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Rule Morning Frost

Glencoe - Morning Frost - Scotland

Fort William, 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 85% failing
Time Window 83% failing

Currently

Real-time conditions
Soil Temperature12.8°C
Dew Point13.0°C (moderate dew point)
Wind Speed2.6m/s (calm conditions)
Cloud Cover0%

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
05:000%2.2m/s
06:000%2.1m/s
07:000%2.1m/s
08:000%2.3m/s
09:000%1.9m/s
10:000%2.1m/s
11:000%2.1m/s
12:000%2.4m/s
13:000%2.5m/s
14:000%2.6m/s
15:000%2.6m/s
16:000%2.7m/s
17:000%2.5m/s
18:000%2.4m/s
19:000%2.8m/s
20:000%2.4m/s
21:000%2.3m/s
22:000%2.3m/s
23:000%2.2m/s
Thu, Jul 9
24:000%2.3m/s
01:000%2.2m/s
02:000%2.1m/s
03:000%2.1m/s
04:000%2.1m/s
05:000%1.9m/s
06:000%1.8m/s
07:000%1.7m/s
08:000%1.8m/s
09:000%2.1m/s
10:000%2.5m/s
11:000%2.9m/s
12:000%2.9m/s
13:000%3m/s
14:000%3.2m/s
15:000%3.3m/s
16:000%3.2m/s
17:000%3m/s
18:000%2.6m/s
19:000%2.7m/s
20:000%2.3m/s
21:000%2m/s
22:000%1.8m/s
23:000%1.6m/s
Fri, Jul 10
24:000%1.4m/s
01:000%1.5m/s
02:000%1.5m/s
03:000%1.4m/s
04:000%1.4m/s
05:000%1.4m/s
06:000%1.2m/s
07:000%1.1m/s
08:000%1.5m/s
09:000%1.9m/s
10:000%2m/s
11:000%2.3m/s
12:000%1.6m/s
13:000%2m/s
14:000%2.3m/s
15:000%2.2m/s
16:000%1.8m/s
17:000%1.8m/s
18:000%1.9m/s
19:000%2m/s
20:000%1.9m/s
21:000%1.8m/s
22:000%1.6m/s
23:000%1.8m/s
Sat, Jul 11
24:000%1.9m/s
01:000%2m/s
02:000%2.1m/s
03:000%2.1m/s
04:000%2.2m/s
05:000%2.1m/s
06:000%2m/s
07:000%1.8m/s
08:000%1.7m/s
09:000%1.6m/s
10:000%1.5m/s
11:000%1.4m/s
12:000%1.4m/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 04:40 Sunset 22:09
15:00
13°C 13°C 19°C - 0% 0.63kPa
16:00
13°C 13°C 19°C - 0% 0.72kPa
17:00
13°C 13°C 19°C - 0% 0.72kPa
18:00
13°C 13°C 19°C - 3% 0.68kPa
19:00
13°C 14°C 18°C - 5% 0.56kPa
20:00
13°C 14°C 17°C - 18% 0.36kPa
21:00
13°C 14°C 14°C - 75% 0.18kPa
22:00
12°C 14°C 12°C - 0% 0.07kPa
23:00
11°C 14°C 11°C - 6% 0.05kPa
Thu, Jul 9 Sunrise 04:40 Sunset 22:09
24:00
10°C 13°C 11°C - 8% 0.04kPa
01:00
10°C 13°C 11°C - 8% 0.03kPa
02:00
10°C 13°C 10°C - 6% 0.03kPa
03:00
9.9°C 13°C 10°C - 4% 0.04kPa
04:00
9.8°C 13°C 10°C - 6% 0.04kPa
05:00
9.6°C 13°C 10°C - 6% 0.04kPa
06:00
10°C 13°C 11°C - 23% 0.05kPa
07:00
12°C 13°C 13°C - 37% 0.11kPa
08:00
13°C 13°C 14°C - 66% 0.16kPa
09:00
13°C 13°C 15°C - 47% 0.24kPa
10:00
14°C 13°C 17°C - 61% 0.38kPa
11:00
13°C 13°C 18°C - 100% 0.47kPa
12:00
13°C 13°C 18°C - 100% 0.49kPa
13:00
14°C 13°C 19°C - 89% 0.56kPa
14:00
14°C 14°C 19°C - 81% 0.58kPa
15:00
14°C 14°C 18°C - 92% 0.51kPa
16:00
14°C 14°C 18°C - 99% 0.46kPa
17:00
14°C 14°C 18°C - 99% 0.42kPa
18:00
14°C 14°C 17°C - 99% 0.4kPa
19:00
14°C 14°C 17°C - 100% 0.36kPa
20:00
14°C 14°C 16°C - 100% 0.27kPa
21:00
14°C 14°C 15°C - 100% 0.15kPa
22:00
13°C 14°C 14°C - 100% 0.09kPa
23:00
13°C 14°C 13°C - 13% 0.05kPa
Fri, Jul 10 Sunrise 04:41 Sunset 22:08
24:00
12°C 14°C 12°C - 2% 0.05kPa
01:00
12°C 14°C 12°C - 100% 0.04kPa
02:00
11°C 14°C 12°C - 100% 0.04kPa
03:00
11°C 14°C 12°C - 86% 0.04kPa
04:00
11°C 14°C 11°C - 63% 0.03kPa
05:00
11°C 13°C 12°C - 100% 0.04kPa
06:00
12°C 13°C 12°C - 87% 0.04kPa
07:00
13°C 13°C 14°C - 67% 0.11kPa
08:00
14°C 13°C 15°C - 85% 0.2kPa
09:00
14°C 14°C 17°C - 100% 0.3kPa
10:00
14°C 14°C 18°C - 99% 0.43kPa
11:00
14°C 14°C 18°C - 84% 0.54kPa
12:00
14°C 14°C 19°C - 97% 0.56kPa
13:00
14°C 14°C 19°C - 100% 0.52kPa
14:00
15°C 14°C 17°C - 100% 0.31kPa
15:00
15°C 14°C 18°C - 100% 0.39kPa
16:00
14°C 15°C 18°C - 100% 0.38kPa
17:00
14°C 15°C 17°C - 100% 0.34kPa
18:00
14°C 15°C 17°C - 100% 0.3kPa
19:00
14°C 15°C 16°C - 100% 0.27kPa
20:00
13°C 14°C 15°C - 100% 0.18kPa
21:00
12°C 14°C 13°C - 99% 0.11kPa
22:00
11°C 14°C 11°C - 99% 0.05kPa
23:00
11°C 14°C 11°C - 99% 0.07kPa
Sat, Jul 11 Sunrise 04:42 Sunset 22:07
24:00
10°C 14°C 11°C - 100% 0.09kPa
01:00
10°C 14°C 12°C - 100% 0.11kPa
02:00
10°C 14°C 12°C - 91% 0.19kPa
03:00
10°C 14°C 13°C - 82% 0.26kPa
04:00
10°C 14°C 14°C - 74% 0.35kPa
05:00
10°C 14°C 15°C - 82% 0.4kPa
06:00
10°C 14°C 15°C - 91% 0.46kPa
07:00
10°C 14°C 16°C - 100% 0.51kPa
08:00
10°C 14°C 16°C - 89% 0.54kPa
09:00
10°C 14°C 16°C - 78% 0.58kPa
10:00
10°C 14°C 16°C - 67% 0.61kPa
11:00
10°C 14°C 17°C - 52% 0.66kPa
12:00
10°C 14°C 17°C - 36% 0.7kPa
13:00
10°C 14°C 18°C - 21% 0.76kPa
14:00
11°C 14°C 16°C - 37% 0.58kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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