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Rule Morning Frost

Chamonix - Morning Frost - Alps

Chamonix, Auvergne-Rhône-Alpes, France

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 88% failing
Wind Speed 74% failing

Currently

Real-time conditions
Soil Temperature16.2°C
Dew Point9.4°C (moderate dew point)
Wind Speed2.8m/s (calm conditions)
Cloud Cover8%

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%2.3m/s
07:000%2.2m/s
08:000%1.2m/s
09:000%0.19m/s
10:000%1.4m/s
11:000%1.8m/s
12:000%2.2m/s
13:000%2.6m/s
14:000%2.6m/s
15:000%2.8m/s
16:000%3.1m/s
17:000%2.6m/s
18:000%1.9m/s
19:000%1.7m/s
20:000%1.5m/s
21:000%1.9m/s
22:000%2.5m/s
23:000%2.3m/s
Mon, May 25
24:000%2m/s
01:000%1.8m/s
02:000%1.7m/s
03:000%1.9m/s
04:000%1.9m/s
05:000%1.7m/s
06:000%1.8m/s
07:000%1.9m/s
08:000%0.95m/s
09:000%0.2m/s
10:000%1m/s
11:000%1.5m/s
12:000%2.1m/s
13:000%2.5m/s
14:000%3.1m/s
15:000%3.6m/s
16:000%3.3m/s
17:000%2.5m/s
18:000%2m/s
19:000%1.5m/s
20:000%0.99m/s
21:000%0.25m/s
22:000%0.93m/s
23:000%1.5m/s
Tue, May 26
24:000%1.8m/s
01:000%1.9m/s
02:000%2m/s
03:000%2.2m/s
04:000%2.1m/s
05:000%2m/s
06:000%2m/s
07:000%1.8m/s
08:000%0.91m/s
09:000%0.39m/s
10:000%1.3m/s
11:000%1.7m/s
12:000%2.1m/s
13:000%2.4m/s
14:000%2.6m/s
15:000%3m/s
16:000%3.2m/s
17:000%2.5m/s
18:000%2.3m/s
19:000%2m/s
20:000%1.3m/s
21:000%1.3m/s
22:000%1.2m/s
23:000%1.2m/s
Wed, May 27
24:000%0.87m/s
01:000%0.58m/s
02:000%0.3m/s
03:000%0.91m/s
04:000%1.5m/s
05:000%2.1m/s
06:000%2.3m/s
07:000%2.5m/s
08:000%2.6m/s
09:000%2.5m/s
10:000%2.4m/s
11:000%2.4m/s
12:000%2.1m/s
13:000%1.9m/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 05:51 Sunset 21:07
15:00
9.4°C 16°C 20°C - 8% 1.1kPa
16:00
9.7°C 17°C 19°C - 14% 1kPa
17:00
10°C 17°C 19°C - 13% 0.9kPa
18:00
9.8°C 17°C 18°C - 80% 0.86kPa
19:00
10°C 17°C 18°C - 48% 0.81kPa
20:00
11°C 17°C 16°C - 32% 0.47kPa
21:00
9.8°C 17°C 13°C - 93% 0.3kPa
22:00
9.5°C 16°C 13°C - 90% 0.27kPa
23:00
8.8°C 16°C 12°C - 92% 0.31kPa
Mon, May 25 Sunrise 05:51 Sunset 21:07
24:00
8°C 15°C 12°C - 67% 0.36kPa
01:00
7.4°C 15°C 12°C - 9% 0.37kPa
02:00
6.8°C 14°C 12°C - 9% 0.37kPa
03:00
6.4°C 14°C 11°C - 5% 0.38kPa
04:00
6°C 13°C 11°C - 5% 0.39kPa
05:00
5.8°C 13°C 11°C - 5% 0.37kPa
06:00
5.5°C 13°C 11°C - 5% 0.37kPa
07:00
6.9°C 12°C 12°C - 5% 0.42kPa
08:00
7.4°C 12°C 15°C - 5% 0.65kPa
09:00
8.2°C 13°C 16°C - 5% 0.74kPa
10:00
8.9°C 13°C 17°C - 49% 0.84kPa
11:00
9.2°C 14°C 19°C - 5% 0.97kPa
12:00
9.2°C 15°C 20°C - 5% 1.1kPa
13:00
9.3°C 15°C 20°C - 90% 1.2kPa
14:00
9.5°C 16°C 21°C - 72% 1.3kPa
15:00
11°C 17°C 20°C - 44% 1.1kPa
16:00
11°C 17°C 19°C - 94% 0.93kPa
17:00
10°C 17°C 19°C - 97% 0.94kPa
18:00
9.6°C 17°C 19°C - 100% 0.93kPa
19:00
12°C 17°C 18°C - 100% 0.69kPa
20:00
12°C 17°C 17°C - 99% 0.48kPa
21:00
11°C 17°C 15°C - 100% 0.39kPa
22:00
9.9°C 16°C 14°C - 100% 0.33kPa
23:00
9.3°C 16°C 14°C - 100% 0.37kPa
Tue, May 26 Sunrise 05:51 Sunset 21:08
24:00
8.9°C 16°C 13°C - 100% 0.39kPa
01:00
8.3°C 15°C 13°C - 67% 0.39kPa
02:00
7.6°C 15°C 12°C - 32% 0.39kPa
03:00
7.3°C 14°C 12°C - 12% 0.41kPa
04:00
6.8°C 14°C 12°C - 5% 0.41kPa
05:00
6.4°C 13°C 12°C - 2% 0.42kPa
06:00
6.2°C 13°C 12°C - 0% 0.42kPa
07:00
7.8°C 13°C 13°C - 0% 0.46kPa
08:00
8.2°C 13°C 16°C - 3% 0.71kPa
09:00
8.4°C 13°C 17°C - 5% 0.84kPa
10:00
8.5°C 14°C 18°C - 4% 0.99kPa
11:00
8.3°C 14°C 19°C - 5% 1.1kPa
12:00
8.4°C 15°C 20°C - 5% 1.3kPa
13:00
8.7°C 16°C 21°C - 6% 1.3kPa
14:00
9°C 17°C 21°C - 9% 1.4kPa
15:00
9.6°C 17°C 21°C - 26% 1.3kPa
16:00
10°C 18°C 21°C - 43% 1.2kPa
17:00
11°C 18°C 20°C - 72% 1kPa
18:00
10°C 18°C 20°C - 93% 1.1kPa
19:00
11°C 18°C 19°C - 100% 0.97kPa
20:00
12°C 18°C 18°C - 100% 0.59kPa
21:00
11°C 15°C 15°C - 80% 0.4kPa
22:00
8.8°C 13°C 12°C - 61% 0.26kPa
23:00
6.9°C 9.7°C 9.1°C - 41% 0.16kPa
Wed, May 27 Sunrise 05:50 Sunset 21:09
24:00
7.7°C 9.5°C 10°C - 29% 0.2kPa
01:00
8.5°C 9.4°C 12°C - 17% 0.25kPa
02:00
9.3°C 9.2°C 13°C - 5% 0.3kPa
03:00
9.3°C 9.6°C 14°C - 8% 0.42kPa
04:00
9.1°C 10°C 15°C - 11% 0.55kPa
05:00
8.8°C 10°C 16°C - 14% 0.7kPa
06:00
8.5°C 11°C 17°C - 39% 0.8kPa
07:00
8.2°C 12°C 18°C - 65% 0.91kPa
08:00
7.8°C 12°C 18°C - 90% 1kPa
09:00
9°C 13°C 17°C - 69% 0.83kPa
10:00
9.9°C 13°C 16°C - 48% 0.65kPa
11:00
11°C 13°C 16°C - 26% 0.48kPa
12:00
11°C 13°C 15°C - 26% 0.42kPa
13:00
11°C 13°C 15°C - 26% 0.36kPa
14:00
11°C 13°C 14°C - 25% 0.3kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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