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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 86% failing

Currently

Real-time conditions
Soil Temperature5.4°C
Dew Point4.5°C (low dew point)
Wind Speed13.7m/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 74 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
Thu, Mar 12
04:0014%13m/s
05:0014%13m/s
06:0011%13m/s
07:0014%14m/s
08:0011%13m/s
09:007%9.5m/s
10:0011%8.9m/s
11:0014%9.9m/s
12:0022%11m/s
13:0028%12m/s
14:0031%11m/s
15:0027%11m/s
16:0027%9.8m/s
17:0042%9.4m/s
18:0027%9.9m/s
19:0027%10m/s
20:0029%11m/s
21:0028%11m/s
22:0042%11m/s
23:0042%12m/s
Fri, Mar 13
24:0033%11m/s
01:0040%12m/s
02:0040%11m/s
03:0029%10m/s
04:0029%10m/s
05:0033%11m/s
06:0036%11m/s
07:0036%11m/s
08:0031%11m/s
09:0016%11m/s
10:0013%9m/s
11:0029%9.5m/s
12:0029%9.5m/s
13:0031%9m/s
14:0042%9.4m/s
15:0042%9.5m/s
16:0042%9.4m/s
17:0037%8.4m/s
18:0037%8.3m/s
19:0037%8.1m/s
20:0029%7.6m/s
21:0028%7m/s
22:0022%7.3m/s
23:0028%6.9m/s
Sat, Mar 14
24:0034%7.1m/s
01:0031%6.7m/s
02:0036%7.7m/s
03:0029%8.3m/s
04:0033%7.7m/s
05:0036%7.5m/s
06:0036%7.2m/s
07:0044%6.8m/s
08:0044%6.6m/s
09:0042%6.2m/s
10:0040%5.5m/s
11:0037%4.9m/s
12:0033%4.1m/s
13:000%5.3m/s
14:000%6.5m/s
15:000%7.8m/s
16:000%7.7m/s
17:000%7.7m/s
18:000%7.6m/s
19:000%7.9m/s
20:000%8.1m/s
21:000%8.4m/s
22:000%8.9m/s
23:000%9.4m/s
Sun, Mar 15
24:000%9.9m/s
01:000%11m/s
02:000%12m/s
03:000%13m/s
04:000%13m/s
05:000%13m/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, Mar 12 Sunrise 06:30 Sunset 17:58
07:00
4.5°C 5.4°C 6.6°C - 100% 0.13kPa
08:00
4.8°C 5.4°C 6.2°C - 100% 0.08kPa
09:00
4.3°C 5.4°C 5.3°C - 100% 0.06kPa
10:00
3°C 5.3°C 4.6°C - 100% 0.09kPa
11:00
3.1°C 5.4°C 5.5°C - 100% 0.14kPa
12:00
2.9°C 5.5°C 6°C - 100% 0.18kPa
13:00
2.1°C 5.6°C 5.9°C - 78% 0.22kPa
14:00
1.1°C 5.9°C 6.2°C - 45% 0.29kPa
15:00
1.4°C 6°C 5.9°C - 100% 0.25kPa
16:00
0.8°C 5.9°C 5.4°C - 87% 0.25kPa
17:00
0.3°C 5.7°C 4.9°C - 5% 0.24kPa
18:00
0.3°C 5.4°C 4.5°C - 100% 0.22kPa
19:00
0.4°C 5.1°C 4.4°C - 100% 0.21kPa
20:00
0.3°C 4.9°C 4.3°C - 34% 0.2kPa
21:00
0.1°C 4.6°C 4.1°C - 62% 0.21kPa
22:00
-0.3°C 4.4°C 4°C - 5% 0.21kPa
23:00
-1°C 4.1°C 3.9°C - 5% 0.24kPa
Fri, Mar 13 Sunrise 06:27 Sunset 18:01
24:00
-1°C 3.9°C 3.8°C - 44% 0.23kPa
01:00
-0.8°C 3.7°C 3.7°C - 12% 0.22kPa
02:00
-1.1°C 3.5°C 3.6°C - 19% 0.23kPa
03:00
-1.8°C 3.4°C 3.5°C - 84% 0.25kPa
04:00
-2.4°C 3.2°C 3.4°C - 100% 0.27kPa
05:00
-2.8°C 3.1°C 3.5°C - 100% 0.29kPa
06:00
-2.2°C 3°C 3.4°C - 100% 0.26kPa
07:00
-1.7°C 2.9°C 3.2°C - 100% 0.23kPa
08:00
-0.4°C 2.9°C 2.9°C - 88% 0.16kPa
09:00
2.1°C 3°C 2.8°C - 100% 0.04kPa
10:00
2.5°C 3.1°C 4.1°C - 100% 0.09kPa
11:00
2°C 3.4°C 5.6°C - 97% 0.21kPa
12:00
1.9°C 3.8°C 6.3°C - 100% 0.25kPa
13:00
1.7°C 4.2°C 6.4°C - 46% 0.27kPa
14:00
1.9°C 4.6°C 6.4°C - 5% 0.26kPa
15:00
2°C 5°C 6.4°C - 5% 0.25kPa
16:00
2.2°C 5.2°C 6°C - 5% 0.22kPa
17:00
1.8°C 5.2°C 5.4°C - 5% 0.2kPa
18:00
1.3°C 5°C 4.9°C - 5% 0.19kPa
19:00
1.6°C 4.8°C 4.7°C - 5% 0.17kPa
20:00
1.4°C 4.5°C 4.8°C - 36% 0.18kPa
21:00
0.9°C 4.4°C 5.1°C - 66% 0.23kPa
22:00
1.4°C 4.2°C 4.7°C - 100% 0.18kPa
23:00
1.3°C 4.1°C 5.1°C - 62% 0.21kPa
Sat, Mar 14 Sunrise 06:24 Sunset 18:03
24:00
0.6°C 4°C 5°C - 26% 0.24kPa
01:00
1.1°C 3.9°C 4.8°C - 33% 0.2kPa
02:00
1.1°C 3.8°C 5.2°C - 39% 0.22kPa
03:00
0.9°C 3.8°C 5.4°C - 97% 0.24kPa
04:00
0.9°C 3.9°C 5.6°C - 45% 0.26kPa
05:00
0.9°C 3.8°C 5.1°C - 39% 0.23kPa
06:00
0.8°C 3.8°C 5.2°C - 38% 0.24kPa
07:00
1.1°C 3.7°C 5.2°C - 5% 0.22kPa
08:00
1.1°C 3.8°C 5.7°C - 6% 0.26kPa
09:00
1.1°C 4.1°C 6.2°C - 5% 0.29kPa
10:00
0.5°C 4.4°C 6.8°C - 35% 0.35kPa
11:00
-0.2°C 4.9°C 7°C - 56% 0.4kPa
12:00
-0.2°C 5.4°C 7.1°C - 89% 0.41kPa
13:00
0.9°C 3246°C 7°C - 91% 0.35kPa
14:00
1.8°C 6486°C 6.9°C - 93% 0.3kPa
15:00
2.7°C 9726°C 6.8°C - 95% 0.25kPa
16:00
2.9°C 9726°C 6.7°C - 94% 0.23kPa
17:00
3°C 9726°C 6.7°C - 92% 0.22kPa
18:00
3.1°C 9726°C 6.6°C - 91% 0.21kPa
19:00
3.1°C 9726°C 6.6°C - 94% 0.21kPa
20:00
3.1°C 9726°C 6.5°C - 97% 0.2kPa
21:00
3.1°C 9726°C 6.5°C - 100% 0.2kPa
22:00
3°C 9726°C 6.4°C - 100% 0.2kPa
23:00
2.9°C 9726°C 6.3°C - 100% 0.2kPa
Sun, Mar 15 Sunrise 06:21 Sunset 18:06
24:00
2.7°C 9726°C 6.2°C - 100% 0.2kPa
01:00
2.6°C 9726°C 6.2°C - 100% 0.21kPa
02:00
2.5°C 9726°C 6.2°C - 100% 0.21kPa
03:00
2.4°C 9726°C 6.2°C - 100% 0.22kPa
04:00
3.1°C 9726°C 5.7°C - 100% 0.15kPa
05:00
3.7°C 9726°C 5.2°C - 100% 0.09kPa
06:00
4.2°C 9726°C 4.6°C - 100% 0.03kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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