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Rule Morning Frost

Rannoch Moor - Morning Frost - Scotland

Kinloch Rannoch, 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 86% failing
Wind Speed 79% failing

Currently

Real-time conditions
Soil Temperature1.7°C
Dew Point0.8°C (low dew point)
Wind Speed6.1m/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 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
Sun, Mar 15
04:0035%3m/s
05:0035%3.1m/s
06:0037%2.7m/s
07:0037%2.7m/s
08:0037%2.7m/s
09:0033%4.6m/s
10:0033%5.6m/s
11:0031%6m/s
12:0033%5.3m/s
13:0031%6.1m/s
14:0035%5.7m/s
15:0035%7.4m/s
16:0035%7.9m/s
17:0035%7.6m/s
18:0037%4.3m/s
19:0039%3.7m/s
20:0035%3.5m/s
21:0037%4.3m/s
22:0035%3.9m/s
23:0037%4.7m/s
Mon, Mar 16
24:0037%5.4m/s
01:0031%6.3m/s
02:0033%5.3m/s
03:0033%5.3m/s
04:0033%4.6m/s
05:0033%5.2m/s
06:0033%4.3m/s
07:0035%4m/s
08:0033%5.1m/s
09:0033%5.5m/s
10:0033%5m/s
11:0033%4.3m/s
12:0035%4.1m/s
13:0035%3.4m/s
14:0035%3.2m/s
15:0037%2.7m/s
16:0037%2.1m/s
17:0037%2.2m/s
18:0037%1.9m/s
19:0035%2.9m/s
20:0035%3.7m/s
21:0035%3.9m/s
22:0035%3.3m/s
23:0035%3.8m/s
Tue, Mar 17
24:0035%3.2m/s
01:0037%2.5m/s
02:0037%2.1m/s
03:0037%2.2m/s
04:0037%2.4m/s
05:0037%2.5m/s
06:0037%2.5m/s
07:0037%2.7m/s
08:0037%2.5m/s
09:0035%2.9m/s
10:0033%4.4m/s
11:0033%4.3m/s
12:0035%4m/s
13:0035%3.8m/s
14:0035%3.6m/s
15:0035%3.7m/s
16:0035%3.2m/s
17:0020%2.8m/s
18:0022%2.1m/s
19:0015%1.9m/s
20:0017%1.6m/s
21:0015%1.4m/s
22:0015%1.3m/s
23:0015%1.2m/s
Wed, Mar 18
24:0015%1.1m/s
01:0015%1.1m/s
02:0015%1m/s
03:0015%1m/s
04:0015%1.1m/s
05:0015%1.1m/s
06:0019%1.2m/s
07:0019%1.2m/s
08:0019%1.2m/s
09:0019%1.2m/s
10:0019%1.3m/s
11:0019%1.3m/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
Sun, Mar 15 Sunrise 06:32 Sunset 18:19
13:00
0.8°C 1.7°C 1.4°C - 100% 0.03kPa
14:00
-0.5°C 1.6°C 0.66°C - 91% 0.05kPa
15:00
-0.5°C 1.6°C 0.54°C - 100% 0.05kPa
16:00
-2.1°C 1.6°C 0.28°C - 93% 0.1kPa
17:00
-2.9°C 1.6°C -0.44°C - 100% 0.1kPa
18:00
-2.3°C 1.5°C -1.3°C - 100% 0.04kPa
19:00
-2.2°C 1.5°C -1°C - 100% 0.04kPa
20:00
-2.2°C 1.5°C -1.9°C - 100% 0.01kPa
21:00
-2.9°C 1.4°C -1.6°C - 100% 0.05kPa
22:00
-2.3°C 1.3°C -1.8°C - 100% 0.02kPa
23:00
-2.6°C 1.3°C -1.5°C - 97% 0.04kPa
Mon, Mar 16 Sunrise 06:30 Sunset 18:21
24:00
-2.8°C 1.3°C -1.7°C - 93% 0.04kPa
01:00
-2.3°C 1.3°C -1.6°C - 94% 0.03kPa
02:00
-2.1°C 1.3°C -1.4°C - 100% 0.03kPa
03:00
-1.7°C 1.2°C -1°C - 99% 0.03kPa
04:00
-1.4°C 1.1°C -0.95°C - 99% 0.02kPa
05:00
-1.4°C 1.1°C -0.55°C - 100% 0.03kPa
06:00
-1.1°C 1.1°C -0.65°C - 100% 0.02kPa
07:00
-0.5°C 1.1°C -0.25°C - 100% 0.01kPa
08:00
0°C 1.1°C 0.26°C - 100% 0.01kPa
09:00
0.1°C 1.1°C 0.35°C - 100% 0.01kPa
10:00
0.5°C 1.1°C 0.65°C - 100% 0.01kPa
11:00
1°C 1.1°C 1.2°C - 100% 0.01kPa
12:00
1.4°C 1.1°C 1.6°C - 100% 0.01kPa
13:00
1.5°C 1.1°C 1.6°C - 100% 0kPa
14:00
1.4°C 1.1°C 1.5°C - 100% 0kPa
15:00
1.4°C 1°C 1.4°C - 100% 0kPa
16:00
1.1°C 1.1°C 1.1°C - 100% 0kPa
17:00
1.1°C 1.1°C 1.1°C - 100% 0kPa
18:00
1.1°C 1.1°C 1.1°C - 100% 0kPa
19:00
1.2°C 1.1°C 1.2°C - 100% 0kPa
20:00
2.3°C 1.1°C 2.3°C - 100% 0kPa
21:00
3°C 1.1°C 3°C - 100% 0kPa
22:00
2.5°C 1.1°C 2.5°C - 100% 0kPa
23:00
3.3°C 1.1°C 3.3°C - 100% 0kPa
Tue, Mar 17 Sunrise 06:27 Sunset 18:23
24:00
3.1°C 1.1°C 3.1°C - 100% 0kPa
01:00
2.6°C 1.1°C 2.6°C - 100% 0kPa
02:00
2.5°C 1.1°C 2.5°C - 100% 0kPa
03:00
2.6°C 1.1°C 2.6°C - 100% 0kPa
04:00
2.7°C 1.1°C 2.7°C - 100% 0kPa
05:00
2.8°C 1.1°C 2.8°C - 100% 0kPa
06:00
3°C 1.1°C 3.1°C - 100% 0kPa
07:00
3.4°C 1.1°C 3.4°C - 100% 0kPa
08:00
3.6°C 1.1°C 3.6°C - 100% 0kPa
09:00
3.8°C 1.1°C 4°C - 100% 0.01kPa
10:00
4.7°C 1.1°C 4.8°C - 100% 0.01kPa
11:00
4.7°C 1.1°C 5°C - 100% 0.02kPa
12:00
5°C 1°C 5.2°C - 100% 0.01kPa
13:00
5°C 1.2°C 5.2°C - 100% 0.01kPa
14:00
5.2°C 1.4°C 5.4°C - 100% 0.01kPa
15:00
5.4°C 1.6°C 5.6°C - 100% 0.02kPa
16:00
5.3°C 1.8°C 5.6°C - 100% 0.02kPa
17:00
5°C 2.1°C 5.4°C - 100% 0.02kPa
18:00
4.5°C 2.2°C 4.7°C - 100% 0.01kPa
19:00
4.8°C 3°C 4.9°C - 100% 0.01kPa
20:00
5°C 3.8°C 5.1°C - 100% 0.01kPa
21:00
5.2°C 4.6°C 5.3°C - 100% 0.01kPa
22:00
5.1°C 4.6°C 5.2°C - 100% 0.01kPa
23:00
5°C 4.6°C 5.1°C - 100% 0.01kPa
Wed, Mar 18 Sunrise 06:24 Sunset 18:26
24:00
4.9°C 4.5°C 5°C - 100% 0.01kPa
01:00
5°C 4.6°C 5.1°C - 100% 0.01kPa
02:00
5.1°C 4.6°C 5.3°C - 100% 0.01kPa
03:00
5.2°C 4.6°C 5.4°C - 100% 0.01kPa
04:00
5.6°C 4.8°C 6.1°C - 100% 0.04kPa
05:00
5.9°C 4.9°C 6.8°C - 100% 0.06kPa
06:00
6.3°C 5.1°C 7.5°C - 100% 0.08kPa
07:00
6.4°C 5.3°C 7.6°C - 99% 0.08kPa
08:00
6.5°C 5.5°C 7.7°C - 99% 0.09kPa
09:00
6.5°C 5.7°C 7.8°C - 98% 0.09kPa
10:00
6.2°C 5.8°C 7.4°C - 99% 0.08kPa
11:00
5.9°C 5.8°C 6.9°C - 99% 0.07kPa
12:00
5.6°C 5.9°C 6.5°C - 100% 0.06kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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