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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 99% failing
Time Window 83% failing

Currently

Real-time conditions
Soil Temperature15.2°C
Dew Point13.8°C (moderate dew point)
Wind Speed6.8m/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 79 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, Jul 8
06:000%2.5m/s
07:000%3.2m/s
08:000%4m/s
09:000%5.1m/s
10:000%5.5m/s
11:000%5.8m/s
12:000%6.1m/s
13:000%6.1m/s
14:000%6.5m/s
15:000%6.8m/s
16:000%6.9m/s
17:000%6.9m/s
18:000%6.7m/s
19:000%6.6m/s
20:000%6m/s
21:000%5.8m/s
22:000%5.4m/s
23:000%4.9m/s
Thu, Jul 9
24:000%5.2m/s
01:000%5.4m/s
02:000%5.7m/s
03:000%5.5m/s
04:000%5.8m/s
05:000%5.7m/s
06:000%5.8m/s
07:000%5.8m/s
08:000%5.6m/s
09:000%5.3m/s
10:000%5.3m/s
11:000%5.1m/s
12:000%5m/s
13:000%4.8m/s
14:000%4.6m/s
15:000%4.3m/s
16:000%4.2m/s
17:000%4m/s
18:000%3.6m/s
19:000%3.3m/s
20:000%3m/s
21:000%2.2m/s
22:000%1.8m/s
23:000%1.3m/s
Fri, Jul 10
24:000%2.2m/s
01:000%2.4m/s
02:000%2.5m/s
03:000%2.2m/s
04:000%2.4m/s
05:000%2.6m/s
06:000%2.4m/s
07:000%1.9m/s
08:000%2m/s
09:000%2.6m/s
10:000%2.1m/s
11:000%2.6m/s
12:000%2.4m/s
13:000%2.8m/s
14:000%3.1m/s
15:000%3.2m/s
16:000%4.2m/s
17:000%4.3m/s
18:000%4.4m/s
19:000%4.1m/s
20:000%3.5m/s
21:000%2.8m/s
22:000%2.1m/s
23:000%2.1m/s
Sat, Jul 11
24:000%2.1m/s
01:000%2.1m/s
02:000%2.2m/s
03:000%2.3m/s
04:000%2.4m/s
05:000%2.8m/s
06:000%3.1m/s
07:000%3.5m/s
08:000%3.6m/s
09:000%3.8m/s
10:000%3.9m/s
11:000%4m/s
12:000%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
Wed, Jul 8 Sunrise 04:34 Sunset 22:26
15:00
14°C 15°C 18°C - 28% 0.51kPa
16:00
14°C 15°C 18°C - 24% 0.48kPa
17:00
13°C 16°C 17°C - 35% 0.43kPa
18:00
13°C 16°C 17°C - 33% 0.4kPa
19:00
13°C 16°C 16°C - 40% 0.34kPa
20:00
13°C 16°C 16°C - 41% 0.29kPa
21:00
12°C 16°C 15°C - 24% 0.26kPa
22:00
12°C 16°C 14°C - 20% 0.14kPa
23:00
12°C 15°C 13°C - 32% 0.07kPa
Thu, Jul 9 Sunrise 04:34 Sunset 22:26
24:00
13°C 15°C 13°C - 47% 0.08kPa
01:00
13°C 15°C 13°C - 32% 0.08kPa
02:00
13°C 15°C 13°C - 55% 0.07kPa
03:00
13°C 15°C 14°C - 52% 0.08kPa
04:00
13°C 15°C 14°C - 57% 0.07kPa
05:00
13°C 14°C 14°C - 70% 0.08kPa
06:00
14°C 14°C 15°C - 79% 0.11kPa
07:00
14°C 14°C 15°C - 86% 0.13kPa
08:00
14°C 14°C 15°C - 100% 0.14kPa
09:00
14°C 14°C 15°C - 100% 0.12kPa
10:00
14°C 14°C 15°C - 100% 0.11kPa
11:00
14°C 14°C 15°C - 100% 0.11kPa
12:00
14°C 14°C 15°C - 100% 0.09kPa
13:00
14°C 14°C 15°C - 100% 0.1kPa
14:00
14°C 14°C 15°C - 100% 0.11kPa
15:00
14°C 15°C 15°C - 100% 0.11kPa
16:00
14°C 15°C 15°C - 100% 0.1kPa
17:00
14°C 15°C 15°C - 100% 0.11kPa
18:00
14°C 15°C 15°C - 100% 0.12kPa
19:00
14°C 15°C 15°C - 100% 0.11kPa
20:00
14°C 15°C 15°C - 100% 0.1kPa
21:00
14°C 15°C 14°C - 100% 0.08kPa
22:00
13°C 15°C 14°C - 100% 0.06kPa
23:00
13°C 15°C 14°C - 99% 0.06kPa
Fri, Jul 10 Sunrise 04:35 Sunset 22:25
24:00
13°C 14°C 14°C - 100% 0.06kPa
01:00
12°C 14°C 13°C - 100% 0.09kPa
02:00
12°C 14°C 13°C - 100% 0.1kPa
03:00
11°C 14°C 12°C - 100% 0.12kPa
04:00
10°C 14°C 12°C - 100% 0.13kPa
05:00
9.5°C 14°C 11°C - 100% 0.15kPa
06:00
9.1°C 13°C 12°C - 100% 0.22kPa
07:00
9.4°C 13°C 12°C - 100% 0.18kPa
08:00
9.2°C 13°C 11°C - 100% 0.17kPa
09:00
9.5°C 13°C 12°C - 100% 0.24kPa
10:00
9.6°C 13°C 12°C - 100% 0.18kPa
11:00
9.7°C 13°C 12°C - 100% 0.19kPa
12:00
9.7°C 13°C 14°C - 100% 0.4kPa
13:00
9.7°C 13°C 15°C - 100% 0.55kPa
14:00
9.4°C 14°C 16°C - 100% 0.62kPa
15:00
9°C 14°C 16°C - 21% 0.65kPa
16:00
8.8°C 14°C 16°C - 27% 0.64kPa
17:00
8.9°C 14°C 15°C - 9% 0.58kPa
18:00
9.1°C 14°C 15°C - 13% 0.5kPa
19:00
9.2°C 14°C 14°C - 10% 0.44kPa
20:00
8.7°C 3252°C 12°C - 7% 0.31kPa
21:00
8.2°C 6489°C 11°C - 3% 0.19kPa
22:00
7.6°C 9726°C 8.9°C - 0% 0.1kPa
23:00
7.9°C 9726°C 9.5°C - 0% 0.12kPa
Sat, Jul 11 Sunrise 04:37 Sunset 22:23
24:00
8.3°C 9726°C 10°C - 0% 0.14kPa
01:00
8.7°C 9726°C 11°C - 0% 0.16kPa
02:00
8.7°C 9726°C 12°C - 0% 0.24kPa
03:00
8.7°C 9726°C 13°C - 0% 0.34kPa
04:00
8.6°C 9726°C 14°C - 0% 0.44kPa
05:00
8.7°C 9726°C 14°C - 4% 0.46kPa
06:00
8.8°C 9726°C 14°C - 8% 0.48kPa
07:00
8.9°C 9726°C 14°C - 12% 0.5kPa
08:00
8.9°C 9726°C 14°C - 23% 0.5kPa
09:00
8.9°C 9726°C 14°C - 35% 0.5kPa
10:00
8.9°C 9726°C 14°C - 46% 0.5kPa
11:00
8.9°C 9726°C 14°C - 37% 0.49kPa
12:00
8.9°C 9726°C 14°C - 28% 0.49kPa
13:00
8.9°C 9726°C 14°C - 18% 0.48kPa
14:00
8.7°C 9726°C 13°C - 23% 0.4kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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