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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 100% failing
Time Window 86% failing

Currently

Real-time conditions
Soil Temperature6.3°C
Dew Point2.9°C (low dew point)
Wind Speed4.4m/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
08:001.6%2.8m/s
09:001.4%4m/s
10:001.5%4.7m/s
11:001.5%5.2m/s
12:001.3%5.8m/s
13:002.6%6.5m/s
14:002.6%7.4m/s
15:002.6%7.6m/s
16:002.6%7.6m/s
17:001.3%7.3m/s
18:001.3%7.5m/s
19:001.3%6.8m/s
20:001.3%6.4m/s
21:001.3%6.3m/s
22:001%6.6m/s
23:001%6.4m/s
Thu, Apr 9
24:000.6%6.4m/s
01:000.6%6m/s
02:000.8%5.4m/s
03:000.6%5.6m/s
04:000.6%5.6m/s
05:000.8%4.8m/s
06:001.2%4.5m/s
07:001%6.1m/s
08:001.2%5.2m/s
09:001.2%4.4m/s
10:001%3.7m/s
11:0022%5.8m/s
12:004.1%7m/s
13:003.7%7.1m/s
14:004.5%7.3m/s
15:003.4%7.3m/s
16:002.7%7.2m/s
17:001.2%5m/s
18:002%7.9m/s
19:002.5%7.7m/s
20:003.2%7.4m/s
21:0022%6.8m/s
22:0022%6.4m/s
23:0038%6.4m/s
Fri, Apr 10
24:0025%5.6m/s
01:0024%4.6m/s
02:0025%4.6m/s
03:0035%3.9m/s
04:0043%3.8m/s
05:0043%3.1m/s
06:0045%2.6m/s
07:0037%2.7m/s
08:0031%2.4m/s
09:0033%2.9m/s
10:0044%3.9m/s
11:0035%4.7m/s
12:0035%4.9m/s
13:0033%5.1m/s
14:0033%4.8m/s
15:0033%5m/s
16:0031%6.8m/s
17:0031%7.9m/s
18:0031%7.2m/s
19:0031%7.4m/s
20:0031%8.7m/s
21:0031%9.9m/s
22:0027%10m/s
23:0022%10m/s
Sat, Apr 11
24:0014%9.3m/s
01:0011%9.2m/s
02:0011%7.6m/s
03:009%5.3m/s
04:0011%3.9m/s
05:0011%3.4m/s
06:0013%3.3m/s
07:0011%4.6m/s
08:0013%6.3m/s
09:009%7.4m/s
10:0011%5.1m/s
11:0015%5.3m/s
12:0025%6.2m/s
13:0030%6.6m/s
14:000%7.9m/s
15:000%9.3m/s
16:000%11m/s
17:000%11m/s
18:000%10m/s
19:000%10m/s
20:000%9.1m/s
21:000%8m/s
22:000%6.8m/s
23:000%6.8m/s
Sun, Apr 12
24:000%6.8m/s
01:000%6.9m/s
02:000%6.8m/s
03:000%6.7m/s
04:000%6.6m/s
05:000%6.3m/s
06:000%6.1m/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
Thu, Apr 9 Sunrise 06:32 Sunset 20:21
09:00
2.9°C 6.3°C 3.9°C - 100% 0.05kPa
10:00
2.9°C 6.1°C 3.7°C - 100% 0.04kPa
11:00
1.8°C 6°C 5°C - 92% 0.18kPa
12:00
1.2°C 6.1°C 6°C - 5% 0.27kPa
13:00
0.1°C 6.2°C 6.4°C - 36% 0.35kPa
14:00
0.1°C 6.5°C 6.7°C - 5% 0.37kPa
15:00
0.2°C 6.7°C 6.8°C - 53% 0.37kPa
16:00
1.8°C 6.8°C 5.9°C - 66% 0.23kPa
17:00
3.7°C 6.8°C 5.4°C - 96% 0.1kPa
18:00
3°C 6.7°C 5.2°C - 35% 0.13kPa
19:00
2°C 6.5°C 5.1°C - 45% 0.18kPa
20:00
1.2°C 6.2°C 4.6°C - 17% 0.18kPa
21:00
0.7°C 5.9°C 4°C - 100% 0.17kPa
22:00
-0.2°C 5.6°C 3.8°C - 100% 0.2kPa
23:00
-1°C 5.3°C 3.5°C - 11% 0.22kPa
Fri, Apr 10 Sunrise 06:32 Sunset 20:21
24:00
-1.9°C 5°C 2.6°C - 67% 0.2kPa
01:00
-1.9°C 4.6°C 2.4°C - 83% 0.2kPa
02:00
-2.3°C 4.3°C 2.3°C - 78% 0.2kPa
03:00
-2.3°C 3.9°C 2°C - 34% 0.19kPa
04:00
-2.4°C 3.6°C 2°C - 6% 0.19kPa
05:00
-2.4°C 3.4°C 1.6°C - 5% 0.17kPa
06:00
-2.3°C 3.3°C 1.1°C - 5% 0.14kPa
07:00
-2.2°C 3.3°C 0.76°C - 6% 0.12kPa
08:00
-1.2°C 3.1°C 2.2°C - 75% 0.15kPa
09:00
-1°C 3.2°C 4.2°C - 98% 0.26kPa
10:00
-1.5°C 3.2°C 5.2°C - 38% 0.33kPa
11:00
-1.6°C 3.3°C 5.9°C - 84% 0.38kPa
12:00
-1.4°C 3.7°C 5.9°C - 100% 0.38kPa
13:00
-1.1°C 4.1°C 6°C - 100% 0.37kPa
14:00
-0.7°C 4.5°C 6.1°C - 100% 0.36kPa
15:00
-1.2°C 4.8°C 6.4°C - 100% 0.4kPa
16:00
-0.4°C 5.1°C 7°C - 100% 0.4kPa
17:00
-0.5°C 5.2°C 6.8°C - 100% 0.4kPa
18:00
-0.9°C 5.4°C 6.5°C - 100% 0.39kPa
19:00
-0.7°C 5.5°C 6.1°C - 99% 0.36kPa
20:00
-1.2°C 5.4°C 5.5°C - 100% 0.35kPa
21:00
-2.2°C 5.2°C 4.6°C - 100% 0.33kPa
22:00
-1.3°C 5.1°C 4.4°C - 100% 0.28kPa
23:00
0.4°C 4.9°C 4°C - 100% 0.19kPa
Sat, Apr 11 Sunrise 06:29 Sunset 20:24
24:00
1.1°C 4.8°C 4.1°C - 100% 0.16kPa
01:00
1.7°C 4.7°C 3.7°C - 100% 0.1kPa
02:00
2.3°C 4.6°C 3.6°C - 100% 0.07kPa
03:00
2.3°C 4.4°C 2.8°C - 100% 0.03kPa
04:00
2°C 4.3°C 2.5°C - 100% 0.03kPa
05:00
1.7°C 4.1°C 2°C - 100% 0.01kPa
06:00
1.7°C 4°C 1.9°C - 99% 0.01kPa
07:00
1.3°C 3.8°C 1.8°C - 100% 0.02kPa
08:00
1.1°C 3.7°C 2.3°C - 98% 0.05kPa
09:00
1.5°C 3.6°C 2°C - 100% 0.03kPa
10:00
0.7°C 3.5°C 1.1°C - 100% 0.02kPa
11:00
0.7°C 3.5°C 2.5°C - 99% 0.08kPa
12:00
-0.3°C 3.5°C 3.3°C - 78% 0.17kPa
13:00
-1.2°C 3.8°C 4.7°C - 74% 0.29kPa
14:00
-0.2°C 3244°C 5.4°C - 83% 0.3kPa
15:00
0.8°C 6485°C 6.2°C - 91% 0.3kPa
16:00
1.8°C 9726°C 6.9°C - 100% 0.3kPa
17:00
1.8°C 9726°C 6.8°C - 99% 0.3kPa
18:00
1.7°C 9726°C 6.8°C - 99% 0.29kPa
19:00
1.7°C 9726°C 6.7°C - 98% 0.29kPa
20:00
1.8°C 9726°C 6.5°C - 98% 0.27kPa
21:00
2°C 9726°C 6.3°C - 98% 0.25kPa
22:00
2.2°C 9726°C 6.1°C - 98% 0.22kPa
23:00
2.1°C 9726°C 6.2°C - 99% 0.23kPa
Sun, Apr 12 Sunrise 06:26 Sunset 20:26
24:00
2°C 9726°C 6.3°C - 99% 0.25kPa
01:00
1.9°C 9726°C 6.4°C - 100% 0.26kPa
02:00
2°C 9726°C 6.7°C - 100% 0.28kPa
03:00
2°C 9726°C 7°C - 100% 0.29kPa
04:00
2.1°C 9726°C 7.2°C - 100% 0.31kPa
05:00
2.3°C 9726°C 7.4°C - 90% 0.31kPa
06:00
2.5°C 9726°C 7.6°C - 80% 0.31kPa
07:00
2.8°C 9726°C 7.7°C - 71% 0.31kPa
08:00
3.1°C 9726°C 7.6°C - 80% 0.28kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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