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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 90% failing
Time Window 83% failing
Wind Speed 78% failing

Currently

Real-time conditions
Soil Temperature16.1°C
Dew Point8.8°C (moderate dew point)
Wind Speed3.2m/s (calm conditions)
Cloud Cover0%

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 80 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
Sun, May 24
06:000%2.2m/s
07:000%1.9m/s
08:000%0.68m/s
09:000%0.78m/s
10:000%1.6m/s
11:000%2m/s
12:000%2.4m/s
13:000%2.6m/s
14:000%3m/s
15:000%3.2m/s
16:000%3.1m/s
17:000%3.4m/s
18:000%3.3m/s
19:000%2.7m/s
20:000%1.8m/s
21:000%1.7m/s
22:000%2.2m/s
23:000%2.3m/s
Mon, May 25
24:000%2.2m/s
01:000%2.1m/s
02:000%1.9m/s
03:000%1.9m/s
04:000%1.9m/s
05:000%1.9m/s
06:000%1.9m/s
07:000%1.4m/s
08:000%0.19m/s
09:000%0.87m/s
10:000%1.6m/s
11:000%2m/s
12:000%2.3m/s
13:000%2.7m/s
14:000%2.9m/s
15:000%3m/s
16:000%2.8m/s
17:000%2.7m/s
18:000%2.2m/s
19:000%1.3m/s
20:000%1.2m/s
21:000%1.8m/s
22:000%2.3m/s
23:000%2.4m/s
Tue, May 26
24:000%2.3m/s
01:000%2.1m/s
02:000%2.1m/s
03:000%2.1m/s
04:000%2.2m/s
05:000%2.1m/s
06:000%2m/s
07:000%1.6m/s
08:000%0.31m/s
09:000%0.94m/s
10:000%1.4m/s
11:000%1.8m/s
12:000%2.2m/s
13:000%2.6m/s
14:000%2.9m/s
15:000%3m/s
16:000%2.8m/s
17:000%2.4m/s
18:000%1.7m/s
19:000%1.5m/s
20:000%0.99m/s
21:000%1m/s
22:004.5%1.1m/s
23:0061%1.2m/s
Wed, May 27
24:0061%1.3m/s
01:0061%1.4m/s
02:0061%1.5m/s
03:0070%1.6m/s
04:0066%1.7m/s
05:0061%1.8m/s
06:0046%2.1m/s
07:0046%2.5m/s
08:0041%2.8m/s
09:0041%2.8m/s
10:0044%2.9m/s
11:0044%2.9m/s
12:0031%2.6m/s
13:0026%2.3m/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/Zurich
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Sun, May 24 Sunrise 05:45 Sunset 21:06
15:00
8.8°C 16°C 25°C - 0% 2kPa
16:00
9.2°C 16°C 24°C - 2% 1.9kPa
17:00
9.8°C 17°C 24°C - 2% 1.8kPa
18:00
11°C 17°C 23°C - 0% 1.5kPa
19:00
13°C 17°C 22°C - 0% 1.1kPa
20:00
14°C 17°C 19°C - 0% 0.6kPa
21:00
13°C 17°C 16°C - 5% 0.3kPa
22:00
12°C 17°C 15°C - 5% 0.21kPa
23:00
12°C 17°C 14°C - 10% 0.2kPa
Mon, May 25 Sunrise 05:45 Sunset 21:06
24:00
11°C 16°C 14°C - 5% 0.25kPa
01:00
11°C 16°C 14°C - 5% 0.29kPa
02:00
10°C 16°C 13°C - 5% 0.31kPa
03:00
9.6°C 16°C 13°C - 5% 0.33kPa
04:00
9.1°C 16°C 13°C - 5% 0.35kPa
05:00
8.8°C 15°C 13°C - 7% 0.36kPa
06:00
8.5°C 15°C 13°C - 62% 0.37kPa
07:00
9.8°C 15°C 14°C - 42% 0.41kPa
08:00
11°C 15°C 17°C - 51% 0.66kPa
09:00
12°C 15°C 19°C - 27% 0.85kPa
10:00
12°C 15°C 21°C - 6% 1kPa
11:00
13°C 16°C 22°C - 7% 1.1kPa
12:00
13°C 16°C 23°C - 6% 1.3kPa
13:00
13°C 16°C 24°C - 12% 1.5kPa
14:00
13°C 17°C 24°C - 8% 1.6kPa
15:00
12°C 17°C 24°C - 15% 1.6kPa
16:00
12°C 17°C 24°C - 40% 1.6kPa
17:00
12°C 17°C 24°C - 62% 1.5kPa
18:00
13°C 18°C 23°C - 86% 1.3kPa
19:00
15°C 18°C 22°C - 69% 0.85kPa
20:00
15°C 18°C 20°C - 48% 0.59kPa
21:00
13°C 18°C 17°C - 62% 0.37kPa
22:00
13°C 17°C 15°C - 63% 0.28kPa
23:00
12°C 17°C 15°C - 94% 0.25kPa
Tue, May 26 Sunrise 05:44 Sunset 21:07
24:00
12°C 17°C 15°C - 90% 0.26kPa
01:00
11°C 17°C 14°C - 58% 0.3kPa
02:00
11°C 17°C 14°C - 48% 0.31kPa
03:00
11°C 17°C 14°C - 98% 0.29kPa
04:00
11°C 16°C 14°C - 92% 0.3kPa
05:00
11°C 16°C 14°C - 64% 0.29kPa
06:00
11°C 16°C 14°C - 27% 0.28kPa
07:00
12°C 16°C 15°C - 8% 0.33kPa
08:00
13°C 16°C 18°C - 4% 0.6kPa
09:00
13°C 16°C 20°C - 4% 0.87kPa
10:00
13°C 16°C 22°C - 3% 1.1kPa
11:00
13°C 16°C 23°C - 4% 1.3kPa
12:00
13°C 17°C 24°C - 3% 1.5kPa
13:00
12°C 17°C 25°C - 5% 1.7kPa
14:00
11°C 17°C 25°C - 6% 1.8kPa
15:00
11°C 18°C 25°C - 6% 1.9kPa
16:00
10°C 18°C 25°C - 18% 2kPa
17:00
10°C 18°C 25°C - 81% 1.9kPa
18:00
10°C 18°C 24°C - 27% 1.8kPa
19:00
14°C 18°C 23°C - 56% 1.3kPa
20:00
14°C 19°C 20°C - 57% 0.76kPa
21:00
11°C 13°C 15°C - 40% 0.47kPa
22:00
6.5°C 7.5°C 10°C - 23% 0.29kPa
23:00
2.5°C 2°C 5.4°C - 6% 0.16kPa
Wed, May 27 Sunrise 05:43 Sunset 21:08
24:00
3.7°C 1.9°C 6.5°C - 4% 0.17kPa
01:00
5°C 1.8°C 7.7°C - 3% 0.18kPa
02:00
6.2°C 1.7°C 8.9°C - 1% 0.19kPa
03:00
6.5°C 1.8°C 9.7°C - 16% 0.23kPa
04:00
6.8°C 1.8°C 10°C - 32% 0.28kPa
05:00
7.1°C 1.9°C 11°C - 47% 0.33kPa
06:00
7.3°C 2°C 11°C - 53% 0.33kPa
07:00
7.5°C 2.1°C 12°C - 59% 0.34kPa
08:00
7.7°C 2.3°C 12°C - 65% 0.35kPa
09:00
7.7°C 2.5°C 12°C - 61% 0.32kPa
10:00
7.7°C 2.7°C 11°C - 57% 0.3kPa
11:00
7.7°C 3°C 11°C - 54% 0.28kPa
12:00
7.6°C 3.1°C 10°C - 53% 0.22kPa
13:00
7.5°C 3.2°C 9.6°C - 52% 0.16kPa
14:00
7.3°C 3.3°C 8.8°C - 52% 0.11kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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