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Rule Morning Frost

Interlaken - Morning Frost - Alps

Interlaken, Bern, Switzerland

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 Temperature14.9°C
Dew Point10.7°C (moderate dew point)
Wind Speed0.3m/s (calm conditions)
Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich

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 spectacular frost photography opportunities in the Alps. We combine temperature, dewpoint, humidity, and wind data to predict when hoar frost will transform Alpine landscapes into crystalline wonderlands.

The European Alps offer frost photography opportunities from valley floors to high peaks. Clear, calm nights following periods of humidity create heavy hoar frost deposits that coat everything in ice crystals. Alpine waterfalls freeze into spectacular ice sculptures, traditional chalets become fairy-tale scenes, and frozen mountain lakes offer mirror-like surfaces reflecting frost-covered peaks.

What makes the Alps special for frost photography:

  • Alpine village charm - Traditional chalets and churches encrusted with hoar frost crystals
  • Frozen waterfalls - Spectacular ice formations at Lauterbrunnen and other waterfall locations
  • High-altitude frost - Matterhorn and other peaks develop dramatic rime ice formations
  • Frozen lakes - Alpine lakes freeze solid, creating pristine foregrounds for mountain photography

Zermatt's traditional wooden chalets become postcard-perfect when covered in thick hoar frost, with the Matterhorn rising behind. Lauterbrunnen's famous waterfalls partially freeze, creating dramatic ice curtains and pillars. High-altitude locations develop spectacular rime ice—the fine ice feathers that coat everything on exposed peaks. Frozen mountain lakes like those in St. Moritz's Engadin Valley become skating rinks with 4,000m peaks reflected in perfectly smooth ice. The car-free villages of Wengen and Mürren offer pristine frost scenes without modern intrusions. The key is timing—our forecast identifies clear, cold nights that produce heavy frost, and predicts morning conditions for photography before sun melts the formations.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 85 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/Zurich
Time Window
Sunrise -45m to +90m
Frost Probability
≥ 60.0%
Wind Speed
≤ 1.5m/s
Sat, Jun 13
07:000%1.8m/s
08:000%0.92m/s
09:000%0.75m/s
10:000%1.2m/s
11:000%1.6m/s
12:000%1.8m/s
13:000%2.3m/s
14:000%2.7m/s
15:000%2.9m/s
16:000%2.9m/s
17:000%2.6m/s
18:000%2.5m/s
19:000%1.7m/s
20:000%1m/s
21:000%0.25m/s
22:000%2m/s
23:000%2.4m/s
Sun, Jun 14
24:000%2.4m/s
01:000%2.4m/s
02:000%2.3m/s
03:000%2.4m/s
04:000%2.4m/s
05:000%2.3m/s
06:000%2.1m/s
07:000%1.9m/s
08:000%1.1m/s
09:000%0.98m/s
10:000%1.8m/s
11:000%1.8m/s
12:000%2.2m/s
13:000%2.9m/s
14:000%3.6m/s
15:000%3.7m/s
16:000%3.5m/s
17:000%3m/s
18:000%2.7m/s
19:000%2.6m/s
20:000%1.8m/s
21:000%0.72m/s
22:000%1.4m/s
23:000%2m/s
Mon, Jun 15
24:000%1.9m/s
01:000%2m/s
02:000%1.7m/s
03:000%1.8m/s
04:000%1.9m/s
05:000%1.9m/s
06:000%1.8m/s
07:000%1.3m/s
08:000%0.47m/s
09:000%1.2m/s
10:000%1.8m/s
11:000%2.2m/s
12:000%2.6m/s
13:000%3.1m/s
14:000%3.3m/s
15:000%3.4m/s
16:000%3.4m/s
17:000%2.8m/s
18:000%2.7m/s
19:000%2.5m/s
20:000%1.8m/s
21:000%1.1m/s
22:000%1.7m/s
23:000%2m/s
Tue, Jun 16
24:000%1.9m/s
01:000%1.9m/s
02:000%1.7m/s
03:000%1.8m/s
04:003.4%1.9m/s
05:0039%2m/s
06:0041%2.4m/s
07:0040%2.9m/s
08:0043%3.3m/s
09:0046%3.4m/s
10:0046%3.6m/s
11:0046%3.7m/s
12:0044%3.3m/s
13:0041%3m/s
14:0043%2.6m/s
15:0041%2.1m/s
16:0046%1.7m/s
17:0050%1.2m/s
18:0043%1.3m/s
19:0045%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/Zurich
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Sat, Jun 13 Sunrise 05:34 Sunset 21:22
21:00
11°C 15°C 15°C - 100% 0.38kPa
22:00
9.6°C 15°C 13°C - 100% 0.34kPa
23:00
9°C 15°C 13°C - 52% 0.31kPa
Sun, Jun 14 Sunrise 05:34 Sunset 21:22
24:00
8.3°C 15°C 12°C - 88% 0.29kPa
01:00
7.6°C 14°C 12°C - 100% 0.32kPa
02:00
7°C 14°C 11°C - 100% 0.34kPa
03:00
6.7°C 14°C 11°C - 97% 0.33kPa
04:00
6.6°C 14°C 11°C - 100% 0.33kPa
05:00
6.5°C 14°C 11°C - 100% 0.32kPa
06:00
6.6°C 14°C 11°C - 100% 0.31kPa
07:00
7.7°C 13°C 12°C - 100% 0.37kPa
08:00
8.5°C 13°C 15°C - 100% 0.6kPa
09:00
7.9°C 14°C 17°C - 94% 0.9kPa
10:00
7°C 14°C 18°C - 80% 1.1kPa
11:00
6.7°C 14°C 20°C - 31% 1.3kPa
12:00
6.2°C 14°C 21°C - 61% 1.5kPa
13:00
5.8°C 15°C 22°C - 96% 1.6kPa
14:00
5.5°C 15°C 22°C - 38% 1.7kPa
15:00
5.5°C 15°C 22°C - 100% 1.8kPa
16:00
6°C 15°C 22°C - 100% 1.7kPa
17:00
6.4°C 16°C 21°C - 96% 1.6kPa
18:00
6.9°C 16°C 21°C - 16% 1.5kPa
19:00
8.7°C 16°C 20°C - 5% 1.2kPa
20:00
11°C 16°C 17°C - 1% 0.63kPa
21:00
9.7°C 16°C 13°C - 0% 0.33kPa
22:00
8.9°C 16°C 12°C - 0% 0.24kPa
23:00
8.5°C 15°C 11°C - 0% 0.2kPa
Mon, Jun 15 Sunrise 05:34 Sunset 21:23
24:00
8.1°C 15°C 10°C - 0% 0.18kPa
01:00
7.6°C 15°C 10°C - 0% 0.19kPa
02:00
7.1°C 15°C 9.6°C - 0% 0.19kPa
03:00
6.9°C 14°C 9.4°C - 0% 0.19kPa
04:00
6.6°C 14°C 9.2°C - 0% 0.19kPa
05:00
6.4°C 14°C 9.1°C - 2% 0.19kPa
06:00
6.3°C 14°C 9.1°C - 3% 0.2kPa
07:00
7.6°C 14°C 11°C - 4% 0.3kPa
08:00
7.9°C 14°C 14°C - 5% 0.53kPa
09:00
8.2°C 14°C 16°C - 4% 0.71kPa
10:00
7.6°C 14°C 17°C - 5% 0.9kPa
11:00
7.1°C 14°C 18°C - 5% 1.1kPa
12:00
6.6°C 14°C 19°C - 5% 1.2kPa
13:00
6.3°C 14°C 20°C - 6% 1.4kPa
14:00
6.1°C 15°C 20°C - 9% 1.4kPa
15:00
5.8°C 15°C 21°C - 14% 1.5kPa
16:00
5.6°C 15°C 21°C - 22% 1.5kPa
17:00
5.8°C 15°C 20°C - 29% 1.4kPa
18:00
6°C 15°C 19°C - 15% 1.3kPa
19:00
7.8°C 16°C 19°C - 8% 1.1kPa
20:00
9.9°C 16°C 16°C - 5% 0.62kPa
21:00
9.2°C 16°C 13°C - 5% 0.31kPa
22:00
8.4°C 15°C 11°C - 5% 0.21kPa
23:00
8.2°C 15°C 10°C - 5% 0.18kPa
Tue, Jun 16 Sunrise 05:34 Sunset 21:23
24:00
7.6°C 15°C 10°C - 41% 0.18kPa
01:00
7.2°C 15°C 9.7°C - 100% 0.19kPa
02:00
6.7°C 14°C 9.9°C - 96% 0.23kPa
03:00
4.5°C 10°C 9.7°C - 97% 0.36kPa
04:00
2.1°C 6.5°C 9.6°C - 98% 0.48kPa
05:00
-0.8°C 2.6°C 9.5°C - 100% 0.61kPa
06:00
0.2°C 2.5°C 10°C - 82% 0.61kPa
07:00
1.1°C 2.5°C 11°C - 65% 0.61kPa
08:00
2.1°C 2.5°C 11°C - 48% 0.62kPa
09:00
2.6°C 2.5°C 11°C - 46% 0.57kPa
10:00
3°C 2.6°C 11°C - 43% 0.53kPa
11:00
3.4°C 2.6°C 10°C - 41% 0.49kPa
12:00
3.6°C 2.7°C 9.4°C - 54% 0.39kPa
13:00
3.7°C 2.7°C 8.3°C - 66% 0.3kPa
14:00
3.7°C 2.8°C 7.3°C - 79% 0.22kPa
15:00
2.8°C 2.7°C 6.3°C - 58% 0.2kPa
16:00
2°C 2.6°C 5.3°C - 36% 0.19kPa
17:00
1.1°C 2.6°C 4.3°C - 15% 0.17kPa
18:00
0.4°C 2.5°C 4.3°C - 42% 0.2kPa
19:00
-0.3°C 2.4°C 4.3°C - 70% 0.23kPa
20:00
-1°C 2.4°C 4.3°C - 98% 0.26kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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