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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 Temperature7.5°C
Dew Point6.9°C (moderate dew point)
Wind Speed3.2m/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 92 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
05:000.6%7.5m/s
06:000.6%6.7m/s
07:000.6%6m/s
08:000.6%6.4m/s
09:000.6%5.9m/s
10:000.9%4.6m/s
11:001.6%4.4m/s
12:001.5%4.2m/s
13:000%3.6m/s
14:000%3.5m/s
15:000%3.7m/s
16:000%3.9m/s
17:000%4.1m/s
18:000%3.8m/s
19:000%3.2m/s
20:000%5.3m/s
21:000%5.2m/s
22:000%5.9m/s
23:000%5.8m/s
Thu, Apr 9
24:000.8%4.9m/s
01:001%4m/s
02:001%3.6m/s
03:001%3.2m/s
04:001%3.5m/s
05:000.8%4.5m/s
06:000.6%5.8m/s
07:000.6%6.3m/s
08:000.6%5.7m/s
09:000.8%4.8m/s
10:000.6%6.1m/s
11:000.8%5.1m/s
12:001%7.9m/s
13:001%6m/s
14:001.3%6.3m/s
15:001.3%6.3m/s
16:002.1%7.2m/s
17:002.6%6.6m/s
18:002.6%6.8m/s
19:002.6%6.6m/s
20:004.1%6m/s
21:0037%5.8m/s
22:0037%6.2m/s
23:0018%7.6m/s
Fri, Apr 10
24:0023%8.6m/s
01:0029%6.4m/s
02:0028%5.1m/s
03:0022%5.8m/s
04:0011%7.8m/s
05:0024%5m/s
06:0030%4m/s
07:0031%3.7m/s
08:0029%4.9m/s
09:0031%6.1m/s
10:0031%5.7m/s
11:0046%5.9m/s
12:0044%5.7m/s
13:0044%5.8m/s
14:004.3%5.6m/s
15:004.5%5.1m/s
16:004.5%4.7m/s
17:004.5%4.6m/s
18:004.7%4.3m/s
19:004.3%4.2m/s
20:004.3%4.8m/s
21:002.7%5.7m/s
22:0027%6.5m/s
23:0031%7m/s
Sat, Apr 11
24:0042%7.7m/s
01:0028%8.5m/s
02:0027%9.2m/s
03:0022%10m/s
04:0022%11m/s
05:0014%12m/s
06:0014%14m/s
07:0014%14m/s
08:000%15m/s
09:000%16m/s
10:000%17m/s
11:000%17m/s
12:000%16m/s
13:000%16m/s
14:000%14m/s
15:000%12m/s
16:000%10m/s
17:000%10m/s
18:000%11m/s
19:000%11m/s
20:000%12m/s
21:000%13m/s
22:000%14m/s
23:000%14m/s
Sun, Apr 12
24:000%15m/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 06:05 Sunset 20:07
03:00
6.9°C 7.5°C 7.2°C - 100% 0.02kPa
04:00
6.8°C 7.5°C 7.1°C - 100% 0.02kPa
05:00
6.7°C 7.4°C 7.1°C - 100% 0.03kPa
06:00
6.6°C 7.3°C 7.1°C - 100% 0.03kPa
07:00
6.5°C 7.2°C 7.1°C - 100% 0.04kPa
08:00
6.5°C 7.2°C 7°C - 100% 0.04kPa
09:00
6.4°C 7.1°C 7°C - 100% 0.04kPa
10:00
6.7°C 7.1°C 7°C - 100% 0.03kPa
11:00
6.7°C 7.1°C 7°C - 100% 0.02kPa
12:00
5.3°C 7.1°C 6.4°C - 100% 0.07kPa
13:00
4.4°C 6.9°C 5.9°C - 100% 0.09kPa
14:00
4.7°C 6.8°C 6.4°C - 100% 0.11kPa
15:00
4.6°C 6.8°C 6.4°C - 100% 0.11kPa
16:00
3.6°C 6.8°C 6.7°C - 100% 0.19kPa
17:00
2.5°C 6.7°C 6.4°C - 100% 0.23kPa
18:00
2.6°C 6.7°C 6.3°C - 100% 0.22kPa
19:00
1.7°C 6.5°C 6°C - 89% 0.25kPa
20:00
1.7°C 6.3°C 5.5°C - 4% 0.21kPa
21:00
1.7°C 5.9°C 5.1°C - 4% 0.19kPa
22:00
1.8°C 5.7°C 5°C - 4% 0.17kPa
23:00
2.5°C 5.4°C 5°C - 47% 0.14kPa
Fri, Apr 10 Sunrise 06:05 Sunset 20:07
24:00
2.5°C 5.2°C 5.7°C - 62% 0.18kPa
01:00
2.3°C 5.2°C 5.4°C - 36% 0.18kPa
02:00
1.4°C 5°C 4.9°C - 58% 0.19kPa
03:00
1.3°C 4.8°C 4.9°C - 100% 0.19kPa
04:00
2.4°C 4.7°C 3.9°C - 100% 0.08kPa
05:00
0.9°C 4.6°C 4.6°C - 96% 0.2kPa
06:00
0.7°C 4.5°C 4.4°C - 58% 0.19kPa
07:00
0.2°C 4.3°C 4.2°C - 100% 0.21kPa
08:00
-0.3°C 4.3°C 5.3°C - 98% 0.29kPa
09:00
-0.3°C 4.5°C 5.8°C - 100% 0.33kPa
10:00
-0.8°C 4.7°C 6.1°C - 89% 0.36kPa
11:00
-1.1°C 5.1°C 6.4°C - 5% 0.4kPa
12:00
-1.1°C 5.5°C 6.7°C - 5% 0.42kPa
13:00
-1°C 6°C 7°C - 5% 0.43kPa
14:00
-1°C 6.4°C 7.1°C - 5% 0.44kPa
15:00
-1.4°C 6.8°C 7°C - 5% 0.45kPa
16:00
-1.4°C 7.1°C 6.9°C - 5% 0.44kPa
17:00
-1.2°C 7.2°C 6.6°C - 5% 0.41kPa
18:00
-0.9°C 7.2°C 6.1°C - 5% 0.37kPa
19:00
-0.2°C 7°C 5.4°C - 5% 0.29kPa
20:00
-0.3°C 6.6°C 4.5°C - 5% 0.24kPa
21:00
-0.3°C 6.2°C 4.1°C - 72% 0.23kPa
22:00
-0.7°C 5.8°C 4.2°C - 98% 0.24kPa
23:00
-0.7°C 5.5°C 4.3°C - 45% 0.25kPa
Sat, Apr 11 Sunrise 06:02 Sunset 20:10
24:00
-0.6°C 5.2°C 4.3°C - 10% 0.24kPa
01:00
-0.4°C 4.9°C 4.3°C - 66% 0.24kPa
02:00
-0.2°C 4.7°C 4.4°C - 94% 0.23kPa
03:00
0.6°C 4.6°C 4.5°C - 100% 0.2kPa
04:00
1.3°C 4.5°C 4.6°C - 100% 0.17kPa
05:00
1.8°C 4.4°C 4.7°C - 100% 0.15kPa
06:00
1.8°C 4.4°C 4.7°C - 100% 0.16kPa
07:00
2.2°C 4.4°C 4.6°C - 100% 0.13kPa
08:00
3.1°C 3245°C 4.9°C - 100% 0.1kPa
09:00
3.9°C 6485°C 5.2°C - 100% 0.07kPa
10:00
4.8°C 9726°C 5.5°C - 100% 0.04kPa
11:00
4.9°C 9726°C 5.6°C - 100% 0.05kPa
12:00
4.9°C 9726°C 5.8°C - 100% 0.05kPa
13:00
5°C 9726°C 5.9°C - 100% 0.05kPa
14:00
4°C 9726°C 5.8°C - 68% 0.11kPa
15:00
2.9°C 9726°C 5.6°C - 35% 0.16kPa
16:00
1.8°C 9726°C 5.5°C - 3% 0.21kPa
17:00
2.3°C 9726°C 5.8°C - 2% 0.2kPa
18:00
2.7°C 9726°C 6°C - 1% 0.19kPa
19:00
3.2°C 9726°C 6.3°C - 0% 0.19kPa
20:00
3.3°C 9726°C 6.3°C - 2% 0.18kPa
21:00
3.3°C 9726°C 6.3°C - 3% 0.18kPa
22:00
3.4°C 9726°C 6.3°C - 5% 0.18kPa
23:00
3.7°C 9726°C 6.3°C - 35% 0.16kPa
Sun, Apr 12 Sunrise 05:59 Sunset 20:12
24:00
4°C 9726°C 6.4°C - 66% 0.15kPa
01:00
4.3°C 9726°C 6.4°C - 96% 0.13kPa
02:00
4.3°C 9726°C 6.5°C - 97% 0.13kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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