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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
Time Window 88% failing
Wind Speed 75% failing

Currently

Real-time conditions
Soil Temperature12.4°C
Dew Point10.9°C (moderate dew point)
Wind Speed5.3m/s (moderate winds)
Cloud Cover28%

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, May 23
14:000%5.2m/s
15:000%5.2m/s
16:000%4.9m/s
17:000%4.5m/s
18:000%4.4m/s
19:000%3.8m/s
20:000%3.4m/s
21:000%2.4m/s
22:000%2m/s
23:000%1.5m/s
Sun, May 24
24:000%1.3m/s
01:000%1.4m/s
02:000%1.6m/s
03:000%1.6m/s
04:000%1.4m/s
05:000%1.3m/s
06:000%1.3m/s
07:000%1.3m/s
08:000%1.7m/s
09:000%2.1m/s
10:000%2.6m/s
11:000%3.8m/s
12:000%4.9m/s
13:000%5.1m/s
14:000%5.3m/s
15:000%5.5m/s
16:000%5.1m/s
17:000%5.1m/s
18:000%4.9m/s
19:000%4.1m/s
20:000%2.6m/s
21:000%1.6m/s
22:000%1.5m/s
23:000%1.5m/s
Mon, May 25
24:000%1.3m/s
01:000%1.2m/s
02:000%1.2m/s
03:000%1.2m/s
04:000%1.1m/s
05:000%1.1m/s
06:000%1.2m/s
07:000%1.3m/s
08:000%1.7m/s
09:000%2.3m/s
10:000%3.6m/s
11:000%4.5m/s
12:000%5.2m/s
13:000%5.4m/s
14:000%5.6m/s
15:000%5.6m/s
16:000%5.4m/s
17:000%5.1m/s
18:000%4.4m/s
19:000%3.6m/s
20:000%3m/s
21:000%2m/s
22:000%1.7m/s
23:000%1.6m/s
Tue, May 26
24:000%1.6m/s
01:000%1.8m/s
02:000%1.7m/s
03:000%1.8m/s
04:000%1.7m/s
05:000%1.7m/s
06:000%1.7m/s
07:000%1.5m/s
08:000%1.1m/s
09:000%1.2m/s
10:000%1.3m/s
11:000%1.3m/s
12:000%1.1m/s
13:000%1m/s
14:000%1.3m/s
15:000%1.6m/s
16:000%1.6m/s
17:000%1.8m/s
18:000%1.5m/s
19:000%1.9m/s
20:000%1.9m/s
21:000%1.9m/s
22:000%1.9m/s
23:000%1.8m/s
Wed, May 27
24:000%1.8m/s
01:000%1.8m/s
02:000%2m/s
03:000%2.1m/s
04:000%2.3m/s
05:000%2.6m/s
06:000%2.8m/s
07:000%3m/s
08:000%3.2m/s
09:000%3.4m/s
10:000%3.5m/s
11:000%3.3m/s
12:000%3.2m/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, May 24 Sunrise 04:51 Sunset 21:40
14:00
11°C 12°C 18°C - 28% 0.74kPa
15:00
11°C 13°C 18°C - 16% 0.76kPa
16:00
11°C 13°C 18°C - 5% 0.76kPa
17:00
11°C 13°C 18°C - 7% 0.74kPa
18:00
12°C 13°C 18°C - 6% 0.65kPa
19:00
12°C 13°C 17°C - 5% 0.5kPa
20:00
12°C 13°C 16°C - 5% 0.37kPa
21:00
11°C 13°C 13°C - 1% 0.22kPa
22:00
9.9°C 13°C 11°C - 2% 0.13kPa
23:00
9.4°C 13°C 11°C - 5% 0.11kPa
Mon, May 25 Sunrise 04:51 Sunset 21:40
24:00
9°C 13°C 10°C - 5% 0.1kPa
01:00
8.7°C 13°C 9.7°C - 5% 0.08kPa
02:00
8.4°C 12°C 9.4°C - 5% 0.07kPa
03:00
8.2°C 12°C 9°C - 5% 0.06kPa
04:00
8°C 12°C 8.7°C - 4% 0.06kPa
05:00
7.8°C 12°C 8.5°C - 5% 0.05kPa
06:00
8.6°C 11°C 9.4°C - 5% 0.06kPa
07:00
9.7°C 11°C 11°C - 5% 0.15kPa
08:00
10°C 11°C 13°C - 24% 0.27kPa
09:00
11°C 12°C 15°C - 5% 0.48kPa
10:00
11°C 12°C 17°C - 21% 0.66kPa
11:00
11°C 12°C 18°C - 5% 0.79kPa
12:00
11°C 12°C 19°C - 5% 0.91kPa
13:00
11°C 13°C 19°C - 5% 0.98kPa
14:00
11°C 13°C 20°C - 5% 1kPa
15:00
11°C 13°C 20°C - 5% 1kPa
16:00
11°C 13°C 20°C - 5% 0.97kPa
17:00
11°C 13°C 19°C - 6% 0.91kPa
18:00
12°C 14°C 19°C - 5% 0.77kPa
19:00
13°C 14°C 18°C - 5% 0.61kPa
20:00
13°C 14°C 17°C - 5% 0.43kPa
21:00
12°C 14°C 15°C - 5% 0.22kPa
22:00
11°C 14°C 13°C - 5% 0.12kPa
23:00
11°C 14°C 12°C - 5% 0.1kPa
Tue, May 26 Sunrise 04:49 Sunset 21:42
24:00
11°C 13°C 11°C - 5% 0.08kPa
01:00
10°C 13°C 11°C - 5% 0.07kPa
02:00
9.8°C 13°C 11°C - 5% 0.06kPa
03:00
9.3°C 13°C 10°C - 5% 0.06kPa
04:00
8.7°C 13°C 9.6°C - 5% 0.07kPa
05:00
8.2°C 12°C 9.3°C - 5% 0.08kPa
06:00
8.5°C 12°C 10°C - 5% 0.13kPa
07:00
9.2°C 12°C 12°C - 5% 0.25kPa
08:00
9.2°C 12°C 14°C - 11% 0.45kPa
09:00
9.1°C 12°C 16°C - 18% 0.69kPa
10:00
9.2°C 13°C 18°C - 13% 0.88kPa
11:00
9.6°C 13°C 19°C - 10% 1kPa
12:00
10°C 13°C 21°C - 5% 1.2kPa
13:00
10°C 13°C 22°C - 5% 1.3kPa
14:00
11°C 14°C 22°C - 5% 1.4kPa
15:00
11°C 14°C 22°C - 6% 1.4kPa
16:00
11°C 14°C 22°C - 5% 1.4kPa
17:00
11°C 15°C 22°C - 23% 1.3kPa
18:00
12°C 15°C 22°C - 98% 1.1kPa
19:00
14°C 15°C 20°C - 8% 0.73kPa
20:00
11°C 14°C 16°C - 39% 0.45kPa
21:00
8.5°C 14°C 12°C - 69% 0.26kPa
22:00
5.6°C 13°C 7.6°C - 100% 0.13kPa
23:00
5.7°C 13°C 8.3°C - 73% 0.18kPa
Wed, May 27 Sunrise 04:48 Sunset 21:43
24:00
5.9°C 13°C 9.1°C - 46% 0.23kPa
01:00
6°C 12°C 9.9°C - 18% 0.28kPa
02:00
6.9°C 12°C 11°C - 22% 0.35kPa
03:00
7.7°C 12°C 13°C - 26% 0.43kPa
04:00
8.5°C 12°C 14°C - 29% 0.52kPa
05:00
9.4°C 13°C 16°C - 36% 0.59kPa
06:00
10°C 13°C 17°C - 43% 0.66kPa
07:00
11°C 13°C 18°C - 50% 0.73kPa
08:00
12°C 13°C 19°C - 48% 0.77kPa
09:00
12°C 13°C 19°C - 47% 0.8kPa
10:00
13°C 14°C 20°C - 46% 0.83kPa
11:00
13°C 14°C 19°C - 46% 0.74kPa
12:00
13°C 14°C 19°C - 46% 0.65kPa
13:00
13°C 14°C 18°C - 46% 0.57kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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