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Rule Morning Frost

Shetland Islands - Morning Frost - Scotland

Lerwick, 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 Temperature4.6°C
Dew Point2.1°C (low dew point)
Wind Speed7.3m/s (moderate winds)
Cloud Cover98%

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
Sat, Mar 14
13:0031%6.3m/s
14:003%6m/s
15:002.6%5.9m/s
16:003.7%5.7m/s
17:004.3%5.2m/s
18:0044%4.6m/s
19:0044%4.6m/s
20:0044%4.7m/s
21:0039%4.4m/s
22:0035%4.5m/s
23:0024%4.9m/s
Sun, Mar 15
24:0024%5m/s
01:0022%6.3m/s
02:0022%7.1m/s
03:0022%7.8m/s
04:0024%8m/s
05:0024%8.5m/s
06:0024%9.8m/s
07:0029%10m/s
08:0011%12m/s
09:007%11m/s
10:007%12m/s
11:0011%8.9m/s
12:0014%9.8m/s
13:0022%7.3m/s
14:0038%10m/s
15:0027%10m/s
16:0031%11m/s
17:0038%10m/s
18:0027%9.8m/s
19:0027%10m/s
20:0027%10m/s
21:0028%9.9m/s
22:0030%9.6m/s
23:0033%9.9m/s
Mon, Mar 16
24:0029%9.9m/s
01:0029%10m/s
02:0029%10m/s
03:0040%11m/s
04:0042%11m/s
05:0023%12m/s
06:0016%12m/s
07:0013%12m/s
08:0013%13m/s
09:0013%13m/s
10:0013%14m/s
11:0016%14m/s
12:0014%14m/s
13:0014%13m/s
14:0015%12m/s
15:0021%12m/s
16:0022%11m/s
17:0027%10m/s
18:0022%9.1m/s
19:0014%8.5m/s
20:0014%8.9m/s
21:0011%10m/s
22:0011%10m/s
23:007%11m/s
Tue, Mar 17
24:0011%11m/s
01:0011%10m/s
02:007%9.1m/s
03:007%9m/s
04:000.6%8.9m/s
05:001.3%9.3m/s
06:001.3%9.9m/s
07:001.3%10m/s
08:001.3%10m/s
09:001.3%9.9m/s
10:002.6%10m/s
11:002.6%11m/s
12:002.6%11m/s
13:002.6%11m/s
14:002.6%12m/s
15:002.6%11m/s
16:001%10m/s
17:001.3%11m/s
18:001.3%9.8m/s
19:000%11m/s
20:000%11m/s
21:000%12m/s
22:000%13m/s
23:000%13m/s
Wed, Mar 18
24:000%13m/s
01:000%13m/s
02:000%13m/s
03:000%13m/s
04:000%13m/s
05:000%13m/s
06:000%13m/s
07:000%12m/s
08:000%12m/s
09:000%11m/s
10:000%10m/s
11:000%9.3m/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
Sun, Mar 15 Sunrise 06:21 Sunset 18:06
13:00
2.1°C 4.6°C 5.4°C - 98% 0.18kPa
14:00
2.1°C 4.9°C 6°C - 18% 0.22kPa
15:00
1.6°C 5.2°C 5.7°C - 80% 0.23kPa
16:00
1.2°C 5.2°C 5.2°C - 41% 0.22kPa
17:00
0.6°C 5.1°C 4.8°C - 23% 0.22kPa
18:00
0.1°C 4.8°C 4.3°C - 90% 0.22kPa
19:00
-0.3°C 4.6°C 4.2°C - 100% 0.22kPa
20:00
-0.9°C 4.3°C 4°C - 99% 0.24kPa
21:00
-1.4°C 4.1°C 3.9°C - 75% 0.26kPa
22:00
-1.6°C 3.8°C 3.8°C - 72% 0.26kPa
23:00
-1.5°C 3.6°C 3.7°C - 46% 0.25kPa
Mon, Mar 16 Sunrise 06:18 Sunset 18:08
24:00
-1.5°C 3.4°C 3.7°C - 100% 0.25kPa
01:00
-1.3°C 3.2°C 3.7°C - 100% 0.24kPa
02:00
-0.9°C 3.1°C 3.9°C - 100% 0.24kPa
03:00
-0.2°C 3°C 4°C - 14% 0.21kPa
04:00
0.3°C 3°C 4°C - 15% 0.18kPa
05:00
1.7°C 2.9°C 3.7°C - 94% 0.11kPa
06:00
2.8°C 3°C 3.3°C - 100% 0.03kPa
07:00
2.7°C 3°C 4.5°C - 99% 0.1kPa
08:00
3.2°C 3.2°C 4.3°C - 100% 0.06kPa
09:00
3.1°C 3.4°C 4.6°C - 100% 0.09kPa
10:00
3.4°C 3.5°C 5.1°C - 100% 0.1kPa
11:00
3.1°C 3.6°C 5.8°C - 100% 0.16kPa
12:00
3.3°C 4.1°C 6.3°C - 100% 0.18kPa
13:00
3.8°C 4.5°C 6.8°C - 86% 0.19kPa
14:00
4°C 4.9°C 7°C - 79% 0.19kPa
15:00
3.9°C 5.1°C 6.9°C - 31% 0.18kPa
16:00
3.6°C 5.4°C 6.9°C - 99% 0.2kPa
17:00
3.2°C 5.5°C 6.7°C - 82% 0.21kPa
18:00
3°C 5.4°C 6.2°C - 98% 0.19kPa
19:00
3.6°C 5.3°C 6.1°C - 100% 0.15kPa
20:00
3.9°C 5.2°C 5.8°C - 100% 0.12kPa
21:00
4.5°C 5.2°C 5.8°C - 100% 0.08kPa
22:00
4.8°C 5.2°C 5.9°C - 100% 0.07kPa
23:00
5.4°C 5.2°C 6.2°C - 100% 0.05kPa
Tue, Mar 17 Sunrise 06:15 Sunset 18:11
24:00
5.7°C 5.3°C 6.8°C - 100% 0.07kPa
01:00
6.4°C 5.4°C 7.5°C - 100% 0.07kPa
02:00
7.1°C 5.6°C 7.8°C - 100% 0.05kPa
03:00
7.3°C 5.8°C 7.9°C - 100% 0.05kPa
04:00
7.3°C 6°C 8.3°C - 100% 0.07kPa
05:00
6.8°C 6.2°C 8.4°C - 100% 0.12kPa
06:00
6.4°C 6.3°C 8.8°C - 100% 0.17kPa
07:00
6.1°C 6.5°C 8.5°C - 100% 0.17kPa
08:00
5.9°C 6.7°C 8.8°C - 100% 0.2kPa
09:00
6°C 6.9°C 8.8°C - 100% 0.2kPa
10:00
6.1°C 7°C 9.2°C - 100% 0.22kPa
11:00
6.1°C 7.3°C 9.1°C - 100% 0.21kPa
12:00
6°C 7.4°C 9.2°C - 100% 0.22kPa
13:00
6.1°C 7.5°C 9.5°C - 100% 0.24kPa
14:00
6°C 7.7°C 9.7°C - 100% 0.26kPa
15:00
6.2°C 7.8°C 9.4°C - 100% 0.23kPa
16:00
6.9°C 7.8°C 8.4°C - 100% 0.1kPa
17:00
6.1°C 7.8°C 8.5°C - 100% 0.16kPa
18:00
5.8°C 7.7°C 8.1°C - 100% 0.16kPa
19:00
5.1°C 3247°C 8°C - 97% 0.19kPa
20:00
4.5°C 6486°C 7.8°C - 95% 0.22kPa
21:00
3.8°C 9726°C 7.7°C - 92% 0.25kPa
22:00
3.8°C 9726°C 7.7°C - 62% 0.24kPa
23:00
3.9°C 9726°C 7.6°C - 33% 0.24kPa
Wed, Mar 18 Sunrise 06:12 Sunset 18:13
24:00
3.9°C 9726°C 7.5°C - 3% 0.23kPa
01:00
4.1°C 9726°C 7.5°C - 3% 0.22kPa
02:00
4.4°C 9726°C 7.5°C - 4% 0.2kPa
03:00
4.6°C 9726°C 7.5°C - 5% 0.19kPa
04:00
4.7°C 9726°C 7.5°C - 37% 0.18kPa
05:00
4.9°C 9726°C 7.5°C - 68% 0.17kPa
06:00
5°C 9726°C 7.5°C - 100% 0.16kPa
07:00
5.2°C 9726°C 7.5°C - 88% 0.15kPa
08:00
5.4°C 9726°C 7.5°C - 77% 0.14kPa
09:00
5.6°C 9726°C 7.5°C - 65% 0.13kPa
10:00
5.6°C 9726°C 7.5°C - 77% 0.13kPa
11:00
5.6°C 9726°C 7.5°C - 88% 0.12kPa
12:00
5.7°C 9726°C 7.5°C - 100% 0.12kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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