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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 90% failing
Time Window 88% failing

Currently

Real-time conditions
Soil Temperature5.6°C
Dew Point1.7°C (low dew point)
Wind Speed1.5m/s (calm conditions)
Cloud Cover26%

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
Sun, Apr 19
09:0050%1.5m/s
10:0044%2m/s
11:0035%2.2m/s
12:003.4%2.1m/s
13:003.6%1.5m/s
14:003.6%1.5m/s
15:003.6%1.1m/s
16:003.6%0.95m/s
17:003.6%1.7m/s
18:003.2%2.2m/s
19:003.2%1.9m/s
20:003.9%1.8m/s
21:004.2%2m/s
22:003.4%1.8m/s
23:002.8%1.4m/s
Mon, Apr 20
24:002.2%0.96m/s
01:002.4%0.64m/s
02:003.1%0.12m/s
03:003.1%0.48m/s
04:003.1%0.57m/s
05:002.9%0.85m/s
06:0030%1.1m/s
07:0030%1.2m/s
08:0036%1.3m/s
09:0042%1.5m/s
10:0036%1.8m/s
11:003.4%1.8m/s
12:003.5%1.7m/s
13:003.1%2m/s
14:003.1%2.3m/s
15:003.2%2.9m/s
16:003.2%4m/s
17:002.8%4.4m/s
18:002.8%4.5m/s
19:002.8%4.3m/s
20:003%4m/s
21:001.7%3.4m/s
22:001.7%2.7m/s
23:002.7%2.6m/s
Tue, Apr 21
24:002.7%2.1m/s
01:002.3%1.8m/s
02:001.5%1.7m/s
03:001.6%1.8m/s
04:002%2.3m/s
05:0018%2.6m/s
06:0017%2.1m/s
07:0017%2m/s
08:0015%2.8m/s
09:0017%4.9m/s
10:0034%6.3m/s
11:003.4%6.9m/s
12:002.9%7.2m/s
13:003.2%6.9m/s
14:003.6%6.6m/s
15:003.2%6.4m/s
16:004.3%6.5m/s
17:004.3%6.1m/s
18:004.3%5.7m/s
19:004.7%5.1m/s
20:004.3%4.5m/s
21:004.5%3.4m/s
22:003.2%2.9m/s
23:003.1%2.5m/s
Wed, Apr 22
24:003.1%2.3m/s
01:003.1%2.1m/s
02:0028%2.1m/s
03:0028%2m/s
04:0017%2.2m/s
05:0013%2.5m/s
06:0016%4.2m/s
07:0029%5.2m/s
08:0029%5.5m/s
09:0030%5.4m/s
10:0029%5.5m/s
11:0035%5.5m/s
12:002.9%5.8m/s
13:002.9%5.9m/s
14:002.9%5.7m/s
15:003.5%5.6m/s
16:003%5.6m/s
17:003%5.3m/s
18:003.4%5m/s
19:004.5%4m/s
20:004%3.2m/s
21:003.1%2.3m/s
22:0030%1.4m/s
23:0030%1.4m/s
Thu, Apr 23
24:0030%1.3m/s
01:0030%1.2m/s
02:0037%1.3m/s
03:0050%1.4m/s
04:0050%1.5m/s
05:004.9%1.8m/s
06:004.6%2.1m/s
07:004.2%2.4m/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
Mon, Apr 20 Sunrise 06:00 Sunset 20:34
09:00
1.7°C 5.6°C 7.2°C - 26% 0.33kPa
10:00
1.6°C 5.9°C 8.6°C - 68% 0.43kPa
11:00
1.3°C 6.2°C 9.6°C - 82% 0.53kPa
12:00
1.1°C 6.6°C 10°C - 77% 0.6kPa
13:00
1°C 7°C 11°C - 84% 0.64kPa
14:00
1.1°C 7.3°C 11°C - 100% 0.61kPa
15:00
1.8°C 7.5°C 10°C - 100% 0.55kPa
16:00
2.8°C 7.7°C 10°C - 100% 0.48kPa
17:00
3.2°C 7.8°C 9.2°C - 100% 0.39kPa
18:00
3.4°C 7.9°C 8.7°C - 100% 0.35kPa
19:00
3.6°C 7.9°C 7.9°C - 100% 0.27kPa
20:00
2.9°C 7.8°C 6.7°C - 100% 0.22kPa
21:00
3°C 7.7°C 5.6°C - 100% 0.15kPa
22:00
3.1°C 7.4°C 4.5°C - 66% 0.08kPa
23:00
2.9°C 7.2°C 3.7°C - 8% 0.04kPa
Tue, Apr 21 Sunrise 06:00 Sunset 20:34
24:00
2.6°C 6.9°C 3.1°C - 7% 0.03kPa
01:00
2.2°C 6.6°C 2.7°C - 17% 0.02kPa
02:00
2.1°C 6.3°C 2.7°C - 78% 0.03kPa
03:00
2.9°C 6.2°C 4.1°C - 100% 0.07kPa
04:00
3.4°C 6.1°C 4.9°C - 40% 0.09kPa
05:00
2.5°C 5.9°C 3.8°C - 73% 0.07kPa
06:00
2.9°C 5.8°C 4.5°C - 100% 0.09kPa
07:00
3.7°C 5.7°C 5.1°C - 100% 0.08kPa
08:00
4.1°C 5.7°C 5.5°C - 100% 0.09kPa
09:00
4°C 5.7°C 5.8°C - 49% 0.1kPa
10:00
3.4°C 5.9°C 7.7°C - 33% 0.27kPa
11:00
2.6°C 6.1°C 8.7°C - 47% 0.39kPa
12:00
1.7°C 6.4°C 9.6°C - 76% 0.5kPa
13:00
1.3°C 6.7°C 10°C - 55% 0.58kPa
14:00
1.1°C 7°C 11°C - 23% 0.61kPa
15:00
1°C 7.3°C 11°C - 27% 0.61kPa
16:00
1°C 7.6°C 10°C - 7% 0.59kPa
17:00
1.1°C 7.7°C 9.8°C - 5% 0.55kPa
18:00
1.4°C 7.8°C 9°C - 3% 0.47kPa
19:00
1.3°C 7.8°C 7.8°C - 0% 0.39kPa
20:00
0.8°C 7.7°C 6.3°C - 0% 0.31kPa
21:00
0.6°C 7.5°C 4.7°C - 0% 0.21kPa
22:00
0.8°C 7.2°C 3.6°C - 0% 0.14kPa
23:00
0.7°C 6.9°C 2.8°C - 0% 0.1kPa
Wed, Apr 22 Sunrise 05:58 Sunset 20:37
24:00
0.7°C 6.6°C 2.3°C - 0% 0.08kPa
01:00
0.7°C 6.3°C 1.9°C - 0% 0.06kPa
02:00
0.7°C 5.9°C 1.7°C - 0% 0.05kPa
03:00
0.7°C 5.6°C 1.5°C - 7% 0.04kPa
04:00
0.7°C 5.4°C 1.4°C - 47% 0.03kPa
05:00
1.3°C 5.1°C 2.2°C - 93% 0.04kPa
06:00
1.9°C 5.1°C 4.6°C - 99% 0.15kPa
07:00
1.8°C 5.1°C 5.6°C - 99% 0.21kPa
08:00
1.7°C 5.2°C 6.4°C - 90% 0.27kPa
09:00
1.9°C 5.3°C 7.1°C - 76% 0.31kPa
10:00
2.2°C 5.6°C 8.1°C - 98% 0.36kPa
11:00
2.7°C 5.8°C 9.4°C - 59% 0.44kPa
12:00
3.1°C 6.2°C 10°C - 77% 0.49kPa
13:00
3.2°C 6.6°C 11°C - 78% 0.51kPa
14:00
3.2°C 7°C 11°C - 71% 0.55kPa
15:00
3.4°C 7.2°C 11°C - 40% 0.57kPa
16:00
3.5°C 7.6°C 11°C - 96% 0.56kPa
17:00
3.5°C 7.8°C 11°C - 86% 0.51kPa
18:00
3.7°C 7.9°C 10°C - 45% 0.43kPa
19:00
4°C 8°C 8.9°C - 10% 0.32kPa
20:00
3.3°C 7.2°C 6.6°C - 9% 0.2kPa
21:00
2.4°C 6.5°C 4.3°C - 8% 0.1kPa
22:00
1.4°C 5.8°C 2°C - 7% 0.03kPa
23:00
1.6°C 5.5°C 2.2°C - 5% 0.03kPa
Thu, Apr 23 Sunrise 05:55 Sunset 20:39
24:00
1.7°C 5.3°C 2.5°C - 2% 0.04kPa
01:00
1.9°C 5°C 2.8°C - 0% 0.04kPa
02:00
2.8°C 5.2°C 5.1°C - 1% 0.13kPa
03:00
3.4°C 5.3°C 7.4°C - 3% 0.25kPa
04:00
3.9°C 5.5°C 9.7°C - 4% 0.4kPa
05:00
3.8°C 6°C 11°C - 5% 0.52kPa
06:00
3.7°C 6.5°C 13°C - 5% 0.67kPa
07:00
3.3°C 7.1°C 14°C - 5% 0.83kPa
08:00
3.4°C 7.5°C 15°C - 5% 0.88kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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