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Rule Morning Frost

Loch Lomond - Morning Frost - Scotland

Balloch, 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 94% failing
Time Window 88% failing

Currently

Real-time conditions
Soil Temperature9.2°C
Dew Point5.1°C (moderate dew point)
Wind Speed3.9m/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%0.94m/s
03:000%1.1m/s
04:000%1.2m/s
05:000%1.3m/s
06:000%1.3m/s
07:000%1.3m/s
08:000%1.3m/s
09:000%1.4m/s
10:000%1.9m/s
11:000%3.5m/s
12:000%4.4m/s
13:000%5.2m/s
14:000%4.9m/s
15:000%4.6m/s
16:000%4.3m/s
17:000%4.2m/s
18:000%3.7m/s
19:000%2.7m/s
20:000%1.7m/s
21:000%1.4m/s
22:000%1.3m/s
23:000%1.2m/s
Thu, Apr 9
24:000%1.7m/s
01:000%2.3m/s
02:000%3.3m/s
03:000%3.9m/s
04:000%3.5m/s
05:000%3.6m/s
06:000%2.9m/s
07:000%3.5m/s
08:000%3.8m/s
09:000%6.3m/s
10:000%5.2m/s
11:000%5.4m/s
12:002.6%6.3m/s
13:003%6.8m/s
14:003.7%8.3m/s
15:000%8.3m/s
16:000%8.3m/s
17:000%8.3m/s
18:001.3%7.1m/s
19:001%7m/s
20:001%6m/s
21:001%6m/s
22:001.5%5.6m/s
23:001.5%4.5m/s
Fri, Apr 10
24:003%4.5m/s
01:003.2%3.6m/s
02:0032%2.4m/s
03:0032%2.1m/s
04:0032%1.8m/s
05:0034%1.5m/s
06:0034%1.4m/s
07:0034%1.1m/s
08:0037%0.99m/s
09:0035%1.5m/s
10:0033%2.7m/s
11:0035%3.7m/s
12:0033%4.4m/s
13:0031%4.4m/s
14:0031%4.6m/s
15:0031%4.9m/s
16:0029%6.7m/s
17:0029%6.7m/s
18:0030%6.7m/s
19:0031%6.8m/s
20:0027%6.6m/s
21:0027%6.2m/s
22:0027%6.4m/s
23:0014%6.4m/s
Sat, Apr 11
24:0014%7m/s
01:0011%7.1m/s
02:007%7.3m/s
03:007%7.6m/s
04:007%6.3m/s
05:0012%6.7m/s
06:0018%6.1m/s
07:0015%5.7m/s
08:0034%6.4m/s
09:0042%7.1m/s
10:0042%7.8m/s
11:0036%7.7m/s
12:003.1%7.6m/s
13:002.6%7.5m/s
14:0022%7.2m/s
15:0014%6.8m/s
16:0011%6.5m/s
17:0011%6.7m/s
18:0014%7m/s
19:0014%7.2m/s
20:0014%7.3m/s
21:0014%7.5m/s
22:0014%7.6m/s
23:0011%7.8m/s
Sun, Apr 12
24:0011%8m/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 06:28 Sunset 20:12
03:00
5.1°C 9.2°C 8.7°C - 100% 0.25kPa
04:00
5.7°C 9.1°C 8.2°C - 100% 0.17kPa
05:00
6.6°C 9°C 7.5°C - 100% 0.06kPa
06:00
6.6°C 8.8°C 7°C - 100% 0.03kPa
07:00
6.7°C 8.7°C 7°C - 100% 0.02kPa
08:00
6.8°C 8.5°C 7.1°C - 100% 0.02kPa
09:00
4.1°C 8.4°C 5.5°C - 100% 0.08kPa
10:00
4.2°C 8.1°C 5.7°C - 100% 0.09kPa
11:00
3.7°C 8.1°C 5.8°C - 99% 0.13kPa
12:00
2.8°C 8°C 6.5°C - 100% 0.22kPa
13:00
1.4°C 8°C 7.5°C - 100% 0.36kPa
14:00
1°C 8°C 7.6°C - 28% 0.39kPa
15:00
0.4°C 8.1°C 7.7°C - 18% 0.42kPa
16:00
1.2°C 8.1°C 7.4°C - 21% 0.36kPa
17:00
3.4°C 8.1°C 6.2°C - 97% 0.17kPa
18:00
2.6°C 7.9°C 4.9°C - 84% 0.13kPa
19:00
3.2°C 7.7°C 4.2°C - 100% 0.06kPa
20:00
3.1°C 7.4°C 4.2°C - 93% 0.06kPa
21:00
2.3°C 7.2°C 4.1°C - 94% 0.1kPa
22:00
1.6°C 6.9°C 3.9°C - 82% 0.12kPa
23:00
0.9°C 6.7°C 3.4°C - 100% 0.13kPa
Fri, Apr 10 Sunrise 06:28 Sunset 20:12
24:00
0.2°C 6.4°C 3°C - 5% 0.14kPa
01:00
-0.6°C 6.1°C 2.1°C - 5% 0.13kPa
02:00
-1.1°C 5.7°C 1.1°C - 5% 0.1kPa
03:00
-1.3°C 5.3°C 0.59°C - 5% 0.08kPa
04:00
-1.6°C 5.2°C 0.32°C - 5% 0.08kPa
05:00
-1.8°C 5.1°C 0.05°C - 5% 0.08kPa
06:00
-1.9°C 5.1°C -0.13°C - 5% 0.07kPa
07:00
-1.6°C 5.1°C 0.29°C - 5% 0.08kPa
08:00
-0.6°C 4.9°C 2.1°C - 6% 0.13kPa
09:00
0.1°C 4.9°C 4.1°C - 100% 0.21kPa
10:00
0.1°C 4.9°C 5.1°C - 100% 0.26kPa
11:00
-0.1°C 4.9°C 5.9°C - 100% 0.32kPa
12:00
-0.7°C 4.9°C 6.1°C - 100% 0.36kPa
13:00
-1.6°C 4.9°C 7°C - 100% 0.46kPa
14:00
-2°C 5.1°C 7.6°C - 100% 0.51kPa
15:00
-1.9°C 5.2°C 7.3°C - 100% 0.49kPa
16:00
-1.9°C 5.3°C 7.6°C - 98% 0.51kPa
17:00
-1.1°C 5.5°C 7.5°C - 98% 0.47kPa
18:00
-1.7°C 5.6°C 6.5°C - 64% 0.42kPa
19:00
-1.3°C 5.6°C 5.6°C - 88% 0.35kPa
20:00
-1°C 5.6°C 5°C - 100% 0.3kPa
21:00
-0.2°C 5.5°C 5°C - 98% 0.27kPa
22:00
0.2°C 5.4°C 4.4°C - 100% 0.22kPa
23:00
1.4°C 5.3°C 4.1°C - 100% 0.14kPa
Sat, Apr 11 Sunrise 06:26 Sunset 20:14
24:00
1.6°C 5.3°C 4.1°C - 100% 0.13kPa
01:00
2.2°C 5.2°C 3.8°C - 100% 0.09kPa
02:00
2.3°C 5.1°C 3.3°C - 100% 0.05kPa
03:00
3.1°C 5°C 3.8°C - 100% 0.04kPa
04:00
2.4°C 4.9°C 2.9°C - 100% 0.02kPa
05:00
1.5°C 4.8°C 2.7°C - 79% 0.06kPa
06:00
0.7°C 4.7°C 2.8°C - 26% 0.1kPa
07:00
0.5°C 4.5°C 2.4°C - 45% 0.09kPa
08:00
-0.1°C 4.9°C 4.1°C - 32% 0.21kPa
09:00
-1.1°C 5.4°C 5.8°C - 18% 0.36kPa
10:00
-2.8°C 5.9°C 7.5°C - 4% 0.54kPa
11:00
-1.3°C 5.9°C 6.8°C - 36% 0.43kPa
12:00
-0.1°C 6°C 6.1°C - 68% 0.34kPa
13:00
0.8°C 6.1°C 5.4°C - 100% 0.25kPa
14:00
1.5°C 6°C 4.9°C - 100% 0.18kPa
15:00
2.2°C 5.9°C 4.3°C - 100% 0.12kPa
16:00
2.7°C 5.8°C 3.8°C - 100% 0.06kPa
17:00
2.9°C 5.8°C 4.5°C - 100% 0.09kPa
18:00
3.2°C 5.7°C 5.1°C - 100% 0.11kPa
19:00
3.4°C 5.6°C 5.8°C - 100% 0.14kPa
20:00
3.5°C 5.6°C 5.7°C - 100% 0.13kPa
21:00
3.6°C 5.6°C 5.6°C - 100% 0.12kPa
22:00
3.7°C 5.5°C 5.5°C - 100% 0.11kPa
23:00
3.1°C 5.5°C 4.7°C - 100% 0.09kPa
Sun, Apr 12 Sunrise 06:23 Sunset 20:16
24:00
2.5°C 5.4°C 3.9°C - 100% 0.08kPa
01:00
1.9°C 5.3°C 3.1°C - 100% 0.06kPa
02:00
2.6°C 5.2°C 3.7°C - 100% 0.06kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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