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Rule Morning Frost

Cairngorms - Morning Frost - Scotland

Aviemore, 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 83% failing
Wind Speed 82% failing

Currently

Real-time conditions
Soil Temperature16.0°C
Dew Point11.2°C (moderate dew point)
Wind Speed3.6m/s (calm conditions)
Cloud Cover5%

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%2.9m/s
07:000%3m/s
08:000%3.3m/s
09:000%3.5m/s
10:000%3.4m/s
11:000%3.3m/s
12:000%3.4m/s
13:000%3.4m/s
14:000%3.6m/s
15:000%3.6m/s
16:000%3.8m/s
17:000%3.8m/s
18:000%3.7m/s
19:000%3.4m/s
20:000%2.7m/s
21:000%1.9m/s
22:000%1.9m/s
23:000%2.5m/s
Thu, Jul 9
24:000%2.7m/s
01:000%2.7m/s
02:000%2.7m/s
03:000%2.6m/s
04:000%2.7m/s
05:000%2.7m/s
06:000%2.4m/s
07:000%2.5m/s
08:000%2.4m/s
09:000%2.7m/s
10:000%2.9m/s
11:000%3m/s
12:000%3.4m/s
13:000%3.5m/s
14:000%3.8m/s
15:000%3.8m/s
16:000%3.6m/s
17:000%3.9m/s
18:000%4.4m/s
19:000%3.2m/s
20:000%2.9m/s
21:000%2.2m/s
22:000%1.6m/s
23:000%1.5m/s
Fri, Jul 10
24:000%1.7m/s
01:000%1.9m/s
02:000%2m/s
03:000%1.9m/s
04:000%1.8m/s
05:000%1.3m/s
06:000%1.1m/s
07:000%0.9m/s
08:000%1.1m/s
09:000%1m/s
10:000%2m/s
11:000%1.5m/s
12:000%3.5m/s
13:000%4m/s
14:000%3.2m/s
15:000%2m/s
16:000%2.6m/s
17:000%2.2m/s
18:000%2.6m/s
19:000%2.8m/s
20:000%2.7m/s
21:000%2.6m/s
22:000%2.4m/s
23:000%2.4m/s
Sat, Jul 11
24:000%2.4m/s
01:000%2.4m/s
02:000%2.3m/s
03:000%2.2m/s
04:000%2.1m/s
05:000%1.6m/s
06:000%1.1m/s
07:000%0.69m/s
08:000%0.76m/s
09:000%0.82m/s
10:000%0.89m/s
11:000%1.1m/s
12:000%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
Wed, Jul 8 Sunrise 04:32 Sunset 22:07
15:00
11°C 16°C 24°C - 5% 1.7kPa
16:00
11°C 16°C 24°C - 4% 1.7kPa
17:00
11°C 17°C 24°C - 5% 1.6kPa
18:00
12°C 17°C 23°C - 5% 1.4kPa
19:00
12°C 17°C 22°C - 5% 1.2kPa
20:00
13°C 17°C 21°C - 6% 0.9kPa
21:00
14°C 17°C 18°C - 19% 0.51kPa
22:00
13°C 17°C 15°C - 100% 0.24kPa
23:00
13°C 17°C 14°C - 37% 0.15kPa
Thu, Jul 9 Sunrise 04:32 Sunset 22:07
24:00
12°C 17°C 13°C - 2% 0.1kPa
01:00
12°C 16°C 13°C - 5% 0.09kPa
02:00
11°C 16°C 12°C - 4% 0.11kPa
03:00
10°C 16°C 12°C - 0% 0.12kPa
04:00
10°C 15°C 12°C - 0% 0.13kPa
05:00
10°C 15°C 12°C - 2% 0.13kPa
06:00
11°C 15°C 13°C - 0% 0.22kPa
07:00
11°C 15°C 15°C - 0% 0.43kPa
08:00
11°C 15°C 18°C - 0% 0.66kPa
09:00
12°C 15°C 19°C - 0% 0.85kPa
10:00
12°C 15°C 21°C - 0% 1kPa
11:00
12°C 16°C 22°C - 0% 1.2kPa
12:00
12°C 16°C 23°C - 0% 1.4kPa
13:00
12°C 16°C 24°C - 63% 1.5kPa
14:00
12°C 17°C 24°C - 100% 1.6kPa
15:00
13°C 17°C 24°C - 100% 1.5kPa
16:00
13°C 17°C 24°C - 100% 1.4kPa
17:00
13°C 18°C 23°C - 100% 1.4kPa
18:00
13°C 18°C 22°C - 100% 1.2kPa
19:00
13°C 18°C 21°C - 100% 1kPa
20:00
14°C 18°C 20°C - 100% 0.76kPa
21:00
14°C 18°C 18°C - 100% 0.47kPa
22:00
13°C 18°C 16°C - 100% 0.25kPa
23:00
13°C 17°C 15°C - 52% 0.17kPa
Fri, Jul 10 Sunrise 04:33 Sunset 22:06
24:00
13°C 17°C 14°C - 20% 0.13kPa
01:00
13°C 17°C 14°C - 1% 0.11kPa
02:00
12°C 17°C 13°C - 62% 0.1kPa
03:00
12°C 16°C 13°C - 100% 0.1kPa
04:00
12°C 16°C 13°C - 87% 0.09kPa
05:00
12°C 16°C 13°C - 81% 0.08kPa
06:00
12°C 16°C 14°C - 100% 0.18kPa
07:00
12°C 15°C 16°C - 98% 0.33kPa
08:00
13°C 16°C 18°C - 70% 0.55kPa
09:00
13°C 16°C 20°C - 77% 0.82kPa
10:00
13°C 16°C 21°C - 67% 1kPa
11:00
12°C 16°C 22°C - 96% 1.3kPa
12:00
13°C 17°C 22°C - 100% 1.2kPa
13:00
14°C 17°C 21°C - 100% 0.96kPa
14:00
13°C 17°C 21°C - 100% 1.1kPa
15:00
13°C 17°C 20°C - 100% 0.79kPa
16:00
14°C 17°C 18°C - 100% 0.43kPa
17:00
14°C 17°C 18°C - 100% 0.44kPa
18:00
13°C 17°C 17°C - 100% 0.38kPa
19:00
13°C 17°C 15°C - 100% 0.2kPa
20:00
12°C 16°C 13°C - 100% 0.14kPa
21:00
11°C 16°C 12°C - 100% 0.08kPa
22:00
9.9°C 15°C 10°C - 100% 0.04kPa
23:00
9.7°C 14°C 10°C - 100% 0.04kPa
Sat, Jul 11 Sunrise 04:34 Sunset 22:05
24:00
9.5°C 14°C 10°C - 100% 0.05kPa
01:00
9.3°C 14°C 10°C - 100% 0.06kPa
02:00
9.4°C 14°C 10°C - 100% 0.08kPa
03:00
9.6°C 14°C 11°C - 100% 0.11kPa
04:00
9.8°C 13°C 11°C - 100% 0.14kPa
05:00
10°C 13°C 12°C - 100% 0.18kPa
06:00
10°C 13°C 13°C - 100% 0.23kPa
07:00
10°C 13°C 13°C - 100% 0.29kPa
08:00
10°C 13°C 14°C - 100% 0.33kPa
09:00
10°C 14°C 14°C - 100% 0.38kPa
10:00
10°C 14°C 15°C - 100% 0.44kPa
11:00
9.8°C 14°C 15°C - 100% 0.5kPa
12:00
9.2°C 14°C 15°C - 100% 0.56kPa
13:00
8.7°C 14°C 15°C - 99% 0.62kPa
14:00
8.5°C 14°C 15°C - 96% 0.54kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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