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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 68% failing

Currently

Real-time conditions
Soil Temperature7.9°C
Dew Point4.5°C (low dew point)
Wind Speed1.6m/s (calm conditions)
Cloud Cover1%

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 92 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
Wed, Apr 8
06:0048%2.5m/s
07:0048%2.5m/s
08:0048%2.3m/s
09:0052%1.6m/s
10:005%1.2m/s
11:004.8%1.4m/s
12:000%1.6m/s
13:000%1.9m/s
14:000%2m/s
15:000%2.3m/s
16:000%2m/s
17:000%2.3m/s
18:000%2.2m/s
19:000%2.2m/s
20:000%1.1m/s
21:000%0.79m/s
22:000%1.1m/s
23:000%1.3m/s
Thu, Apr 9
24:000%1.5m/s
01:000%1.7m/s
02:000%1.7m/s
03:003.3%1.6m/s
04:003.3%1.5m/s
05:003.3%1.4m/s
06:003.3%1.4m/s
07:0034%1.5m/s
08:0034%1.4m/s
09:005%0.45m/s
10:005%0.91m/s
11:000%1.7m/s
12:000%2m/s
13:000%2.3m/s
14:000%2.6m/s
15:000%2.9m/s
16:000%2.9m/s
17:000%3.1m/s
18:000%2.8m/s
19:000%2.4m/s
20:000%1.6m/s
21:000%1.1m/s
22:000%0.38m/s
23:000%0.54m/s
Fri, Apr 10
24:000%0.82m/s
01:000%1.6m/s
02:000%0.94m/s
03:000%0.44m/s
04:002.2%1.3m/s
05:002%0.35m/s
06:002%0.73m/s
07:002%0.33m/s
08:002.1%0.85m/s
09:003.1%0.54m/s
10:003.4%0.98m/s
11:003.4%1.9m/s
12:000%1.9m/s
13:000%2.2m/s
14:000%2.6m/s
15:000%2.4m/s
16:000%2.3m/s
17:000%2m/s
18:000%1.9m/s
19:000%1.8m/s
20:000%0.93m/s
21:000%0.95m/s
22:000%1.3m/s
23:000%1.9m/s
Sat, Apr 11
24:000%2.2m/s
01:000%2.2m/s
02:000%2.5m/s
03:000%2.7m/s
04:003.4%2.7m/s
05:004.9%2.5m/s
06:004.9%2.7m/s
07:004.7%2.8m/s
08:004.5%2.9m/s
09:003.9%2.8m/s
10:003.3%2.6m/s
11:002.9%2.5m/s
12:003.4%2.3m/s
13:003.4%2m/s
14:003.6%1.8m/s
15:003.2%1.9m/s
16:003.2%2m/s
17:0028%2.1m/s
18:0020%2m/s
19:0020%1.9m/s
20:0017%1.8m/s
21:0017%1.7m/s
22:0019%1.7m/s
23:0019%1.6m/s
Sun, Apr 12
24:0021%1.3m/s
01:0021%1m/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
Thu, Apr 9 Sunrise 06:57 Sunset 20:11
03:00
4.5°C 7.9°C 6.2°C - 1% 0.1kPa
04:00
4.3°C 7.4°C 5.9°C - 1% 0.1kPa
05:00
4.1°C 6.9°C 5.6°C - 1% 0.09kPa
06:00
3.8°C 6.5°C 5.2°C - 0% 0.08kPa
07:00
3.6°C 6°C 5°C - 0% 0.08kPa
08:00
4.6°C 5.7°C 6.3°C - 0% 0.1kPa
09:00
5.2°C 6.1°C 8.6°C - 0% 0.23kPa
10:00
3.6°C 6.9°C 10°C - 0% 0.44kPa
11:00
1.5°C 8.1°C 11°C - 0% 0.64kPa
12:00
0.9°C 9.2°C 12°C - 0% 0.74kPa
13:00
0.8°C 11°C 13°C - 0% 0.8kPa
14:00
1°C 12°C 13°C - 0% 0.84kPa
15:00
1.1°C 13°C 13°C - 1% 0.86kPa
16:00
1.1°C 14°C 13°C - 4% 0.87kPa
17:00
1.3°C 14°C 13°C - 5% 0.83kPa
18:00
1.9°C 14°C 13°C - 5% 0.75kPa
19:00
3.2°C 14°C 12°C - 4% 0.59kPa
20:00
4.6°C 13°C 9.3°C - 5% 0.32kPa
21:00
4.7°C 12°C 8.3°C - 8% 0.24kPa
22:00
4.9°C 12°C 7.8°C - 7% 0.19kPa
23:00
4.7°C 11°C 7.5°C - 5% 0.18kPa
Fri, Apr 10 Sunrise 06:57 Sunset 20:11
24:00
4.4°C 10°C 7.2°C - 4% 0.18kPa
01:00
4.1°C 9.6°C 7°C - 56% 0.18kPa
02:00
4°C 8.9°C 6.4°C - 8% 0.15kPa
03:00
3.9°C 8.4°C 5.8°C - 28% 0.11kPa
04:00
3.8°C 7.8°C 5.7°C - 76% 0.11kPa
05:00
3.7°C 7.3°C 5.4°C - 100% 0.1kPa
06:00
3.7°C 6.9°C 5.2°C - 100% 0.09kPa
07:00
3.6°C 6.4°C 5.1°C - 100% 0.09kPa
08:00
4.5°C 6.2°C 6.4°C - 100% 0.12kPa
09:00
4.7°C 6.4°C 7.7°C - 100% 0.2kPa
10:00
3.9°C 7.1°C 8.8°C - 100% 0.33kPa
11:00
2.3°C 7.9°C 9.7°C - 100% 0.48kPa
12:00
1.4°C 9°C 11°C - 100% 0.6kPa
13:00
1.5°C 10°C 11°C - 100% 0.64kPa
14:00
1.9°C 11°C 12°C - 100% 0.67kPa
15:00
1.8°C 12°C 12°C - 100% 0.69kPa
16:00
1.6°C 13°C 12°C - 100% 0.7kPa
17:00
1.5°C 13°C 12°C - 98% 0.69kPa
18:00
1.6°C 13°C 11°C - 96% 0.65kPa
19:00
2.5°C 13°C 11°C - 96% 0.55kPa
20:00
3.5°C 12°C 9°C - 100% 0.36kPa
21:00
3.1°C 12°C 8.2°C - 99% 0.32kPa
22:00
2.6°C 11°C 7.8°C - 100% 0.33kPa
23:00
2.2°C 10°C 7.7°C - 100% 0.34kPa
Sat, Apr 11 Sunrise 06:56 Sunset 20:12
24:00
2.1°C 9.7°C 7.4°C - 100% 0.32kPa
01:00
2°C 9.2°C 7.2°C - 100% 0.31kPa
02:00
1.7°C 8.7°C 7°C - 100% 0.31kPa
03:00
0.6°C 8.2°C 6.9°C - 100% 0.36kPa
04:00
-1.4°C 7.7°C 6.8°C - 95% 0.43kPa
05:00
-2.6°C 7.2°C 6.5°C - 5% 0.46kPa
06:00
-3.5°C 6.8°C 6.3°C - 5% 0.48kPa
07:00
-4.1°C 6.3°C 6.2°C - 5% 0.5kPa
08:00
-3.1°C 6.1°C 7.4°C - 0% 0.54kPa
09:00
-2.3°C 6.6°C 8.2°C - 33% 0.57kPa
10:00
-1.4°C 7.1°C 8.9°C - 66% 0.59kPa
11:00
-0.6°C 7.6°C 9.7°C - 99% 0.62kPa
12:00
0°C 7.5°C 9°C - 99% 0.53kPa
13:00
0.6°C 7.4°C 8.3°C - 100% 0.46kPa
14:00
1°C 7.3°C 7.6°C - 100% 0.38kPa
15:00
1.5°C 6.8°C 6.9°C - 100% 0.31kPa
16:00
1.9°C 6.4°C 6.2°C - 100% 0.25kPa
17:00
2.2°C 6°C 5.5°C - 100% 0.19kPa
18:00
2.5°C 5.6°C 5.1°C - 96% 0.15kPa
19:00
2.7°C 5.2°C 4.7°C - 92% 0.11kPa
20:00
2.9°C 4.9°C 4.3°C - 88% 0.08kPa
21:00
2.6°C 4.6°C 4°C - 92% 0.08kPa
22:00
2.2°C 4.3°C 3.6°C - 96% 0.08kPa
23:00
1.9°C 4°C 3.3°C - 100% 0.07kPa
Sun, Apr 12 Sunrise 06:54 Sunset 20:13
24:00
2°C 3.9°C 3.3°C - 100% 0.07kPa
01:00
2°C 3.7°C 3.3°C - 100% 0.07kPa
02:00
2.1°C 3.5°C 3.3°C - 100% 0.06kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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