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Rule Morning Frost

Chamonix - Morning Frost - Alps

Chamonix, Auvergne-Rhône-Alpes, France

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature0.8°C
Dew Point-7.3°C (low dew point)
Wind Speed3.1m/s (calm conditions)
Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Light Frost at Sunrise
Chamonix
Thu, Feb 26 · 07:00–08:00 · 1h window
Low confidence
36%
❄️Frost Probability67%
Soil Temperature: 0.6°C
Dew Point: 2.0°C (low dew point)
Wind Speed: 1.5m/s (calm conditions)
Cloud Cover: 25%
thermometer-snow weather icon
Light Frost (radiative)
Chamonix
Thu, Feb 26 · 08:00–08:47
❄️Frost Probability:67%
Low
thermometer-snow weather icon
Moderate Frost
Chamonix
Fri, Feb 27 · 08:00–08:45
❄️Frost Probability:76%
Low
thermometer-snow weather icon
Light Frost at Sunrise
Chamonix
Sat, Feb 28 · 06:28–08:00
❄️Frost Probability:64%
Low
thermometer-snow weather icon
Light Frost
Chamonix
Sat, Feb 28 · 08:00–08:43
❄️Frost Probability:64%
Low

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 95 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, Feb 21
20:0072%3.1m/s
21:0075%3.2m/s
22:0075%3.4m/s
23:0075%3.6m/s
Sun, Feb 22
24:0075%3.5m/s
01:0079%3.6m/s
02:0079%3.5m/s
03:0079%3.5m/s
04:0075%3.3m/s
05:0073%3.5m/s
06:0073%3.6m/s
07:0070%3.4m/s
08:0073%3.4m/s
09:0072%2.7m/s
10:0051%2.1m/s
11:0047%1.9m/s
12:0048%2.1m/s
13:0047%2.2m/s
14:0047%2.2m/s
15:0047%2.2m/s
16:0047%2.5m/s
17:0062%2.7m/s
18:0060%3m/s
19:0069%3.2m/s
20:0069%3.1m/s
21:0069%3.1m/s
22:0060%3.3m/s
23:0060%3.1m/s
Mon, Feb 23
24:0060%2.9m/s
01:0060%2.9m/s
02:0062%2.6m/s
03:0062%2.5m/s
04:0056%1.7m/s
05:0051%1.9m/s
06:0053%1.2m/s
07:0053%1.2m/s
08:0051%1.8m/s
09:0057%1.5m/s
10:0049%1.2m/s
11:0049%0.9m/s
12:0047%1.9m/s
13:0051%0.11m/s
14:0049%1.4m/s
15:0049%1.1m/s
16:0049%1.5m/s
17:0049%1.3m/s
18:0047%2m/s
19:0047%1.8m/s
20:0047%2m/s
21:0048%1.9m/s
22:0050%1.5m/s
23:0062%2.3m/s
Tue, Feb 24
24:0064%3.2m/s
01:0064%3.4m/s
02:0064%3.2m/s
03:0075%3m/s
04:0064%3.1m/s
05:0060%3.3m/s
06:0060%3.2m/s
07:0075%3.3m/s
08:0075%3.2m/s
09:0066%2.6m/s
10:0058%2.5m/s
11:0047%2.4m/s
12:0047%2m/s
13:0047%2m/s
14:0047%2.3m/s
15:0047%2.6m/s
16:0051%2.7m/s
17:0054%2.2m/s
18:0077%2.5m/s
19:0075%3m/s
20:0080%3.1m/s
21:0080%3.1m/s
22:0080%3.1m/s
23:0080%3.2m/s
Wed, Feb 25
24:0080%3.2m/s
01:0080%3.2m/s
02:0075%2.8m/s
03:0069%2.4m/s
04:0058%2m/s
05:0054%2.1m/s
06:0048%2.1m/s
07:0047%2.2m/s
08:0047%2.2m/s
09:0047%2.2m/s
10:0047%2.3m/s
11:0052%2.5m/s
12:0052%2.8m/s
13:0061%3m/s
14:0061%3.1m/s
15:0060%3.2m/s
16:0060%3.3m/s
17:0060%3.3m/s
18:0060%3.3m/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, Feb 22 Sunrise 07:24 Sunset 18:08
20:00
-7.3°C 0.84°C -0.89°C - 100% 0.22kPa
21:00
-7.2°C 0.82°C -1°C - 100% 0.21kPa
22:00
-6.9°C 0.82°C -1.1°C - 100% 0.2kPa
23:00
-6.3°C 0.81°C -1.3°C - 100% 0.17kPa
Mon, Feb 23 Sunrise 07:24 Sunset 18:08
24:00
-5.9°C 0.8°C -1.5°C - 100% 0.15kPa
01:00
-5.6°C 0.79°C -1.6°C - 100% 0.14kPa
02:00
-4.9°C 0.78°C -1.2°C - 100% 0.13kPa
03:00
-4.9°C 0.78°C -1.4°C - 100% 0.13kPa
04:00
-3.2°C 0.78°C -0.25°C - 100% 0.12kPa
05:00
-2.3°C 0.77°C -0.08°C - 100% 0.09kPa
06:00
-2.1°C 0.77°C 0.11°C - 100% 0.09kPa
07:00
-1.8°C 0.77°C -0.15°C - 100% 0.07kPa
08:00
-1.2°C 0.77°C 0.26°C - 100% 0.06kPa
09:00
-0.7°C 0.78°C 0.46°C - 59% 0.05kPa
10:00
0.8°C 0.78°C 0.83°C - 98% 0kPa
11:00
1.5°C 0.78°C 1.6°C - 96% 0kPa
12:00
1.7°C 0.79°C 1.8°C - 100% 0kPa
13:00
1.6°C 0.81°C 1.7°C - 100% 0kPa
14:00
1.9°C 0.83°C 2°C - 96% 0kPa
15:00
1.7°C 0.85°C 1.8°C - 98% 0kPa
16:00
1.3°C 0.87°C 1.3°C - 99% 0kPa
17:00
0.8°C 0.9°C 0.85°C - 99% 0kPa
18:00
-0.3°C 0.92°C -0.16°C - 99% 0.01kPa
19:00
-0.8°C 0.92°C -0.58°C - 99% 0.01kPa
20:00
-1.2°C 0.91°C -1.1°C - 95% 0.01kPa
21:00
-0.8°C 0.91°C -0.63°C - 76% 0.01kPa
22:00
-0.8°C 0.92°C -0.17°C - 63% 0.03kPa
23:00
-3.7°C 0.93°C -1.7°C - 17% 0.07kPa
Tue, Feb 24 Sunrise 07:22 Sunset 18:10
24:00
-5.5°C 0.93°C -2.9°C - 7% 0.09kPa
01:00
-5.1°C 0.93°C -2.7°C - 6% 0.08kPa
02:00
-5.2°C 0.93°C -2.5°C - 5% 0.09kPa
03:00
-6.3°C 0.93°C -2.5°C - 5% 0.13kPa
04:00
-7.1°C 0.93°C -2.5°C - 59% 0.15kPa
05:00
-6.9°C 0.93°C -2.3°C - 99% 0.15kPa
06:00
-5°C 0.93°C -0.96°C - 90% 0.15kPa
07:00
-4.6°C 0.93°C -0.89°C - 5% 0.14kPa
08:00
-4.3°C 0.93°C -0.53°C - 5% 0.14kPa
09:00
-0.2°C 0.92°C 1.9°C - 5% 0.1kPa
10:00
2.4°C 0.92°C 2.5°C - 19% 0.01kPa
11:00
3°C 0.92°C 3.2°C - 81% 0.01kPa
12:00
3.7°C 0.92°C 3.9°C - 96% 0.01kPa
13:00
3.2°C 0.92°C 3.4°C - 96% 0.01kPa
14:00
2.6°C 0.92°C 2.8°C - 96% 0.01kPa
15:00
2.5°C 0.92°C 2.7°C - 96% 0.01kPa
16:00
2.4°C 0.92°C 2.5°C - 53% 0.01kPa
17:00
2.5°C 0.92°C 3.3°C - 30% 0.04kPa
18:00
-0.7°C 0.91°C 2.4°C - 8% 0.14kPa
19:00
-3.4°C 0.91°C 1.2°C - 5% 0.19kPa
20:00
-4°C 0.91°C 1.1°C - 5% 0.21kPa
21:00
-4.5°C 0.91°C 1.1°C - 5% 0.22kPa
22:00
-4.7°C 0.91°C 1.1°C - 0% 0.23kPa
23:00
-4.7°C 0.91°C 1.2°C - 0% 0.23kPa
Wed, Feb 25 Sunrise 07:20 Sunset 18:11
24:00
-4.6°C 0.91°C 1.3°C - 1% 0.24kPa
01:00
-4.5°C 0.91°C 1.4°C - 4% 0.24kPa
02:00
-2.1°C 0.66°C 1.9°C - 6% 0.18kPa
03:00
0.1°C 0.4°C 2.4°C - 8% 0.11kPa
04:00
2.2°C 0.15°C 3°C - 11% 0.04kPa
05:00
2.4°C 0.32°C 3.2°C - 37% 0.04kPa
06:00
2.7°C 0.5°C 3.5°C - 62% 0.04kPa
07:00
3°C 0.67°C 3.8°C - 88% 0.04kPa
08:00
2.6°C 0.77°C 3.3°C - 86% 0.04kPa
09:00
2.2°C 0.87°C 2.9°C - 83% 0.04kPa
10:00
1.9°C 0.97°C 2.5°C - 81% 0.03kPa
11:00
0.1°C 0.92°C 1.5°C - 76% 0.07kPa
12:00
-1.8°C 0.86°C 0.57°C - 71% 0.1kPa
13:00
-3.7°C 0.81°C -0.39°C - 66% 0.13kPa
14:00
-3.8°C 0.73°C -0.37°C - 77% 0.13kPa
15:00
-3.9°C 0.65°C -0.35°C - 89% 0.14kPa
16:00
-4°C 0.57°C -0.34°C - 100% 0.14kPa
17:00
-4.5°C 0.51°C -0.69°C - 94% 0.14kPa
18:00
-5°C 0.45°C -1°C - 89% 0.15kPa
19:00
-5.5°C 0.39°C -1.4°C - 84% 0.15kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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