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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 83% failing
Wind Speed 83% failing

Currently

Real-time conditions
Soil Temperature13.5°C
Dew Point13.2°C (moderate dew point)
Wind Speed2.9m/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%2.1m/s
07:000%2.2m/s
08:000%2.2m/s
09:000%2.1m/s
10:000%1.8m/s
11:000%2.2m/s
12:000%2.4m/s
13:000%2.6m/s
14:000%2.8m/s
15:000%2.9m/s
16:000%3m/s
17:000%2.9m/s
18:000%2.7m/s
19:000%2.6m/s
20:000%2.3m/s
21:000%2m/s
22:000%1.9m/s
23:000%1.8m/s
Thu, Jul 9
24:000%1.8m/s
01:000%1.8m/s
02:000%1.8m/s
03:000%1.8m/s
04:000%1.8m/s
05:000%1.6m/s
06:000%1.5m/s
07:000%1.6m/s
08:000%1.9m/s
09:000%1.9m/s
10:000%2.2m/s
11:000%2.5m/s
12:000%2.8m/s
13:000%3.1m/s
14:000%3.3m/s
15:000%3.6m/s
16:000%3.5m/s
17:000%3.7m/s
18:000%3.6m/s
19:000%2.6m/s
20:000%2.1m/s
21:000%2.1m/s
22:000%1.9m/s
23:000%1.7m/s
Fri, Jul 10
24:000%1.6m/s
01:000%1.3m/s
02:000%1.3m/s
03:000%1.1m/s
04:000%1.4m/s
05:000%1.2m/s
06:000%1.2m/s
07:000%0.47m/s
08:000%0.49m/s
09:000%1.7m/s
10:000%1.7m/s
11:000%2.1m/s
12:000%2.8m/s
13:000%2.2m/s
14:000%1.9m/s
15:000%2.8m/s
16:000%3.2m/s
17:000%2.3m/s
18:000%1.6m/s
19:000%1.4m/s
20:000%1.6m/s
21:000%1.7m/s
22:000%1.8m/s
23:000%1.9m/s
Sat, Jul 11
24:000%1.9m/s
01:000%1.9m/s
02:000%1.8m/s
03:000%1.8m/s
04:000%1.7m/s
05:000%1.7m/s
06:000%1.7m/s
07:000%1.7m/s
08:000%1.6m/s
09:000%1.4m/s
10:000%1.3m/s
11:000%1.4m/s
12:000%1.5m/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 04:37 Sunset 22:05
15:00
13°C 13°C 20°C - 5% 0.84kPa
16:00
13°C 14°C 20°C - 3% 0.89kPa
17:00
13°C 14°C 20°C - 5% 0.91kPa
18:00
13°C 14°C 20°C - 5% 0.88kPa
19:00
13°C 14°C 19°C - 5% 0.78kPa
20:00
14°C 15°C 18°C - 5% 0.51kPa
21:00
13°C 15°C 16°C - 6% 0.29kPa
22:00
12°C 15°C 13°C - 100% 0.14kPa
23:00
11°C 14°C 12°C - 0% 0.11kPa
Thu, Jul 9 Sunrise 04:37 Sunset 22:05
24:00
11°C 14°C 12°C - 0% 0.09kPa
01:00
10°C 14°C 11°C - 0% 0.08kPa
02:00
9.8°C 14°C 11°C - 0% 0.07kPa
03:00
9.7°C 14°C 10°C - 0% 0.06kPa
04:00
9.6°C 13°C 10°C - 0% 0.05kPa
05:00
9.4°C 13°C 10°C - 0% 0.05kPa
06:00
10°C 13°C 11°C - 0% 0.06kPa
07:00
11°C 13°C 13°C - 0% 0.16kPa
08:00
12°C 13°C 15°C - 0% 0.28kPa
09:00
13°C 13°C 16°C - 0% 0.4kPa
10:00
13°C 13°C 18°C - 14% 0.53kPa
11:00
13°C 14°C 19°C - 17% 0.64kPa
12:00
14°C 14°C 20°C - 47% 0.77kPa
13:00
14°C 14°C 21°C - 100% 0.85kPa
14:00
14°C 15°C 21°C - 100% 0.85kPa
15:00
14°C 15°C 21°C - 100% 0.85kPa
16:00
14°C 15°C 21°C - 100% 0.83kPa
17:00
14°C 15°C 20°C - 100% 0.79kPa
18:00
14°C 15°C 19°C - 77% 0.69kPa
19:00
14°C 16°C 19°C - 51% 0.62kPa
20:00
14°C 16°C 18°C - 100% 0.45kPa
21:00
14°C 16°C 16°C - 100% 0.24kPa
22:00
13°C 15°C 14°C - 79% 0.12kPa
23:00
12°C 15°C 13°C - 5% 0.08kPa
Fri, Jul 10 Sunrise 04:38 Sunset 22:04
24:00
12°C 15°C 12°C - 0% 0.07kPa
01:00
11°C 15°C 12°C - 0% 0.07kPa
02:00
11°C 15°C 12°C - 100% 0.07kPa
03:00
11°C 14°C 12°C - 100% 0.07kPa
04:00
11°C 14°C 12°C - 100% 0.07kPa
05:00
11°C 14°C 12°C - 100% 0.07kPa
06:00
12°C 14°C 13°C - 100% 0.1kPa
07:00
12°C 14°C 14°C - 78% 0.17kPa
08:00
13°C 14°C 16°C - 77% 0.3kPa
09:00
13°C 14°C 17°C - 70% 0.43kPa
10:00
14°C 14°C 18°C - 100% 0.57kPa
11:00
14°C 14°C 19°C - 100% 0.69kPa
12:00
14°C 15°C 20°C - 100% 0.81kPa
13:00
13°C 15°C 21°C - 100% 0.9kPa
14:00
13°C 15°C 21°C - 100% 0.95kPa
15:00
13°C 16°C 21°C - 100% 0.95kPa
16:00
14°C 16°C 20°C - 100% 0.81kPa
17:00
14°C 16°C 20°C - 100% 0.71kPa
18:00
15°C 16°C 19°C - 100% 0.49kPa
19:00
14°C 16°C 19°C - 100% 0.54kPa
20:00
14°C 16°C 17°C - 100% 0.32kPa
21:00
13°C 16°C 15°C - 100% 0.15kPa
22:00
13°C 15°C 13°C - 100% 0.01kPa
23:00
12°C 15°C 13°C - 100% 0.01kPa
Sat, Jul 11 Sunrise 04:40 Sunset 22:03
24:00
12°C 15°C 12°C - 100% 0.01kPa
01:00
12°C 15°C 12°C - 100% 0.02kPa
02:00
12°C 15°C 12°C - 100% 0.03kPa
03:00
11°C 15°C 12°C - 100% 0.04kPa
04:00
11°C 14°C 11°C - 100% 0.05kPa
05:00
11°C 14°C 12°C - 98% 0.08kPa
06:00
11°C 14°C 12°C - 96% 0.13kPa
07:00
11°C 14°C 13°C - 93% 0.17kPa
08:00
11°C 14°C 14°C - 96% 0.24kPa
09:00
11°C 14°C 14°C - 98% 0.32kPa
10:00
11°C 14°C 15°C - 100% 0.4kPa
11:00
11°C 14°C 15°C - 100% 0.35kPa
12:00
11°C 14°C 14°C - 100% 0.3kPa
13:00
11°C 14°C 14°C - 100% 0.26kPa
14:00
11°C 14°C 13°C - 100% 0.21kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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