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Rule Morning Frost

Verbier - Morning Frost - Alps

Verbier, Valais, Switzerland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature0.3°C
Dew Point-15.0°C (low dew point)
Wind Speed1.1m/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 Dawn
Verbier
Tomorrow · 06:36–07:00 · 1h window
Medium confidence
63%
❄️Frost Probability63%
Soil Temperature: 0.2°C
Dew Point: -6.5°C (low dew point)
Wind Speed: 0.1m/s (calm conditions)
Cloud Cover: 100%
thermometer-snow weather icon
Light Frost at Sunrise
Verbier
Tomorrow · 07:00–08:00
❄️Frost Probability:61%
Medium
thermometer-snow weather icon
Light Frost at Sunrise
Verbier
Thu, Feb 26 · 07:00–08:00
❄️Frost Probability:67%
Low
thermometer-snow weather icon
Light Frost (radiative)
Verbier
Thu, Feb 26 · 08:00–08:45
❄️Frost Probability:67%
Low
thermometer-snow weather icon
Moderate Frost
Verbier
Fri, Feb 27 · 08:00–08:44
❄️Frost Probability:76%
Low
thermometer-snow weather icon
Light Frost at Sunrise
Verbier
Sat, Feb 28 · 06:27–08:00
❄️Frost Probability:64%
Low
thermometer-snow weather icon
Light Frost
Verbier
Sat, Feb 28 · 08:00–08:42
❄️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
2matching hours in the next 95 hoursJump to next match
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
20:0077%1.7m/s
21:0077%1.9m/s
22:0081%1.9m/s
23:0081%2.1m/s
Sun, Feb 22
24:0086%2.2m/s
01:0084%2m/s
02:0084%2m/s
03:0084%1.9m/s
04:0084%1.7m/s
05:0084%1.9m/s
06:0084%1.9m/s
07:0069%1.9m/s
08:0086%1.6m/s
09:0088%0.91m/s
10:0067%0.29m/s
11:0062%0.39m/s
12:0059%0.65m/s
13:0059%0.73m/s
14:0054%0.85m/s
15:0053%1.1m/s
16:0058%0.35m/s
17:0075%0.25m/s
18:0071%1.4m/s
19:0071%1.3m/s
20:0071%1.1m/s
21:0071%1.3m/s
22:0073%1.4m/s
23:0073%1.4m/s
Mon, Feb 23
24:0073%1.1m/s
01:0070%0.7m/s
02:0068%1.1m/s
03:0066%0.56m/s
04:0066%0.64m/s
05:0055%0.54m/s
06:0063%0.14m/s
07:0061%1.3m/s
08:0053%0.89m/s
09:0053%1.7m/s
10:0047%1.7m/s
11:0047%2.5m/s
12:0045%3.1m/s
13:0045%3.6m/s
14:0045%3m/s
15:0045%3.6m/s
16:0045%3.2m/s
17:0047%2.5m/s
18:0047%2.8m/s
19:0047%2.3m/s
20:0048%2.3m/s
21:0048%2.5m/s
22:0054%1.9m/s
23:0062%1.8m/s
Tue, Feb 24
24:0062%1.8m/s
01:0066%1.8m/s
02:0077%1.8m/s
03:0077%1.7m/s
04:0074%1.9m/s
05:0074%1.8m/s
06:0074%1.8m/s
07:0066%1.9m/s
08:0066%1.9m/s
09:0071%1.6m/s
10:0066%1.9m/s
11:0062%1.8m/s
12:0053%1.6m/s
13:0050%1.4m/s
14:0050%1.1m/s
15:0053%1.3m/s
16:0064%1.2m/s
17:0079%1.1m/s
18:0077%1.7m/s
19:0084%2.9m/s
20:0084%3.2m/s
21:0084%3.5m/s
22:0084%3.9m/s
23:0082%4.4m/s
Wed, Feb 25
24:0082%4.6m/s
01:0073%4.7m/s
02:0075%3.8m/s
03:0067%2.9m/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 07:22 Sunset 18:06
20:00
-15°C 0.26°C -3.8°C - 100% 0.27kPa
21:00
-14°C 0.25°C -4.1°C - 100% 0.25kPa
22:00
-14°C 0.24°C -4.3°C - 98% 0.24kPa
23:00
-14°C 0.23°C -4.6°C - 100% 0.22kPa
Mon, Feb 23 Sunrise 07:22 Sunset 18:06
24:00
-13°C 0.21°C -4.7°C - 100% 0.21kPa
01:00
-12°C 0.21°C -4.8°C - 100% 0.19kPa
02:00
-11°C 0.21°C -4.8°C - 100% 0.17kPa
03:00
-11°C 0.21°C -4.9°C - 100% 0.15kPa
04:00
-7.8°C 0.19°C -3.6°C - 100% 0.13kPa
05:00
-6.7°C 0.19°C -3.7°C - 100% 0.09kPa
06:00
-6.5°C 0.18°C -3.4°C - 100% 0.1kPa
07:00
-7.2°C 0.19°C -4.1°C - 100% 0.09kPa
08:00
-6.6°C 0.19°C -5°C - 99% 0.05kPa
09:00
-4.5°C 0.19°C -3.5°C - 81% 0.03kPa
10:00
-2.9°C 0.2°C -2.4°C - 86% 0.02kPa
11:00
-1.8°C 0.22°C -1.5°C - 91% 0.01kPa
12:00
-1°C 0.24°C -0.69°C - 95% 0.01kPa
13:00
-0.8°C 0.26°C -0.65°C - 100% 0.01kPa
14:00
-0.8°C 0.28°C -0.6°C - 97% 0.01kPa
15:00
-1.8°C 0.29°C -1.5°C - 100% 0.01kPa
16:00
-1.4°C 0.31°C -1.1°C - 98% 0.01kPa
17:00
-1.6°C 0.33°C -1.4°C - 88% 0.01kPa
18:00
-3.4°C 0.32°C -2.6°C - 90% 0.03kPa
19:00
-3.3°C 0.32°C -2.8°C - 81% 0.02kPa
20:00
-4.4°C 0.32°C -4°C - 76% 0.01kPa
21:00
-4.5°C 0.32°C -4°C - 74% 0.02kPa
22:00
-4.9°C 0.31°C -4.3°C - 40% 0.02kPa
23:00
-7.4°C 0.31°C -6.3°C - 21% 0.03kPa
Tue, Feb 24 Sunrise 07:21 Sunset 18:08
24:00
-7.9°C 0.3°C -6.5°C - 21% 0.04kPa
01:00
-8.1°C 0.3°C -6°C - 5% 0.06kPa
02:00
-9.4°C 0.29°C -5.5°C - 5% 0.11kPa
03:00
-9.6°C 0.27°C -5.2°C - 5% 0.12kPa
04:00
-8.8°C 0.27°C -5.1°C - 5% 0.1kPa
05:00
-7.9°C 0.26°C -4.7°C - 5% 0.1kPa
06:00
-7.6°C 0.25°C -4.6°C - 5% 0.09kPa
07:00
-7.4°C 0.23°C -4.5°C - 5% 0.09kPa
08:00
-6.4°C 0.22°C -3.4°C - 5% 0.1kPa
09:00
-3.5°C 0.21°C -0.57°C - 5% 0.11kPa
10:00
-1°C 0.21°C 0.47°C - 6% 0.06kPa
11:00
-0.1°C 0.23°C 0.87°C - 8% 0.04kPa
12:00
0.9°C 0.26°C 1.6°C - 60% 0.03kPa
13:00
0.9°C 0.32°C 1.6°C - 64% 0.03kPa
14:00
0.4°C 0.36°C 1°C - 63% 0.03kPa
15:00
0.5°C 0.4°C 1.1°C - 56% 0.03kPa
16:00
0.3°C 0.42°C 1.3°C - 8% 0.04kPa
17:00
-1.6°C 0.43°C 1.5°C - 2% 0.13kPa
18:00
-6.3°C 0.42°C -0.83°C - 5% 0.19kPa
19:00
-8.2°C 0.4°C -1.5°C - 4% 0.22kPa
20:00
-9°C 0.39°C -0.93°C - 3% 0.26kPa
21:00
-9.1°C 0.37°C -0.72°C - 0% 0.27kPa
22:00
-8.8°C 0.36°C -0.81°C - 0% 0.26kPa
23:00
-8.2°C 0.35°C -0.89°C - 0% 0.24kPa
Wed, Feb 25 Sunrise 07:19 Sunset 18:09
24:00
-7.6°C 0.33°C -0.99°C - 0% 0.22kPa
01:00
-7°C 0.33°C -1.1°C - 0% 0.2kPa
02:00
-3.8°C 0.27°C 0.24°C - 4% 0.16kPa
03:00
-0.7°C 0.21°C 1.6°C - 7% 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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