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Rule Morning Frost

Orkney Islands - Morning Frost - Scotland

Kirkwall, 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 86% failing

Currently

Real-time conditions
Soil Temperature9725.9°C
Dew Point12.2°C (moderate dew point)
Wind Speed8.8m/s (moderate winds)
Cloud Cover19%

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%9m/s
06:000%8.7m/s
07:000%8m/s
08:000%7.7m/s
09:000%6.8m/s
10:000%7.5m/s
11:000%8.1m/s
12:000%8m/s
13:000%8.1m/s
14:000%8.8m/s
15:000%8.8m/s
16:000%8.3m/s
17:000%7.4m/s
18:000%6.6m/s
19:000%6.1m/s
20:000%5.4m/s
21:000%5.4m/s
22:000%5.2m/s
23:000%4.7m/s
Thu, Jul 9
24:000%3.4m/s
01:000%2.5m/s
02:000%1.2m/s
03:000%2.1m/s
04:000%3m/s
05:000%2.8m/s
06:000%2.6m/s
07:000%2.8m/s
08:000%3.4m/s
09:000%3.8m/s
10:000%3.6m/s
11:000%3.4m/s
12:000%2.9m/s
13:000%2.1m/s
14:000%0.49m/s
15:000%1.7m/s
16:000%1.9m/s
17:000%1.5m/s
18:000%0.76m/s
19:000%0.52m/s
20:000%0.75m/s
21:000%1.3m/s
22:000%1.7m/s
23:000%1.6m/s
Fri, Jul 10
24:000%1.7m/s
01:000%1.9m/s
02:000%2m/s
03:000%2.1m/s
04:000%1.2m/s
05:000%0.99m/s
06:000%0.92m/s
07:000%2.7m/s
08:000%3.7m/s
09:000%4m/s
10:000%5.8m/s
11:000%6.1m/s
12:000%4.5m/s
13:000%5.1m/s
14:000%4.1m/s
15:000%3.4m/s
16:000%3.9m/s
17:000%4.4m/s
18:000%5m/s
19:000%5m/s
20:000%4.7m/s
21:000%4.4m/s
22:000%4.1m/s
23:000%3.8m/s
Sat, Jul 11
24:000%3.4m/s
01:000%3.1m/s
02:000%3.2m/s
03:000%3.3m/s
04:000%3.3m/s
05:000%3.3m/s
06:000%3.2m/s
07:000%3.1m/s
08:000%3.1m/s
09:000%3m/s
10:000%2.9m/s
11:000%2.9m/s
12:000%2.9m/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 04:13 Sunset 22:19
15:00
12°C 9726°C 14°C - 19% 0.13kPa
16:00
12°C 9726°C 14°C - 0% 0.14kPa
17:00
12°C 9726°C 13°C - 0% 0.13kPa
18:00
12°C 9726°C 13°C - 0% 0.13kPa
19:00
12°C 9726°C 13°C - 22% 0.14kPa
20:00
12°C 9726°C 13°C - 51% 0.14kPa
21:00
12°C 9726°C 13°C - 93% 0.13kPa
22:00
12°C 9726°C 13°C - 100% 0.11kPa
23:00
12°C 9726°C 13°C - 99% 0.09kPa
Thu, Jul 9 Sunrise 04:13 Sunset 22:19
24:00
12°C 9726°C 13°C - 78% 0.08kPa
01:00
12°C 9726°C 13°C - 93% 0.08kPa
02:00
12°C 9726°C 13°C - 74% 0.08kPa
03:00
12°C 9726°C 13°C - 21% 0.09kPa
04:00
12°C 9726°C 13°C - 8% 0.06kPa
05:00
12°C 9726°C 12°C - 19% 0.04kPa
06:00
12°C 9726°C 12°C - 27% 0.03kPa
07:00
12°C 9726°C 13°C - 56% 0.03kPa
08:00
12°C 9726°C 13°C - 77% 0.06kPa
09:00
12°C 9726°C 13°C - 66% 0.07kPa
10:00
12°C 9726°C 13°C - 80% 0.05kPa
11:00
12°C 9726°C 13°C - 80% 0.03kPa
12:00
12°C 9726°C 12°C - 80% 0.03kPa
13:00
12°C 9726°C 13°C - 79% 0.04kPa
14:00
12°C 9726°C 13°C - 98% 0.08kPa
15:00
12°C 9726°C 13°C - 100% 0.11kPa
16:00
13°C 9726°C 14°C - 100% 0.11kPa
17:00
13°C 9726°C 14°C - 100% 0.11kPa
18:00
13°C 9726°C 14°C - 100% 0.1kPa
19:00
13°C 9726°C 14°C - 100% 0.09kPa
20:00
13°C 9726°C 14°C - 100% 0.09kPa
21:00
13°C 9726°C 14°C - 100% 0.09kPa
22:00
13°C 9726°C 14°C - 100% 0.09kPa
23:00
13°C 9726°C 14°C - 100% 0.08kPa
Fri, Jul 10 Sunrise 04:15 Sunset 22:18
24:00
13°C 9726°C 14°C - 100% 0.07kPa
01:00
13°C 9726°C 14°C - 98% 0.08kPa
02:00
13°C 9726°C 13°C - 100% 0.07kPa
03:00
13°C 9726°C 13°C - 99% 0.06kPa
04:00
13°C 9726°C 13°C - 100% 0.05kPa
05:00
13°C 9726°C 13°C - 100% 0.05kPa
06:00
13°C 9726°C 13°C - 100% 0.05kPa
07:00
13°C 9726°C 13°C - 100% 0.04kPa
08:00
12°C 9726°C 13°C - 100% 0.04kPa
09:00
12°C 9726°C 12°C - 99% 0.07kPa
10:00
11°C 9726°C 12°C - 100% 0.1kPa
11:00
9.9°C 9726°C 11°C - 100% 0.12kPa
12:00
9.5°C 9726°C 11°C - 100% 0.14kPa
13:00
9.5°C 9726°C 11°C - 100% 0.12kPa
14:00
9.8°C 9726°C 11°C - 100% 0.09kPa
15:00
9.7°C 9726°C 11°C - 100% 0.11kPa
16:00
10°C 9726°C 12°C - 100% 0.1kPa
17:00
11°C 9726°C 12°C - 100% 0.11kPa
18:00
11°C 9726°C 12°C - 100% 0.12kPa
19:00
11°C 9726°C 12°C - 100% 0.11kPa
20:00
11°C 9726°C 12°C - 67% 0.11kPa
21:00
11°C 9726°C 12°C - 33% 0.12kPa
22:00
11°C 9726°C 12°C - 0% 0.12kPa
23:00
10°C 9726°C 12°C - 0% 0.13kPa
Sat, Jul 11 Sunrise 04:16 Sunset 22:16
24:00
10°C 9726°C 12°C - 0% 0.14kPa
01:00
10°C 9726°C 12°C - 0% 0.14kPa
02:00
10°C 9726°C 12°C - 20% 0.15kPa
03:00
10°C 9726°C 12°C - 40% 0.16kPa
04:00
10°C 9726°C 12°C - 59% 0.16kPa
05:00
10°C 9726°C 12°C - 40% 0.17kPa
06:00
10°C 9726°C 12°C - 20% 0.18kPa
07:00
10°C 9726°C 12°C - 0% 0.19kPa
08:00
10°C 9726°C 12°C - 2% 0.22kPa
09:00
9.9°C 9726°C 13°C - 3% 0.24kPa
10:00
9.8°C 9726°C 13°C - 5% 0.26kPa
11:00
9.6°C 9726°C 13°C - 25% 0.28kPa
12:00
9.5°C 9726°C 13°C - 45% 0.3kPa
13:00
9.3°C 9726°C 13°C - 65% 0.32kPa
14:00
9.3°C 9726°C 13°C - 66% 0.32kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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