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Rule Morning Frost

Isle of Lewis - Morning Frost - Scotland

Stornoway, 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 83% failing

Currently

Real-time conditions
Soil Temperature4.8°C
Dew Point1.1°C (low dew point)
Wind Speed10.9m/s (moderate winds)
Cloud Cover76%

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
Thu, Mar 12
13:003.7%11m/s
14:003%11m/s
15:004.1%11m/s
16:004.1%11m/s
17:0034%11m/s
18:0031%10m/s
19:0042%10m/s
20:0032%10m/s
21:0042%10m/s
22:0031%11m/s
23:0027%10m/s
Fri, Mar 13
24:0024%10m/s
01:009%11m/s
02:009%11m/s
03:009%7.8m/s
04:0015%4.9m/s
05:0024%6.4m/s
06:0024%6.5m/s
07:0031%6.8m/s
08:0044%7.3m/s
09:0029%8.1m/s
10:0030%9.4m/s
11:0042%9.8m/s
12:0042%11m/s
13:0028%11m/s
14:0011%11m/s
15:0011%10m/s
16:0027%12m/s
17:0027%11m/s
18:0031%10m/s
19:0028%9.7m/s
20:0028%9.8m/s
21:0042%9.1m/s
22:0034%8.4m/s
23:0030%8.3m/s
Sat, Mar 14
24:0029%8.1m/s
01:0029%7.8m/s
02:0029%7.7m/s
03:0033%7.8m/s
04:0044%7.4m/s
05:0040%7.3m/s
06:0029%7m/s
07:0029%6.6m/s
08:0029%7.1m/s
09:0029%7.5m/s
10:0029%7.4m/s
11:0035%7.5m/s
12:0031%7.5m/s
13:0044%7.5m/s
14:0036%7.5m/s
15:0046%7.1m/s
16:0042%6.3m/s
17:0040%5.4m/s
18:0030%4.5m/s
19:0026%3.5m/s
20:0018%3.5m/s
21:0018%3.7m/s
22:0026%4.1m/s
23:0024%4.8m/s
Sun, Mar 15
24:0023%5.8m/s
01:0022%6.3m/s
02:0014%8.3m/s
03:0011%9.2m/s
04:0011%11m/s
05:0011%12m/s
06:0014%9m/s
07:0031%9.7m/s
08:0027%8.7m/s
09:0027%9.6m/s
10:0022%8.7m/s
11:0027%9.7m/s
12:0031%10m/s
13:0027%11m/s
14:0031%11m/s
15:0027%11m/s
16:0027%11m/s
17:0027%10m/s
18:0028%10m/s
19:000%12m/s
20:000%13m/s
21:000%14m/s
22:000%14m/s
23:000%14m/s
Mon, Mar 16
24:000%14m/s
01:000%14m/s
02:000%13m/s
03:000%13m/s
04:000%12m/s
05:000%11m/s
06:000%10m/s
07:000%9.7m/s
08:000%9.1m/s
09:000%8.6m/s
10:000%8.3m/s
11:000%7.9m/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
Fri, Mar 13 Sunrise 06:47 Sunset 18:23
13:00
1.1°C 4.8°C 6.4°C - 76% 0.3kPa
14:00
2.9°C 5°C 4.7°C - 100% 0.1kPa
15:00
2.7°C 5°C 4.1°C - 100% 0.08kPa
16:00
0.5°C 4.9°C 4.6°C - 100% 0.21kPa
17:00
0.4°C 4.8°C 5°C - 100% 0.24kPa
18:00
0°C 4.7°C 4.7°C - 46% 0.25kPa
19:00
-0.4°C 4.5°C 4.4°C - 79% 0.24kPa
20:00
-0.7°C 4.4°C 4.4°C - 79% 0.25kPa
21:00
-1°C 4.2°C 4.5°C - 8% 0.28kPa
22:00
-0.8°C 4.1°C 4.2°C - 28% 0.25kPa
23:00
-0.8°C 3.9°C 4.2°C - 63% 0.25kPa
Sat, Mar 14 Sunrise 06:44 Sunset 18:25
24:00
-0.8°C 3.8°C 4.2°C - 98% 0.25kPa
01:00
-0.9°C 3.7°C 4.2°C - 99% 0.25kPa
02:00
-1°C 3.6°C 4.2°C - 98% 0.25kPa
03:00
-1.1°C 3.5°C 4.1°C - 57% 0.26kPa
04:00
-1.1°C 3.4°C 4.1°C - 6% 0.25kPa
05:00
-1.1°C 3.3°C 4.1°C - 24% 0.25kPa
06:00
-0.8°C 3.2°C 4°C - 97% 0.24kPa
07:00
-0.4°C 3.1°C 4°C - 98% 0.22kPa
08:00
0.1°C 3.2°C 4.8°C - 100% 0.24kPa
09:00
0.3°C 3.3°C 5.6°C - 100% 0.28kPa
10:00
0.7°C 3.7°C 6.2°C - 100% 0.3kPa
11:00
0.7°C 4.1°C 6.7°C - 46% 0.34kPa
12:00
-0.1°C 4.6°C 7.1°C - 81% 0.4kPa
13:00
-0.5°C 5°C 7.3°C - 9% 0.43kPa
14:00
0°C 5.5°C 7.4°C - 32% 0.42kPa
15:00
0.6°C 5.8°C 7.2°C - 9% 0.38kPa
16:00
0.8°C 6°C 6.8°C - 5% 0.34kPa
17:00
0.8°C 6°C 6.1°C - 15% 0.29kPa
18:00
0.6°C 5.8°C 5°C - 68% 0.23kPa
19:00
0.7°C 5.4°C 3.7°C - 100% 0.15kPa
20:00
0.9°C 5.1°C 3.5°C - 100% 0.13kPa
21:00
1.1°C 4.8°C 3.8°C - 100% 0.14kPa
22:00
1.3°C 4.6°C 4.4°C - 100% 0.16kPa
23:00
1.5°C 4.5°C 4.7°C - 100% 0.17kPa
Sun, Mar 15 Sunrise 06:42 Sunset 18:27
24:00
1.5°C 4.4°C 5°C - 75% 0.19kPa
01:00
1.7°C 4.3°C 4.8°C - 100% 0.17kPa
02:00
2.4°C 4.3°C 5.1°C - 100% 0.15kPa
03:00
3.5°C 4.3°C 4.7°C - 100% 0.06kPa
04:00
4.1°C 4.3°C 5.1°C - 100% 0.06kPa
05:00
4.9°C 4.4°C 6.1°C - 100% 0.08kPa
06:00
4.2°C 4.6°C 6.8°C - 95% 0.16kPa
07:00
1.8°C 4.7°C 5.6°C - 46% 0.21kPa
08:00
0.9°C 4.6°C 4.9°C - 80% 0.21kPa
09:00
1.2°C 4.6°C 5.2°C - 100% 0.21kPa
10:00
1.7°C 4.7°C 4.9°C - 100% 0.17kPa
11:00
0.4°C 4.9°C 5.6°C - 100% 0.28kPa
12:00
0.2°C 5.1°C 5.8°C - 46% 0.3kPa
13:00
-0.1°C 5.5°C 5.8°C - 93% 0.32kPa
14:00
-0.5°C 5.6°C 5.6°C - 100% 0.32kPa
15:00
-0.6°C 5.7°C 5°C - 100% 0.28kPa
16:00
-1.4°C 5.6°C 4.4°C - 92% 0.29kPa
17:00
-1.2°C 5.4°C 3.6°C - 100% 0.23kPa
18:00
-1.8°C 5.1°C 3.2°C - 74% 0.23kPa
19:00
-0.4°C 3245°C 3.8°C - 83% 0.21kPa
20:00
0.9°C 6486°C 4.4°C - 91% 0.18kPa
21:00
2.3°C 9726°C 5°C - 100% 0.15kPa
22:00
2.4°C 9726°C 5.1°C - 100% 0.15kPa
23:00
2.5°C 9726°C 5.3°C - 100% 0.16kPa
Mon, Mar 16 Sunrise 06:39 Sunset 18:30
24:00
2.7°C 9726°C 5.4°C - 100% 0.16kPa
01:00
2.7°C 9726°C 5.7°C - 90% 0.17kPa
02:00
2.7°C 9726°C 6°C - 80% 0.19kPa
03:00
2.8°C 9726°C 6.2°C - 70% 0.21kPa
04:00
3.1°C 9726°C 6.6°C - 76% 0.21kPa
05:00
3.5°C 9726°C 7.1°C - 82% 0.22kPa
06:00
3.9°C 9726°C 7.5°C - 88% 0.23kPa
07:00
3.8°C 9726°C 7.6°C - 90% 0.24kPa
08:00
3.8°C 9726°C 7.7°C - 91% 0.25kPa
09:00
3.7°C 9726°C 7.9°C - 93% 0.27kPa
10:00
3.8°C 9726°C 7.2°C - 95% 0.22kPa
11:00
3.8°C 9726°C 6.6°C - 98% 0.17kPa
12:00
3.8°C 9726°C 5.9°C - 100% 0.13kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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