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Rule Morning Frost

Ullapool - Morning Frost - Scotland

Ullapool, 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 Temperature8.1°C
Dew Point5.4°C (moderate dew point)
Wind Speed3.0m/s (calm conditions)
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 95 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, Apr 8
02:000%1.4m/s
03:000%3.1m/s
04:000%3.4m/s
05:000%2.2m/s
06:000%1.7m/s
07:000%1.5m/s
08:000%0.86m/s
09:002.1%1.3m/s
10:000%1.2m/s
11:000%2.4m/s
12:000%3.3m/s
13:000%4.1m/s
14:000%4.9m/s
15:000%4.1m/s
16:000%4m/s
17:000%3.1m/s
18:000%3.1m/s
19:000%2.8m/s
20:000%2.3m/s
21:000%2.9m/s
22:000%2.6m/s
23:000%2.6m/s
Thu, Apr 9
24:000%3.1m/s
01:000%2.5m/s
02:000%2.5m/s
03:000%3m/s
04:000%3.1m/s
05:001.7%3.2m/s
06:001%3.4m/s
07:001.2%5.2m/s
08:001%7m/s
09:001%8.8m/s
10:001.1%7.9m/s
11:002.1%5.7m/s
12:003.7%8.6m/s
13:004.1%9.1m/s
14:004.5%8.5m/s
15:004.5%8.1m/s
16:003%6.7m/s
17:002.5%4.2m/s
18:000.8%4.7m/s
19:001.2%2.2m/s
20:001.4%3.3m/s
21:001%5.9m/s
22:0014%6.4m/s
23:0022%6.9m/s
Fri, Apr 10
24:0027%7.4m/s
01:0031%7.7m/s
02:0034%7.1m/s
03:0042%6.7m/s
04:0034%6.6m/s
05:0031%6.3m/s
06:0035%5.1m/s
07:0030%4.5m/s
08:0033%4.7m/s
09:0046%5.1m/s
10:0046%5.4m/s
11:0050%5.2m/s
12:0031%4.2m/s
13:0033%3.1m/s
14:0033%3.4m/s
15:0031%4.6m/s
16:003%4.5m/s
17:003%5.3m/s
18:003%5.7m/s
19:002.7%6.4m/s
20:0032%5.9m/s
21:0027%7.3m/s
22:0027%7m/s
23:0027%7.9m/s
Sat, Apr 11
24:0031%9.3m/s
01:0022%8.4m/s
02:0014%8.2m/s
03:0011%7.9m/s
04:0011%7.6m/s
05:0011%6.1m/s
06:0015%6.5m/s
07:0042%5.7m/s
08:0044%5.4m/s
09:0038%5.1m/s
10:0033%4.8m/s
11:0036%4.3m/s
12:0044%3.9m/s
13:0048%3.5m/s
14:0046%3.9m/s
15:0040%4.4m/s
16:0033%4.8m/s
17:0025%4.4m/s
18:0018%4.1m/s
19:0015%3.7m/s
20:0016%3.6m/s
21:0021%3.4m/s
22:0028%3.2m/s
23:0021%3.1m/s
Sun, Apr 12
24:0018%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
Thu, Apr 9 Sunrise 06:27 Sunset 20:18
03:00
5.4°C 8.1°C 8.4°C - 100% 0.2kPa
04:00
5.9°C 8.1°C 8.3°C - 100% 0.17kPa
05:00
6.3°C 8°C 8°C - 100% 0.12kPa
06:00
6.7°C 7.9°C 7.6°C - 100% 0.06kPa
07:00
5.9°C 7.7°C 7.1°C - 100% 0.08kPa
08:00
4.7°C 7.5°C 5.9°C - 100% 0.08kPa
09:00
3.6°C 7.3°C 4.9°C - 100% 0.08kPa
10:00
2.2°C 7.1°C 3.9°C - 78% 0.1kPa
11:00
1.8°C 7°C 5.1°C - 81% 0.18kPa
12:00
2.2°C 7.1°C 6.3°C - 13% 0.24kPa
13:00
1.5°C 7.2°C 6.8°C - 5% 0.3kPa
14:00
0.8°C 7.3°C 6.9°C - 5% 0.35kPa
15:00
0.2°C 7.4°C 7°C - 6% 0.38kPa
16:00
0.3°C 7.6°C 6.8°C - 100% 0.36kPa
17:00
1.9°C 7.5°C 5.5°C - 100% 0.2kPa
18:00
2.9°C 7.2°C 3.8°C - 100% 0.05kPa
19:00
2.1°C 6.8°C 2.8°C - 82% 0.04kPa
20:00
2.2°C 6.5°C 3.7°C - 100% 0.08kPa
21:00
2.9°C 6.2°C 4.1°C - 100% 0.06kPa
22:00
1.5°C 6°C 4°C - 100% 0.13kPa
23:00
0.5°C 5.7°C 3.7°C - 100% 0.16kPa
Fri, Apr 10 Sunrise 06:27 Sunset 20:18
24:00
-0.5°C 5.5°C 4.1°C - 99% 0.23kPa
01:00
-1.2°C 5.2°C 3.8°C - 55% 0.24kPa
02:00
-1.4°C 4.9°C 3.1°C - 26% 0.21kPa
03:00
-1.7°C 4.6°C 3.2°C - 5% 0.23kPa
04:00
-1.8°C 4.3°C 3°C - 35% 0.22kPa
05:00
-1.8°C 4°C 2.8°C - 55% 0.21kPa
06:00
-1.8°C 3.8°C 2.7°C - 45% 0.21kPa
07:00
-1.7°C 3.6°C 2.3°C - 50% 0.18kPa
08:00
-1.1°C 3.5°C 3.1°C - 37% 0.2kPa
09:00
-0.8°C 3.6°C 3.9°C - 5% 0.23kPa
10:00
-1.1°C 3.8°C 4.8°C - 5% 0.29kPa
11:00
-1.2°C 4°C 5.5°C - 8% 0.35kPa
12:00
-1.6°C 4.5°C 6.2°C - 100% 0.41kPa
13:00
-2.2°C 4.9°C 6.8°C - 100% 0.46kPa
14:00
-2.2°C 5.4°C 7.2°C - 100% 0.5kPa
15:00
-2.2°C 5.8°C 7.3°C - 100% 0.5kPa
16:00
-1.9°C 6.1°C 7.8°C - 100% 0.53kPa
17:00
-0.9°C 6.3°C 7.8°C - 100% 0.49kPa
18:00
-0.4°C 6.3°C 6.9°C - 99% 0.4kPa
19:00
-0.4°C 6.2°C 5.6°C - 67% 0.31kPa
20:00
-0.9°C 6°C 5.8°C - 70% 0.35kPa
21:00
-0.6°C 5.8°C 4.8°C - 90% 0.28kPa
22:00
-0.3°C 5.6°C 4.4°C - 81% 0.24kPa
23:00
0°C 5.3°C 4.6°C - 100% 0.24kPa
Sat, Apr 11 Sunrise 06:24 Sunset 20:20
24:00
-0.3°C 5.2°C 4.6°C - 43% 0.25kPa
01:00
0.3°C 5°C 3.7°C - 100% 0.17kPa
02:00
1.3°C 4.8°C 4°C - 100% 0.14kPa
03:00
2°C 4.7°C 3.2°C - 100% 0.06kPa
04:00
2.1°C 4.5°C 3.3°C - 100% 0.06kPa
05:00
2.1°C 4.4°C 4°C - 100% 0.1kPa
06:00
2.1°C 4.4°C 4.2°C - 70% 0.11kPa
07:00
-0.1°C 4.2°C 4°C - 4% 0.21kPa
08:00
-1.5°C 4.8°C 4.8°C - 17% 0.31kPa
09:00
-3.2°C 5.3°C 5.7°C - 30% 0.43kPa
10:00
-5.5°C 5.8°C 6.5°C - 43% 0.56kPa
11:00
-4.8°C 5.8°C 6.1°C - 30% 0.51kPa
12:00
-4.2°C 5.9°C 5.6°C - 18% 0.46kPa
13:00
-3.7°C 6°C 5.2°C - 5% 0.42kPa
14:00
-3.2°C 5.6°C 4.4°C - 22% 0.35kPa
15:00
-2.8°C 5.3°C 3.6°C - 40% 0.29kPa
16:00
-2.5°C 5°C 2.8°C - 58% 0.24kPa
17:00
-1.4°C 4.8°C 2.4°C - 71% 0.17kPa
18:00
-0.4°C 4.5°C 1.9°C - 84% 0.11kPa
19:00
0.4°C 4.3°C 1.5°C - 97% 0.05kPa
20:00
0.3°C 4.1°C 1.6°C - 71% 0.06kPa
21:00
0.3°C 3.9°C 1.6°C - 44% 0.07kPa
22:00
0.2°C 3.7°C 1.7°C - 18% 0.07kPa
23:00
0.6°C 3.7°C 2.3°C - 46% 0.09kPa
Sun, Apr 12 Sunrise 06:21 Sunset 20:23
24:00
1°C 3.6°C 3°C - 73% 0.1kPa
01:00
1.3°C 3.5°C 3.6°C - 100% 0.12kPa
02:00
1.1°C 3.7°C 4.3°C - 100% 0.16kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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