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Rule Morning Frost

Isle of Lewis - Morning Frost - Scotland

Stornoway, 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 86% failing

Currently

Real-time conditions
Soil Temperature7.3°C
Dew Point6.4°C (moderate dew point)
Wind Speed6.3m/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
Wed, Apr 8
02:000%3.7m/s
03:000%2.8m/s
04:000%2.5m/s
05:003.1%2.5m/s
06:002.5%3m/s
07:001.4%3.1m/s
08:002.3%4.4m/s
09:002.8%5.2m/s
10:002.6%6.7m/s
11:000%7.9m/s
12:000%8.4m/s
13:000%9m/s
14:000%9.4m/s
15:000%9.5m/s
16:000%9.9m/s
17:000%10m/s
18:000%9.7m/s
19:000%9.2m/s
20:001.3%9.1m/s
21:001.3%8.6m/s
22:001%7.8m/s
23:001%7.8m/s
Thu, Apr 9
24:001%7.4m/s
01:001%6.3m/s
02:001%6.2m/s
03:001%6.3m/s
04:001.5%5.2m/s
05:002.3%5.1m/s
06:001.5%4.8m/s
07:002.1%7.2m/s
08:001%7.4m/s
09:001.3%6.5m/s
10:002.6%7.1m/s
11:003.4%8.2m/s
12:004.3%8.2m/s
13:002.9%8.5m/s
14:002.8%8m/s
15:000%7.3m/s
16:000%5.1m/s
17:000%6.6m/s
18:000%7.5m/s
19:000%7.4m/s
20:002.6%7.7m/s
21:002.6%7.2m/s
22:003%7.2m/s
23:003.4%7.4m/s
Fri, Apr 10
24:004.1%6.7m/s
01:0036%5.5m/s
02:0029%5.6m/s
03:0044%5.1m/s
04:0033%4.4m/s
05:0036%4.6m/s
06:0038%4.5m/s
07:0043%3.4m/s
08:0048%3.6m/s
09:0042%4.7m/s
10:0048%5.3m/s
11:0032%5.2m/s
12:0031%5.4m/s
13:0029%7m/s
14:002.8%7m/s
15:002.8%7.2m/s
16:002.8%7.3m/s
17:003%7m/s
18:002.6%6.8m/s
19:003%7.8m/s
20:003%9.5m/s
21:003%10m/s
22:003%10m/s
23:002.6%10m/s
Sat, Apr 11
24:0027%11m/s
01:0027%10m/s
02:0022%11m/s
03:0011%11m/s
04:0011%12m/s
05:0011%11m/s
06:007%8.7m/s
07:0023%9.9m/s
08:000%9.1m/s
09:000%8.3m/s
10:000%7.5m/s
11:000%7.9m/s
12:000%8.3m/s
13:000%8.7m/s
14:000%8.7m/s
15:000%8.7m/s
16:000%8.7m/s
17:000%9m/s
18:000%9.3m/s
19:000%9.5m/s
20:000%9.3m/s
21:000%9.1m/s
22:000%8.8m/s
23:000%9m/s
Sun, Apr 12
24:000%9.2m/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
Thu, Apr 9 Sunrise 06:31 Sunset 20:24
03:00
6.4°C 7.3°C 7.9°C - 100% 0.1kPa
04:00
5.1°C 7.3°C 7.7°C - 100% 0.18kPa
05:00
4°C 7.2°C 7.1°C - 85% 0.2kPa
06:00
3.1°C 6.9°C 6°C - 97% 0.17kPa
07:00
2.5°C 6.6°C 5.8°C - 100% 0.19kPa
08:00
3.8°C 6.5°C 5.5°C - 100% 0.1kPa
09:00
1.8°C 6.3°C 4.6°C - 100% 0.15kPa
10:00
1.8°C 6.4°C 6.2°C - 98% 0.26kPa
11:00
0.4°C 6.6°C 7.3°C - 51% 0.39kPa
12:00
-1.3°C 7.1°C 7.3°C - 8% 0.47kPa
13:00
-1.3°C 7.5°C 7.8°C - 74% 0.5kPa
14:00
-0.8°C 7.9°C 8.1°C - 81% 0.5kPa
15:00
-0.3°C 8.3°C 8.1°C - 74% 0.48kPa
16:00
0.8°C 8.6°C 7.2°C - 57% 0.36kPa
17:00
1.1°C 8.7°C 6.7°C - 43% 0.32kPa
18:00
1.8°C 8.6°C 6.7°C - 59% 0.28kPa
19:00
2°C 8.4°C 5.9°C - 100% 0.23kPa
20:00
0.7°C 7.9°C 5.7°C - 100% 0.27kPa
21:00
-0.1°C 7.5°C 5.2°C - 100% 0.28kPa
22:00
-1.1°C 7.2°C 5°C - 100% 0.31kPa
23:00
-2.1°C 6.8°C 4.8°C - 50% 0.33kPa
Fri, Apr 10 Sunrise 06:31 Sunset 20:24
24:00
-2.3°C 6.3°C 3.8°C - 10% 0.29kPa
01:00
-2.5°C 5.8°C 3.4°C - 39% 0.27kPa
02:00
-2.5°C 5.4°C 3.2°C - 92% 0.26kPa
03:00
-2.8°C 5°C 3.1°C - 8% 0.27kPa
04:00
-2.7°C 4.6°C 2.6°C - 50% 0.24kPa
05:00
-2.8°C 4.2°C 2.5°C - 30% 0.24kPa
06:00
-2.7°C 3.9°C 2.4°C - 32% 0.22kPa
07:00
-2.4°C 3.6°C 1.8°C - 5% 0.18kPa
08:00
-1.8°C 3.4°C 2.8°C - 5% 0.21kPa
09:00
-1.8°C 3.6°C 4.6°C - 27% 0.32kPa
10:00
-2°C 4.1°C 5.9°C - 5% 0.4kPa
11:00
-2.1°C 4.7°C 6.6°C - 61% 0.45kPa
12:00
-2.2°C 5.4°C 7.3°C - 96% 0.5kPa
13:00
-1.6°C 6°C 7.2°C - 100% 0.47kPa
14:00
-1.5°C 6.5°C 7.1°C - 100% 0.47kPa
15:00
-1°C 6.9°C 7.1°C - 100% 0.44kPa
16:00
-0.7°C 7.1°C 6.8°C - 100% 0.41kPa
17:00
-0.3°C 7.1°C 6.7°C - 100% 0.38kPa
18:00
0°C 7°C 6°C - 100% 0.32kPa
19:00
-0.4°C 6.9°C 6.8°C - 100% 0.39kPa
20:00
-0.2°C 6.8°C 6.4°C - 97% 0.36kPa
21:00
-0.9°C 6.6°C 6.5°C - 99% 0.4kPa
22:00
-0.6°C 6.4°C 5.8°C - 100% 0.34kPa
23:00
0.1°C 6.2°C 5.6°C - 100% 0.29kPa
Sat, Apr 11 Sunrise 06:28 Sunset 20:26
24:00
0.9°C 6°C 5.2°C - 100% 0.23kPa
01:00
0.8°C 5.8°C 5.5°C - 100% 0.25kPa
02:00
1.3°C 5.6°C 4.9°C - 100% 0.19kPa
03:00
2.1°C 5.4°C 4.1°C - 100% 0.1kPa
04:00
2.6°C 5.3°C 4°C - 100% 0.07kPa
05:00
3°C 5.1°C 4.2°C - 100% 0.07kPa
06:00
3°C 5°C 3.5°C - 100% 0.03kPa
07:00
0.8°C 4.9°C 4.4°C - 77% 0.19kPa
08:00
0°C 3245°C 5°C - 80% 0.26kPa
09:00
-1°C 6486°C 5.6°C - 83% 0.34kPa
10:00
-2.2°C 9726°C 6.2°C - 86% 0.43kPa
11:00
-1.6°C 9726°C 6.2°C - 77% 0.4kPa
12:00
-1°C 9726°C 6.3°C - 68% 0.38kPa
13:00
-0.5°C 9726°C 6.3°C - 59% 0.36kPa
14:00
-0.1°C 9726°C 6.1°C - 73% 0.34kPa
15:00
0.2°C 9726°C 6°C - 86% 0.31kPa
16:00
0.5°C 9726°C 5.8°C - 100% 0.29kPa
17:00
1.2°C 9726°C 5.5°C - 100% 0.24kPa
18:00
1.9°C 9726°C 5.2°C - 100% 0.18kPa
19:00
2.5°C 9726°C 4.9°C - 100% 0.13kPa
20:00
2.4°C 9726°C 5.4°C - 100% 0.18kPa
21:00
2.2°C 9726°C 6°C - 100% 0.22kPa
22:00
1.9°C 9726°C 6.5°C - 100% 0.27kPa
23:00
2.3°C 9726°C 6.2°C - 100% 0.23kPa
Sun, Apr 12 Sunrise 06:25 Sunset 20:28
24:00
2.6°C 9726°C 6°C - 100% 0.2kPa
01:00
2.9°C 9726°C 5.7°C - 100% 0.16kPa
02:00
3.1°C 9726°C 5.7°C - 100% 0.15kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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