Sunrise 06:15 Sunset 20:12
24:00
3.3°C 9726°C 5.9°C - 100% 0.15kPa
01:00
3.2°C 9726°C 5.2°C - 100% 0.11kPa
02:00
1.3°C 9726°C 5.8°C - 100% 0.25kPa
03:00
1°C 9726°C 6.4°C - 100% 0.3kPa
04:00
0.2°C 9726°C 6.2°C - 100% 0.33kPa
05:00
-0.3°C 9726°C 6.1°C - 95% 0.35kPa
06:00
-0.8°C 9726°C 6.1°C - 5% 0.36kPa
07:00
-0.8°C 9726°C 6°C - 5% 0.36kPa
08:00
-0.7°C 9726°C 5.7°C - 78% 0.34kPa
09:00
-0.7°C 9726°C 5.8°C - 12% 0.34kPa
10:00
-0.7°C 9726°C 5.9°C - 5% 0.34kPa
11:00
-0.8°C 9726°C 5.8°C - 5% 0.35kPa
12:00
-0.8°C 9726°C 5.9°C - 5% 0.36kPa
13:00
-1.4°C 9726°C 6.1°C - 5% 0.39kPa
14:00
-1.9°C 9726°C 6.1°C - 5% 0.41kPa
15:00
-2.1°C 9726°C 6.2°C - 52% 0.42kPa
16:00
-0.1°C 9726°C 6.1°C - 94% 0.34kPa
17:00
0.2°C 9726°C 5.9°C - 45% 0.31kPa
18:00
0°C 9726°C 6°C - 100% 0.32kPa
19:00
1.3°C 9726°C 6°C - 32% 0.26kPa
20:00
1.3°C 9726°C 6.1°C - 91% 0.27kPa
21:00
1.5°C 9726°C 5.9°C - 60% 0.25kPa
22:00
2°C 9726°C 5.9°C - 44% 0.22kPa
23:00
2°C 9726°C 5.8°C - 56% 0.21kPa
Sat, Apr 11 Sunrise 06:13 Sunset 20:14
24:00
2.3°C 9726°C 5.8°C - 5% 0.2kPa
01:00
2.4°C 9726°C 5.8°C - 36% 0.19kPa
02:00
2.3°C 9726°C 5.8°C - 100% 0.2kPa
03:00
2.4°C 9726°C 5.7°C - 100% 0.19kPa
04:00
3°C 9726°C 5.8°C - 100% 0.16kPa
05:00
4.4°C 9726°C 5°C - 100% 0.03kPa
06:00
4.3°C 9726°C 5.3°C - 100% 0.06kPa
07:00
4.6°C 9726°C 5.1°C - 100% 0.03kPa
08:00
3.7°C 9726°C 5.2°C - 100% 0.08kPa
09:00
2.9°C 9726°C 5.3°C - 100% 0.14kPa
10:00
1.9°C 9726°C 5.4°C - 100% 0.19kPa
11:00
1.9°C 9726°C 5.5°C - 67% 0.2kPa
12:00
1.9°C 9726°C 5.6°C - 33% 0.21kPa
13:00
1.9°C 9726°C 5.7°C - 0% 0.21kPa
14:00
2.1°C 9726°C 6°C - 0% 0.22kPa
15:00
2.3°C 9726°C 6.3°C - 0% 0.24kPa
16:00
2.4°C 9726°C 6.6°C - 0% 0.25kPa
17:00
2.6°C 9726°C 6.5°C - 16% 0.23kPa
18:00
2.9°C 9726°C 6.4°C - 32% 0.21kPa
19:00
3.1°C 9726°C 6.3°C - 49% 0.19kPa
20:00
3.3°C 9726°C 6.2°C - 59% 0.18kPa
21:00
3.5°C 9726°C 6.2°C - 69% 0.16kPa
22:00
3.8°C 9726°C 6.1°C - 79% 0.14kPa
23:00
3.9°C 9726°C 6.2°C - 69% 0.14kPa
Sun, Apr 12 Sunrise 06:10 Sunset 20:17
24:00
4.1°C 9726°C 6.4°C - 60% 0.14kPa
01:00
4.3°C 9726°C 6.5°C - 50% 0.14kPa
02:00
4.4°C 9726°C 6.6°C - 38% 0.14kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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