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Rule Morning Frost

Isle of Skye - Morning Frost - Scotland

Portree, 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 88% failing
Time Window 83% failing

Currently

Real-time conditions
Soil Temperature12.9°C
Dew Point12.3°C (moderate dew point)
Wind Speed5.3m/s (moderate winds)
Cloud Cover86%

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 80 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%2.9m/s
07:000%2.9m/s
08:000%3.1m/s
09:000%3.1m/s
10:000%3.4m/s
11:000%4.1m/s
12:000%4.2m/s
13:000%4.6m/s
14:000%5m/s
15:000%5.3m/s
16:000%5.2m/s
17:000%5.1m/s
18:000%5.1m/s
19:000%4.4m/s
20:000%4.5m/s
21:000%4.3m/s
22:000%4.3m/s
23:000%4.2m/s
Thu, Jul 9
24:000%4.2m/s
01:000%4.1m/s
02:000%4.4m/s
03:000%4.3m/s
04:000%4.4m/s
05:000%4.4m/s
06:000%4.2m/s
07:000%4.5m/s
08:000%4.7m/s
09:000%4.7m/s
10:000%5m/s
11:000%4.8m/s
12:000%4.6m/s
13:000%4.2m/s
14:000%4.1m/s
15:000%4.1m/s
16:000%4.1m/s
17:000%4m/s
18:000%3.8m/s
19:000%3.5m/s
20:000%3m/s
21:000%3m/s
22:000%2.8m/s
23:000%2.6m/s
Fri, Jul 10
24:000%2.3m/s
01:000%1.7m/s
02:000%1.6m/s
03:000%1.5m/s
04:000%0.62m/s
05:000%1.8m/s
06:000%1.8m/s
07:000%2m/s
08:000%2.3m/s
09:000%1.1m/s
10:000%0.4m/s
11:000%0.85m/s
12:000%0.71m/s
13:000%1.3m/s
14:000%0.81m/s
15:000%0.77m/s
16:000%1.3m/s
17:000%1.8m/s
18:000%2m/s
19:000%2m/s
20:000%3m/s
21:000%4m/s
22:000%5m/s
23:000%4.9m/s
Sat, Jul 11
24:000%4.8m/s
01:000%4.7m/s
02:000%4.9m/s
03:000%5.1m/s
04:000%5.2m/s
05:000%5.1m/s
06:000%4.9m/s
07:000%4.8m/s
08:000%4.9m/s
09:000%5m/s
10:000%5m/s
11:000%5.3m/s
12:000%5.5m/s
13:000%5.7m/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 04:40 Sunset 22:18
15:00
12°C 13°C 15°C - 86% 0.29kPa
16:00
12°C 13°C 16°C - 90% 0.35kPa
17:00
13°C 13°C 15°C - 100% 0.29kPa
18:00
12°C 13°C 15°C - 100% 0.27kPa
19:00
12°C 13°C 14°C - 99% 0.21kPa
20:00
12°C 13°C 15°C - 96% 0.23kPa
21:00
12°C 13°C 14°C - 84% 0.25kPa
22:00
12°C 13°C 14°C - 52% 0.14kPa
23:00
12°C 13°C 12°C - 39% 0.06kPa
Thu, Jul 9 Sunrise 04:40 Sunset 22:18
24:00
12°C 13°C 12°C - 45% 0.04kPa
01:00
12°C 13°C 13°C - 52% 0.05kPa
02:00
12°C 13°C 13°C - 46% 0.07kPa
03:00
12°C 13°C 13°C - 64% 0.08kPa
04:00
12°C 13°C 13°C - 87% 0.09kPa
05:00
13°C 13°C 14°C - 96% 0.1kPa
06:00
13°C 13°C 14°C - 99% 0.08kPa
07:00
13°C 13°C 14°C - 95% 0.08kPa
08:00
13°C 13°C 15°C - 99% 0.12kPa
09:00
13°C 13°C 15°C - 100% 0.17kPa
10:00
13°C 13°C 15°C - 100% 0.18kPa
11:00
13°C 13°C 14°C - 100% 0.1kPa
12:00
14°C 13°C 15°C - 100% 0.08kPa
13:00
14°C 13°C 14°C - 100% 0.06kPa
14:00
14°C 13°C 14°C - 100% 0.05kPa
15:00
14°C 13°C 14°C - 100% 0.05kPa
16:00
14°C 13°C 15°C - 100% 0.06kPa
17:00
14°C 13°C 14°C - 100% 0.05kPa
18:00
14°C 13°C 14°C - 100% 0.04kPa
19:00
14°C 13°C 14°C - 100% 0.03kPa
20:00
14°C 13°C 14°C - 100% 0.02kPa
21:00
13°C 13°C 14°C - 100% 0.02kPa
22:00
13°C 13°C 14°C - 100% 0.02kPa
23:00
13°C 13°C 13°C - 100% 0.01kPa
Fri, Jul 10 Sunrise 04:41 Sunset 22:17
24:00
13°C 13°C 13°C - 100% 0.01kPa
01:00
13°C 13°C 13°C - 100% 0.01kPa
02:00
13°C 13°C 13°C - 100% 0.01kPa
03:00
13°C 13°C 13°C - 100% 0.01kPa
04:00
13°C 13°C 13°C - 100% 0.01kPa
05:00
13°C 13°C 13°C - 100% 0.01kPa
06:00
12°C 13°C 12°C - 100% 0.02kPa
07:00
11°C 13°C 11°C - 100% 0.03kPa
08:00
9.7°C 13°C 10°C - 100% 0.03kPa
09:00
9.3°C 13°C 9.8°C - 100% 0.04kPa
10:00
9.5°C 12°C 10°C - 100% 0.05kPa
11:00
9.8°C 12°C 11°C - 100% 0.07kPa
12:00
10°C 12°C 11°C - 100% 0.11kPa
13:00
9.8°C 12°C 12°C - 100% 0.16kPa
14:00
9.7°C 12°C 12°C - 100% 0.17kPa
15:00
9.8°C 12°C 12°C - 90% 0.15kPa
16:00
9.6°C 12°C 15°C - 83% 0.5kPa
17:00
8.8°C 13°C 15°C - 99% 0.6kPa
18:00
8.5°C 13°C 15°C - 98% 0.57kPa
19:00
8.3°C 13°C 14°C - 22% 0.49kPa
20:00
8.9°C 3250°C 13°C - 16% 0.35kPa
21:00
9.4°C 6488°C 12°C - 10% 0.23kPa
22:00
9.7°C 9726°C 11°C - 4% 0.12kPa
23:00
9.7°C 9726°C 11°C - 3% 0.13kPa
Sat, Jul 11 Sunrise 04:42 Sunset 22:16
24:00
9.8°C 9726°C 11°C - 2% 0.13kPa
01:00
9.8°C 9726°C 11°C - 0% 0.14kPa
02:00
9.8°C 9726°C 12°C - 0% 0.16kPa
03:00
9.7°C 9726°C 12°C - 0% 0.18kPa
04:00
9.7°C 9726°C 12°C - 0% 0.2kPa
05:00
9.6°C 9726°C 12°C - 0% 0.23kPa
06:00
9.5°C 9726°C 12°C - 0% 0.25kPa
07:00
9.4°C 9726°C 13°C - 0% 0.27kPa
08:00
9.2°C 9726°C 13°C - 2% 0.29kPa
09:00
9.1°C 9726°C 13°C - 3% 0.3kPa
10:00
8.9°C 9726°C 13°C - 5% 0.32kPa
11:00
9.1°C 9726°C 13°C - 5% 0.31kPa
12:00
9.2°C 9726°C 13°C - 5% 0.3kPa
13:00
9.3°C 9726°C 13°C - 5% 0.29kPa
14:00
9.3°C 9726°C 12°C - 7% 0.27kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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