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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 83% failing
Wind Speed 54% failing

Currently

Real-time conditions
Soil Temperature11.3°C
Dew Point5.3°C (moderate dew point)
Wind Speed0.2m/s (calm conditions)
Cloud Cover73%

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 86 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, Apr 18
06:0020%1.8m/s
07:0021%2m/s
08:0023%1.4m/s
09:0038%0.54m/s
10:003.7%1.3m/s
11:004.9%1.7m/s
12:000%1.8m/s
13:000%1.8m/s
14:000%2.2m/s
15:000%2.6m/s
16:000%2.8m/s
17:000%2.6m/s
18:000%2.5m/s
19:000%2.2m/s
20:000%1.1m/s
21:000%0.17m/s
22:000%0.73m/s
23:000%1.2m/s
Sun, Apr 19
24:000%1.5m/s
01:000%1.8m/s
02:000%1.9m/s
03:000%1.6m/s
04:000%1.3m/s
05:002.1%1.2m/s
06:002.1%0.91m/s
07:003.2%2.1m/s
08:002.9%0.91m/s
09:003.4%1.1m/s
10:003.2%1.9m/s
11:003.8%0.77m/s
12:000%2.1m/s
13:000%2.3m/s
14:000%2.8m/s
15:000%2.8m/s
16:000%3m/s
17:000%3.4m/s
18:000%2.8m/s
19:000%2.7m/s
20:000%2.3m/s
21:000%1.2m/s
22:000%0.31m/s
23:000%0.12m/s
Mon, Apr 20
24:000%0.58m/s
01:000%0.83m/s
02:000%1.4m/s
03:001.5%1.3m/s
04:001.9%1.4m/s
05:002.2%1.2m/s
06:002.5%1m/s
07:002.9%0.86m/s
08:004.6%0.41m/s
09:004.9%0.86m/s
10:004.9%1.6m/s
11:000%2.1m/s
12:000%2.7m/s
13:000%3m/s
14:000%3.4m/s
15:000%3.7m/s
16:000%3.7m/s
17:000%3.3m/s
18:000%2.8m/s
19:000%2.4m/s
20:000%1.9m/s
21:000%1.2m/s
22:000%0.85m/s
23:000%0.53m/s
Tue, Apr 21
24:000%0.1m/s
01:000%0.35m/s
02:005%0.25m/s
03:0054%0.94m/s
04:0052%1.6m/s
05:0057%2.3m/s
06:0050%2.5m/s
07:0050%2.7m/s
08:0045%2.9m/s
09:0046%3m/s
10:0046%3.1m/s
11:0046%3.2m/s
12:0050%2.8m/s
13:0052%2.3m/s
14:0048%1.9m/s
15:0046%1.5m/s
16:0036%1.2m/s
17:0033%0.92m/s
18:0036%1.4m/s
19:0041%1.8m/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, Apr 18 Sunrise 06:41 Sunset 20:22
21:00
5.3°C 11°C 7.7°C - 73% 0.16kPa
22:00
4.9°C 11°C 7°C - 45% 0.14kPa
23:00
4.7°C 10°C 6.9°C - 100% 0.14kPa
Sun, Apr 19 Sunrise 06:41 Sunset 20:22
24:00
4.6°C 9.5°C 6.9°C - 100% 0.15kPa
01:00
4.9°C 9.1°C 6.9°C - 100% 0.13kPa
02:00
4.9°C 8.7°C 6.7°C - 100% 0.12kPa
03:00
4.5°C 8.4°C 6.8°C - 100% 0.15kPa
04:00
4.1°C 8.1°C 6.9°C - 100% 0.17kPa
05:00
4°C 7.9°C 6.6°C - 100% 0.16kPa
06:00
3.5°C 7.6°C 6.5°C - 100% 0.18kPa
07:00
3.1°C 7.4°C 6.6°C - 100% 0.22kPa
08:00
3.1°C 7.2°C 6.3°C - 100% 0.19kPa
09:00
1.4°C 7.2°C 7°C - 100% 0.33kPa
10:00
1.9°C 7.5°C 7.6°C - 100% 0.34kPa
11:00
1.6°C 8°C 8.6°C - 100% 0.43kPa
12:00
2.2°C 8.9°C 9.7°C - 4% 0.49kPa
13:00
3°C 10°C 11°C - 4% 0.51kPa
14:00
3.1°C 11°C 11°C - 0% 0.54kPa
15:00
2.8°C 12°C 11°C - 4% 0.57kPa
16:00
2.4°C 13°C 11°C - 91% 0.58kPa
17:00
2.7°C 13°C 10°C - 89% 0.52kPa
18:00
2.8°C 13°C 9.7°C - 51% 0.46kPa
19:00
3.3°C 13°C 9°C - 26% 0.38kPa
20:00
4.2°C 12°C 7.3°C - 36% 0.2kPa
21:00
4.6°C 12°C 5.7°C - 59% 0.07kPa
22:00
4.5°C 11°C 5.2°C - 42% 0.04kPa
23:00
4.3°C 10°C 4.8°C - 24% 0.03kPa
Mon, Apr 20 Sunrise 06:39 Sunset 20:24
24:00
3.9°C 9.4°C 4.4°C - 13% 0.03kPa
01:00
3.4°C 8.8°C 4.2°C - 14% 0.04kPa
02:00
3.1°C 8.2°C 4°C - 34% 0.05kPa
03:00
3°C 7.7°C 3.8°C - 73% 0.04kPa
04:00
2.5°C 7.5°C 4.4°C - 75% 0.1kPa
05:00
1.9°C 7.2°C 4.2°C - 78% 0.13kPa
06:00
1.3°C 7°C 4°C - 41% 0.14kPa
07:00
1°C 6.5°C 2.9°C - 11% 0.09kPa
08:00
0.7°C 6.3°C 3.9°C - 4% 0.16kPa
09:00
0.9°C 6.5°C 5.1°C - 3% 0.22kPa
10:00
0.6°C 7.2°C 6.5°C - 3% 0.32kPa
11:00
-0.2°C 8.1°C 7.7°C - 2% 0.44kPa
12:00
-0.4°C 9.2°C 8.6°C - 2% 0.53kPa
13:00
-0.3°C 10°C 9.4°C - 1% 0.58kPa
14:00
-0.3°C 11°C 9.7°C - 5% 0.6kPa
15:00
-0.6°C 12°C 9.8°C - 98% 0.63kPa
16:00
-1.3°C 13°C 9.4°C - 100% 0.62kPa
17:00
-2.2°C 13°C 8.9°C - 100% 0.62kPa
18:00
-2.9°C 13°C 8.3°C - 100% 0.6kPa
19:00
-2.5°C 12°C 7.5°C - 100% 0.53kPa
20:00
-1.8°C 12°C 6.3°C - 95% 0.42kPa
21:00
-1.5°C 11°C 5.1°C - 62% 0.33kPa
22:00
-1.3°C 10°C 4.5°C - 58% 0.29kPa
23:00
-1.5°C 9.6°C 4.1°C - 14% 0.27kPa
Tue, Apr 21 Sunrise 06:38 Sunset 20:25
24:00
-1.7°C 8.9°C 3.7°C - 9% 0.26kPa
01:00
-2°C 8.2°C 3.3°C - 5% 0.24kPa
02:00
-2.3°C 7.5°C 2.8°C - 5% 0.23kPa
03:00
-3.3°C 6°C 3.8°C - 4% 0.32kPa
04:00
-4.5°C 4.4°C 4.7°C - 3% 0.41kPa
05:00
-6°C 2.9°C 5.6°C - 2% 0.52kPa
06:00
-5.7°C 3.2°C 6.3°C - 2% 0.55kPa
07:00
-5.3°C 3.6°C 7°C - 2% 0.59kPa
08:00
-4.9°C 4°C 7.7°C - 2% 0.62kPa
09:00
-4.4°C 4.3°C 7.4°C - 3% 0.59kPa
10:00
-3.9°C 4.6°C 7.1°C - 3% 0.55kPa
11:00
-3.5°C 4.9°C 6.9°C - 4% 0.52kPa
12:00
-3.2°C 4.8°C 5.5°C - 3% 0.42kPa
13:00
-3.2°C 4.7°C 4.1°C - 3% 0.34kPa
14:00
-3.2°C 4.6°C 2.7°C - 3% 0.26kPa
15:00
-3.4°C 4.3°C 1.9°C - 22% 0.23kPa
16:00
-3.7°C 4°C 1.1°C - 41% 0.2kPa
17:00
-3.9°C 3.6°C 0.32°C - 61% 0.17kPa
18:00
-4.3°C 3.5°C 0.15°C - 41% 0.17kPa
19:00
-4.8°C 3.4°C -0.01°C - 21% 0.18kPa
20:00
-5.2°C 3.2°C -0.18°C - 1% 0.19kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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