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Rule Morning Frost

Shetland Islands - Morning Frost - Scotland

Lerwick, 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 100% failing
Time Window 88% failing

Currently

Real-time conditions
Soil Temperature14.1°C
Dew Point12.5°C (moderate dew point)
Wind Speed5.4m/s (moderate winds)
Cloud Cover100%

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%3.3m/s
07:000%3.6m/s
08:000%4.5m/s
09:000%5.3m/s
10:000%5.8m/s
11:000%5.9m/s
12:000%5.4m/s
13:000%5.3m/s
14:000%5.9m/s
15:000%5.4m/s
16:000%5.2m/s
17:000%5.4m/s
18:000%6m/s
19:000%6.6m/s
20:000%5.7m/s
21:000%5.4m/s
22:000%4.4m/s
23:000%4m/s
Thu, Jul 9
24:000%3.9m/s
01:000%4.3m/s
02:000%4.9m/s
03:000%5.4m/s
04:000%5.8m/s
05:000%5.8m/s
06:000%5m/s
07:000%5.4m/s
08:000%5.3m/s
09:000%5.1m/s
10:000%4.8m/s
11:000%5.3m/s
12:000%5.4m/s
13:000%5.8m/s
14:000%6.2m/s
15:000%6m/s
16:000%6m/s
17:000%5.5m/s
18:000%5m/s
19:000%4.4m/s
20:000%3.5m/s
21:000%3.6m/s
22:000%3.8m/s
23:000%4.2m/s
Fri, Jul 10
24:000%4.3m/s
01:000%4m/s
02:000%3.7m/s
03:000%3.5m/s
04:000%3.1m/s
05:000%2.5m/s
06:000%2.7m/s
07:000%2.9m/s
08:000%2.8m/s
09:000%3m/s
10:000%2.7m/s
11:000%2.4m/s
12:000%3.9m/s
13:000%4.9m/s
14:000%2.8m/s
15:000%3.2m/s
16:000%4.3m/s
17:000%3.3m/s
18:000%4.2m/s
19:000%4.4m/s
20:000%4.2m/s
21:000%4m/s
22:000%3.7m/s
23:000%3.5m/s
Sat, Jul 11
24:000%3.3m/s
01:000%3.1m/s
02:000%3.1m/s
03:000%3.1m/s
04:000%3.1m/s
05:000%3.2m/s
06:000%3.3m/s
07:000%3.4m/s
08:000%3.5m/s
09:000%3.6m/s
10:000%3.7m/s
11:000%3.7m/s
12:000%3.6m/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 03:54 Sunset 22:23
15:00
13°C 14°C 14°C - 100% 0.17kPa
16:00
13°C 14°C 14°C - 100% 0.08kPa
17:00
13°C 14°C 13°C - 98% 0.07kPa
18:00
13°C 14°C 14°C - 37% 0.15kPa
19:00
12°C 14°C 15°C - 30% 0.23kPa
20:00
12°C 14°C 14°C - 48% 0.19kPa
21:00
12°C 14°C 14°C - 21% 0.16kPa
22:00
12°C 14°C 13°C - 22% 0.05kPa
23:00
12°C 14°C 13°C - 24% 0.05kPa
Thu, Jul 9 Sunrise 03:54 Sunset 22:23
24:00
12°C 14°C 12°C - 30% 0.05kPa
01:00
12°C 13°C 12°C - 46% 0.04kPa
02:00
12°C 13°C 12°C - 39% 0.05kPa
03:00
12°C 13°C 12°C - 6% 0.08kPa
04:00
12°C 13°C 13°C - 2% 0.11kPa
05:00
12°C 13°C 13°C - 17% 0.13kPa
06:00
12°C 13°C 13°C - 82% 0.11kPa
07:00
13°C 13°C 14°C - 100% 0.12kPa
08:00
13°C 13°C 14°C - 100% 0.13kPa
09:00
13°C 13°C 14°C - 100% 0.14kPa
10:00
13°C 13°C 14°C - 100% 0.12kPa
11:00
13°C 13°C 15°C - 100% 0.21kPa
12:00
13°C 14°C 15°C - 100% 0.22kPa
13:00
13°C 14°C 15°C - 100% 0.24kPa
14:00
13°C 14°C 15°C - 100% 0.23kPa
15:00
13°C 14°C 15°C - 100% 0.19kPa
16:00
13°C 14°C 14°C - 100% 0.15kPa
17:00
13°C 14°C 14°C - 100% 0.13kPa
18:00
13°C 14°C 14°C - 100% 0.1kPa
19:00
13°C 14°C 14°C - 100% 0.09kPa
20:00
13°C 14°C 14°C - 100% 0.09kPa
21:00
13°C 14°C 14°C - 98% 0.09kPa
22:00
13°C 14°C 14°C - 100% 0.06kPa
23:00
13°C 14°C 14°C - 100% 0.05kPa
Fri, Jul 10 Sunrise 03:56 Sunset 22:22
24:00
13°C 14°C 13°C - 100% 0.05kPa
01:00
13°C 14°C 13°C - 100% 0.05kPa
02:00
13°C 14°C 13°C - 100% 0.05kPa
03:00
13°C 14°C 13°C - 100% 0.04kPa
04:00
13°C 14°C 13°C - 100% 0.04kPa
05:00
13°C 14°C 13°C - 100% 0.05kPa
06:00
13°C 14°C 13°C - 100% 0.05kPa
07:00
13°C 14°C 13°C - 100% 0.05kPa
08:00
13°C 13°C 13°C - 100% 0.05kPa
09:00
12°C 13°C 13°C - 100% 0.06kPa
10:00
12°C 13°C 13°C - 100% 0.1kPa
11:00
12°C 13°C 13°C - 100% 0.13kPa
12:00
11°C 13°C 12°C - 100% 0.15kPa
13:00
9.9°C 13°C 11°C - 100% 0.14kPa
14:00
9.3°C 13°C 11°C - 100% 0.12kPa
15:00
9.1°C 13°C 11°C - 100% 0.16kPa
16:00
9.3°C 13°C 13°C - 100% 0.32kPa
17:00
10°C 13°C 11°C - 100% 0.13kPa
18:00
10°C 13°C 12°C - 100% 0.19kPa
19:00
10°C 13°C 13°C - 88% 0.23kPa
20:00
10°C 3251°C 12°C - 59% 0.2kPa
21:00
10°C 6488°C 12°C - 29% 0.17kPa
22:00
10°C 9726°C 12°C - 0% 0.15kPa
23:00
9.9°C 9726°C 12°C - 0% 0.16kPa
Sat, Jul 11 Sunrise 03:58 Sunset 22:20
24:00
9.8°C 9726°C 12°C - 0% 0.17kPa
01:00
9.7°C 9726°C 12°C - 0% 0.18kPa
02:00
9.7°C 9726°C 12°C - 2% 0.19kPa
03:00
9.7°C 9726°C 12°C - 3% 0.21kPa
04:00
9.7°C 9726°C 12°C - 5% 0.23kPa
05:00
9.6°C 9726°C 13°C - 4% 0.26kPa
06:00
9.6°C 9726°C 13°C - 4% 0.28kPa
07:00
9.5°C 9726°C 13°C - 3% 0.3kPa
08:00
9.4°C 9726°C 13°C - 3% 0.32kPa
09:00
9.4°C 9726°C 13°C - 2% 0.33kPa
10:00
9.4°C 9726°C 13°C - 2% 0.34kPa
11:00
9.3°C 9726°C 13°C - 15% 0.35kPa
12:00
9.3°C 9726°C 13°C - 28% 0.37kPa
13:00
9.2°C 9726°C 13°C - 41% 0.38kPa
14:00
9.1°C 9726°C 13°C - 60% 0.36kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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