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More Morning Frost in Trossachs & Loch Lomond
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Rule Morning Frost

Loch Achray - Morning Frost - Trossachs & Loch Lomond

Callander, 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 74% failing

Currently

Real-time conditions
Frost Probability
0%
Soil Temperature11.1°C
Dew Point10.7°C (moderate dew point)
Wind Speed3.7m/s (calm conditions)
Cloud Cover74%

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 identifies when frost conditions will transform the Trossachs landscape into a winter wonderland. We track overnight temperatures, humidity, and wind to predict when clear, calm nights will produce photogenic frost—hoar frost coating vegetation, ice crystals along shorelines, and frozen lochs creating winter magic.

The Trossachs' Highland fringe position means genuine winter cold while remaining accessible. The combination of lochs, forest, and mountains creates varied frost opportunities, from frozen shorelines to summit hoar frost on Ben A'an.

What makes the Trossachs special for frost photography:

  • Loch shorelines - Ice formations at water's edge at Loch Ard and Loch Achray
  • Forest frost - Native oak and birch woodland coated in hoar frost creating fairy-tale scenes
  • Mountain hoar frost - Ben A'an summit vegetation transformed by ice crystal deposits
  • Waterfall ice - Bracklinn Falls near Callander with ice formations and icicles

Loch Ard's forested shoreline after a hard frost creates magical scenes—oak trees coated in hoar frost, ice crystals along the water's edge, frozen grasses catching low winter sunlight. Ben A'an's summit on frosty mornings combines hoar frost with panoramic views across frozen landscape. Bracklinn Falls develops impressive ice formations during cold spells. Best frost photography occurs December-February during high-pressure systems. Timing is critical—frost is most photogenic at sunrise before sun melts the crystals.

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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, May 24
05:00✓0%1.5m/s
06:00✓0%1.4m/s
07:00✕0%1.5m/s
08:00✕0%1.7m/s
09:00✕0%1.8m/s
10:00✕0%2.5m/s
11:00✕0%2.9m/s
12:00✕0%3.1m/s
13:00✕0%3.5m/s
14:00✕0%3.7m/s
15:00✕0%4.9m/s
16:00✕0%5.5m/s
17:00✕0%5.6m/s
18:00✕0%5m/s
19:00✕0%4.6m/s
20:00✕0%3.3m/s
21:00✕0%2.1m/s
22:00✕0%1.7m/s
23:00✕0%1.4m/s
Mon, May 25
24:00✕0%1.2m/s
01:00✕0%1.2m/s
02:00✕0%1.3m/s
03:00✕0%1.4m/s
04:00✓0%1.4m/s
05:00✓0%1.4m/s
06:00✓0%1.5m/s
07:00✕0%1.7m/s
08:00✕0%2m/s
09:00✕0%2.1m/s
10:00✕0%3.1m/s
11:00✕0%4.8m/s
12:00✕0%5.6m/s
13:00✕0%6.1m/s
14:00✕0%6.4m/s
15:00✕0%6.1m/s
16:00✕0%5.8m/s
17:00✕0%5.4m/s
18:00✕0%4.4m/s
19:00✕0%3m/s
20:00✕0%2.1m/s
21:00✕0%1.6m/s
22:00✕0%1.5m/s
23:00✕0%1.4m/s
Tue, May 26
24:00✕0%1.6m/s
01:00✕0%1.8m/s
02:00✕0%1.9m/s
03:00✕0%1.9m/s
04:00✓0%1.9m/s
05:00✓0%1.9m/s
06:00✓0%1.8m/s
07:00✕0%1.6m/s
08:00✕0%1.2m/s
09:00✕0%1.2m/s
10:00✕0%1.3m/s
11:00✕0%0.96m/s
12:00✕0%0.65m/s
13:00✕0%0.73m/s
14:00✕0%0.82m/s
15:00✕0%0.63m/s
16:00✕0%0.59m/s
17:00✕0%0.76m/s
18:00✕0%3m/s
19:00✕0%3.1m/s
20:00✕0%2.9m/s
21:00✕0%2.6m/s
22:00✕0%2.4m/s
23:00✕0%2.4m/s
Wed, May 27
24:00✕0%2.5m/s
01:00✕0%2.6m/s
02:00✕0%2.8m/s
03:00✓0%3m/s
04:00✓0%3.1m/s
05:00✓0%3.1m/s
06:00✓0%3.2m/s
07:00✕0%3.2m/s
08:00✕0%3.2m/s
09:00✕0%3.3m/s
10:00✕0%3.4m/s
11:00✕0%3.5m/s
12:00✕0%3.6m/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, May 24 Sunrise 04:48 Sunset 21:40
14:00
11°C 11°C 16°C - 74% 0.58kPa
15:00
10°C 11°C 18°C - 31% 0.75kPa
16:00
10°C 12°C 18°C - 31% 0.82kPa
17:00
11°C 12°C 18°C - 31% 0.8kPa
18:00
12°C 12°C 18°C - 40% 0.66kPa
19:00
12°C 12°C 17°C - 14% 0.51kPa
20:00
12°C 12°C 15°C - 5% 0.36kPa
21:00
11°C 12°C 13°C - 5% 0.18kPa
22:00 ☾
10°C 12°C 11°C - 4% 0.1kPa
23:00 ☾
9.5°C 12°C 11°C - 5% 0.09kPa
Mon, May 25 Sunrise 04:48 Sunset 21:40
24:00 ☾
9°C 12°C 10°C - 5% 0.08kPa
01:00 ☾
8.7°C 12°C 9.6°C - 5% 0.07kPa
02:00 ☾
8.4°C 11°C 9.2°C - 5% 0.06kPa
03:00 ☾
8.2°C 11°C 8.9°C - 5% 0.05kPa
04:00 ☾
8°C 11°C 8.5°C - 4% 0.04kPa
05:00
7.8°C 11°C 8.3°C - 5% 0.04kPa
06:00
8.5°C 11°C 9.1°C - 5% 0.04kPa
07:00
9.7°C 11°C 11°C - 7% 0.12kPa
08:00
10°C 11°C 13°C - 6% 0.27kPa
09:00
10°C 11°C 15°C - 12% 0.49kPa
10:00
10°C 11°C 17°C - 21% 0.64kPa
11:00
10°C 11°C 18°C - 8% 0.77kPa
12:00
11°C 12°C 19°C - 6% 0.89kPa
13:00
11°C 12°C 19°C - 5% 0.96kPa
14:00
11°C 12°C 19°C - 5% 0.96kPa
15:00
11°C 13°C 19°C - 5% 0.93kPa
16:00
11°C 13°C 19°C - 5% 0.87kPa
17:00
11°C 13°C 18°C - 6% 0.78kPa
18:00
11°C 13°C 18°C - 5% 0.68kPa
19:00
11°C 13°C 17°C - 5% 0.6kPa
20:00
12°C 13°C 16°C - 6% 0.43kPa
21:00
12°C 13°C 14°C - 6% 0.24kPa
22:00 ☾
11°C 13°C 12°C - 5% 0.13kPa
23:00 ☾
10°C 13°C 11°C - 5% 0.1kPa
Tue, May 26 Sunrise 04:46 Sunset 21:42
24:00 ☾
9.9°C 13°C 11°C - 5% 0.08kPa
01:00 ☾
9.6°C 13°C 10°C - 5% 0.07kPa
02:00 ☾
9.3°C 12°C 10°C - 5% 0.06kPa
03:00 ☾
8.9°C 12°C 9.7°C - 5% 0.06kPa
04:00 ☾
8.3°C 12°C 9.2°C - 11% 0.07kPa
05:00
8°C 12°C 9.1°C - 55% 0.09kPa
06:00
8.5°C 12°C 10°C - 22% 0.15kPa
07:00
9.2°C 11°C 12°C - 40% 0.26kPa
08:00
9°C 12°C 14°C - 79% 0.46kPa
09:00
8.9°C 12°C 15°C - 69% 0.55kPa
10:00
8.6°C 12°C 16°C - 88% 0.74kPa
11:00
8.9°C 12°C 17°C - 47% 0.82kPa
12:00
9.6°C 12°C 19°C - 14% 1kPa
13:00
10°C 13°C 21°C - 15% 1.2kPa
14:00
11°C 13°C 21°C - 8% 1.2kPa
15:00
11°C 14°C 22°C - 20% 1.3kPa
16:00
11°C 14°C 22°C - 19% 1.3kPa
17:00
11°C 14°C 21°C - 43% 1.2kPa
18:00
13°C 15°C 20°C - 88% 0.83kPa
19:00
13°C 15°C 16°C - 56% 0.3kPa
20:00
11°C 14°C 13°C - 71% 0.23kPa
21:00
8.2°C 13°C 10°C - 85% 0.18kPa
22:00 ☾
5.6°C 13°C 7.6°C - 100% 0.14kPa
23:00 ☾
5.8°C 13°C 8.3°C - 78% 0.17kPa
Wed, May 27 Sunrise 04:45 Sunset 21:43
24:00 ☾
5.9°C 12°C 8.9°C - 57% 0.21kPa
01:00 ☾
6.1°C 12°C 9.6°C - 35% 0.25kPa
02:00 ☾
6.8°C 12°C 11°C - 31% 0.33kPa
03:00 ☾
7.5°C 12°C 13°C - 27% 0.42kPa
04:00 ☾
8.2°C 12°C 14°C - 22% 0.53kPa
05:00
8.9°C 12°C 15°C - 28% 0.6kPa
06:00
9.7°C 13°C 17°C - 34% 0.68kPa
07:00
11°C 13°C 18°C - 40% 0.77kPa
08:00
11°C 13°C 18°C - 46% 0.78kPa
09:00
12°C 13°C 19°C - 51% 0.8kPa
10:00
12°C 13°C 19°C - 57% 0.81kPa
11:00
12°C 14°C 19°C - 59% 0.71kPa
12:00
12°C 14°C 18°C - 61% 0.63kPa
13:00
12°C 14°C 17°C - 62% 0.54kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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