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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 88% failing
Wind Speed 78% failing

Currently

Real-time conditions
Soil Temperature3.5°C
Dew Point-1.4°C (low dew point)
Wind Speed1.8m/s (calm conditions)
Cloud Cover77%

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 73 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
Mon, Apr 20
06:0033%1.5m/s
07:0033%1.6m/s
08:0033%1.7m/s
09:0036%1.8m/s
10:0035%1.7m/s
11:0035%1.7m/s
12:0033%1.9m/s
13:0033%2m/s
14:0033%2.1m/s
15:0028%1.9m/s
16:0028%1.9m/s
17:0020%2m/s
18:0020%2.1m/s
19:0017%2.3m/s
20:0017%2.5m/s
21:0017%2m/s
22:0017%2m/s
23:0017%2.2m/s
Tue, Apr 21
24:0018%2.2m/s
01:0017%1.9m/s
02:0017%1.9m/s
03:0017%2.2m/s
04:0017%2.4m/s
05:0017%2.3m/s
06:0017%2.4m/s
07:0015%2.2m/s
08:0015%2.2m/s
09:0020%3.4m/s
10:0024%5m/s
11:0029%5.4m/s
12:0028%5.9m/s
13:0040%6.3m/s
14:0044%6.4m/s
15:0042%6.3m/s
16:004.1%6.4m/s
17:004.1%6.4m/s
18:004.3%5.9m/s
19:004.7%4.6m/s
20:004.7%2.5m/s
21:004.4%1.5m/s
22:0045%1.4m/s
23:0037%1.6m/s
Wed, Apr 22
24:0037%1.6m/s
01:0035%1.9m/s
02:0035%2m/s
03:0032%2.1m/s
04:0032%2.3m/s
05:0032%2.2m/s
06:0028%2.3m/s
07:0032%2.3m/s
08:0043%2.2m/s
09:0048%2.1m/s
10:0052%2.2m/s
11:0050%2m/s
12:0047%2.6m/s
13:0043%3.3m/s
14:0052%2.6m/s
15:0043%1.8m/s
16:002.9%1.1m/s
17:0030%0.95m/s
18:0032%0.8m/s
19:0032%0.64m/s
20:0032%0.6m/s
21:0036%0.55m/s
22:0036%0.51m/s
23:0036%0.45m/s
Thu, Apr 23
24:0038%0.39m/s
01:0038%0.33m/s
02:0049%0.58m/s
03:0050%0.84m/s
04:0052%1.1m/s
05:0052%1.4m/s
06:0047%1.7m/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
Mon, Apr 20 Sunrise 05:57 Sunset 20:35
09:00
-1.4°C 3.5°C 4.1°C - 77% 0.27kPa
10:00
-1°C 3.9°C 4.9°C - 88% 0.3kPa
11:00
-0.5°C 4.3°C 5.5°C - 97% 0.31kPa
12:00
0°C 4.7°C 5.9°C - 100% 0.32kPa
13:00
0.6°C 5°C 6°C - 100% 0.3kPa
14:00
1.3°C 5.2°C 5.9°C - 100% 0.26kPa
15:00
2.1°C 5.5°C 5.6°C - 100% 0.2kPa
16:00
2.4°C 5.6°C 5.5°C - 100% 0.17kPa
17:00
2.7°C 5.6°C 5.4°C - 100% 0.15kPa
18:00
2.9°C 5.6°C 5.1°C - 99% 0.12kPa
19:00
2.8°C 5.5°C 4.6°C - 98% 0.1kPa
20:00
2.4°C 5.4°C 4.2°C - 90% 0.1kPa
21:00
2.2°C 5.3°C 3.4°C - 100% 0.07kPa
22:00
2.3°C 5.1°C 3.3°C - 100% 0.05kPa
23:00
2.2°C 5°C 3.4°C - 83% 0.07kPa
Tue, Apr 21 Sunrise 05:57 Sunset 20:35
24:00
1°C 4.8°C 2.9°C - 77% 0.09kPa
01:00
1.2°C 4.6°C 2.6°C - 100% 0.07kPa
02:00
1.6°C 4.4°C 2.9°C - 100% 0.07kPa
03:00
1.8°C 4.3°C 3.1°C - 100% 0.07kPa
04:00
1.4°C 4.2°C 3°C - 100% 0.09kPa
05:00
1.5°C 4.1°C 2.8°C - 100% 0.07kPa
06:00
1.8°C 4°C 3.1°C - 100% 0.06kPa
07:00
2.5°C 4°C 2.7°C - 100% 0.01kPa
08:00
2.5°C 3.9°C 2.9°C - 91% 0.02kPa
09:00
0.9°C 4°C 3.6°C - 94% 0.14kPa
10:00
0.8°C 4.1°C 4.5°C - 94% 0.19kPa
11:00
0.7°C 4.3°C 5.1°C - 96% 0.23kPa
12:00
0.2°C 4.5°C 6°C - 74% 0.32kPa
13:00
-0.2°C 4.9°C 7.5°C - 15% 0.44kPa
14:00
-1°C 5.5°C 8.6°C - 5% 0.54kPa
15:00
-1.4°C 6°C 9°C - 5% 0.59kPa
16:00
-1.9°C 6.4°C 8.7°C - 5% 0.59kPa
17:00
-2.3°C 6.6°C 8.2°C - 5% 0.57kPa
18:00
-2.1°C 6.8°C 7.4°C - 1% 0.51kPa
19:00
-1.4°C 6.8°C 6.3°C - 0% 0.4kPa
20:00
-1.2°C 6.5°C 4.5°C - 0% 0.28kPa
21:00
-1.7°C 6.1°C 2.5°C - 0% 0.19kPa
22:00
-1.6°C 5.7°C 1.9°C - 0% 0.16kPa
23:00
-1.6°C 5.2°C 1.3°C - 0% 0.13kPa
Wed, Apr 22 Sunrise 05:54 Sunset 20:37
24:00
-1.6°C 4.9°C 0.96°C - 0% 0.11kPa
01:00
-1.9°C 4.6°C 0.7°C - 0% 0.11kPa
02:00
-2.2°C 4.5°C 0.38°C - 0% 0.11kPa
03:00
-2.2°C 4.5°C 0.28°C - 0% 0.1kPa
04:00
-2°C 4.5°C 0.12°C - 3% 0.09kPa
05:00
-1.4°C 4.5°C 0.03°C - 5% 0.06kPa
06:00
-0.8°C 4.4°C 0.14°C - 5% 0.04kPa
07:00
0°C 4.1°C 1.4°C - 5% 0.06kPa
08:00
0.7°C 4.2°C 3.8°C - 1% 0.16kPa
09:00
0.9°C 4.1°C 5.9°C - 0% 0.28kPa
10:00
0.6°C 4.2°C 7.5°C - 5% 0.4kPa
11:00
0.4°C 4.2°C 9.1°C - 5% 0.52kPa
12:00
0.4°C 4.4°C 10°C - 5% 0.61kPa
13:00
0.9°C 5°C 11°C - 5% 0.66kPa
14:00
1.9°C 5.4°C 8.2°C - 5% 0.39kPa
15:00
2.2°C 5.8°C 5.5°C - 6% 0.19kPa
16:00
1.9°C 6.3°C 2.8°C - 6% 0.04kPa
17:00
1.7°C 5.9°C 2.5°C - 4% 0.04kPa
18:00
1.4°C 5.5°C 2.3°C - 2% 0.04kPa
19:00
1.2°C 5.2°C 2°C - 0% 0.04kPa
20:00
0.9°C 4.9°C 1.8°C - 0% 0.05kPa
21:00
0.5°C 4.6°C 1.7°C - 0% 0.05kPa
22:00
0.2°C 4.3°C 1.5°C - 0% 0.06kPa
23:00
0.3°C 4.1°C 1.8°C - 0% 0.07kPa
Thu, Apr 23 Sunrise 05:52 Sunset 20:39
24:00
0.4°C 3.9°C 2.1°C - 0% 0.08kPa
01:00
0.5°C 3.7°C 2.5°C - 0% 0.09kPa
02:00
1.3°C 3.9°C 4.8°C - 0% 0.19kPa
03:00
1.8°C 4.1°C 7.1°C - 0% 0.31kPa
04:00
2°C 4.4°C 9.4°C - 0% 0.48kPa
05:00
1.8°C 5.1°C 11°C - 1% 0.59kPa
06:00
1.4°C 5.8°C 12°C - 2% 0.73kPa
07:00
0.8°C 6.6°C 13°C - 3% 0.88kPa
08:00
1.1°C 7.2°C 14°C - 2% 0.89kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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