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Rule Morning Frost

Wengen - Morning Frost - Alps

Wengen, Bern, Switzerland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature-3.6°C
Dew Point-7.3°C (low dew point)
Wind Speed2.0m/s (calm conditions)
Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Moderate Frost
Wengen
Thu, Mar 19 · 05:48–06:00 · 1h window
Low confidence
35%
❄️Frost Probability76%
Soil Temperature: -3.7°C
Dew Point: -9.6°C (low dew point)
Wind Speed: 1.5m/s (calm conditions)
Cloud Cover: 31%
thermometer-snow weather icon
Moderate Frost at Sunrise
Wengen
Thu, Mar 19 · 06:00–08:00
❄️Frost Probability:67-73%
Low
thermometer-snow weather icon
Light Frost
Wengen
Fri, Mar 20 · 05:46–06:00
❄️Frost Probability:67%
Low
thermometer-snow weather icon
Light Frost at Sunrise
Wengen
Fri, Mar 20 · 06:00–08:00
❄️Frost Probability:61%
Low
thermometer-snow weather icon
Light Frost
Wengen
Fri, Mar 20 · 08:00–08:01
❄️Frost Probability:61%
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
Wed, Mar 11
08:0058%1.6m/s
09:0056%1.8m/s
10:0056%1.9m/s
11:0058%1.6m/s
12:0056%2m/s
13:0056%1.7m/s
14:0058%1.6m/s
15:0056%1.8m/s
16:0056%1.8m/s
17:0058%1.6m/s
18:0058%1.5m/s
19:0054%1.3m/s
20:0058%1.4m/s
21:0058%1.5m/s
22:0054%1m/s
23:0054%1.2m/s
Thu, Mar 12
24:0052%1.9m/s
01:0052%2.3m/s
02:0050%2.9m/s
03:0050%3.5m/s
04:0050%3.5m/s
05:0050%3m/s
06:0052%2.8m/s
07:0052%2.3m/s
08:0052%2m/s
09:0058%1.4m/s
10:0070%0.99m/s
11:0069%1.2m/s
12:0072%0.61m/s
13:0072%0.63m/s
14:0072%0.65m/s
15:0059%1.1m/s
16:0070%0.91m/s
17:0065%1.5m/s
18:0069%0.97m/s
19:0075%0.34m/s
20:0073%1.2m/s
21:0081%1.1m/s
22:0088%1.3m/s
23:0088%1.7m/s
Fri, Mar 13
24:0088%1.5m/s
01:0088%1.5m/s
02:0088%1.5m/s
03:0086%1.7m/s
04:0088%1.7m/s
05:0086%1.8m/s
06:0086%1.8m/s
07:0086%1.8m/s
08:0086%1.8m/s
09:0086%1.8m/s
10:0091%1.7m/s
11:0082%2.3m/s
12:0074%2.3m/s
13:0063%2.5m/s
14:0056%2.6m/s
15:0056%2.6m/s
16:0056%2.6m/s
17:0054%3.4m/s
18:0054%4m/s
19:0052%4.4m/s
20:0048%4.7m/s
21:0048%4.8m/s
22:0048%4.9m/s
23:0048%5m/s
Sat, Mar 14
24:0048%5m/s
01:0048%5.1m/s
02:0048%5.1m/s
03:0048%5.2m/s
04:0048%4.8m/s
05:0048%4.5m/s
06:0048%5.1m/s
07:0048%4.5m/s
08:0054%4m/s
09:0054%3.9m/s
10:0054%4.2m/s
11:0054%3.5m/s
12:0054%3.7m/s
13:0050%3.4m/s
14:0050%3m/s
15:0052%2.5m/s
16:0052%2.1m/s
17:0052%2.2m/s
18:0052%2.3m/s
19:0052%2.5m/s
20:0052%2.5m/s
21:0052%2.6m/s
22:0052%2.7m/s
23:0052%2.3m/s
Sun, Mar 15
24:0052%1.9m/s
01:0054%1.5m/s
02:0054%1.5m/s
03:0054%1.5m/s
04:0058%1.5m/s
05:0054%1.2m/s
06:0054%0.87m/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, Mar 12 Sunrise 06:47 Sunset 18:29
08:00
-7.3°C -3.6°C -6.6°C - 100% 0.02kPa
09:00
-7.5°C -3.6°C -5.9°C - 87% 0.05kPa
10:00
-8.6°C -3.6°C -5.5°C - 48% 0.08kPa
11:00
-7.4°C -3.6°C -4.5°C - 18% 0.08kPa
12:00
-7.6°C -3.6°C -4.2°C - 42% 0.1kPa
13:00
-6.9°C -3.5°C -3.7°C - 52% 0.1kPa
14:00
-6.5°C -3.5°C -3.3°C - 58% 0.1kPa
15:00
-5.5°C -3.5°C -2.9°C - 80% 0.09kPa
16:00
-6°C -3.5°C -2.9°C - 57% 0.1kPa
17:00
-5.1°C -3.4°C -2.7°C - 34% 0.08kPa
18:00
-7.3°C -3.4°C -6°C - 10% 0.04kPa
19:00
-9.4°C -3.4°C -8°C - 5% 0.03kPa
20:00
-9.7°C -3.5°C -8°C - 5% 0.04kPa
21:00
-12°C -3.5°C -8°C - 4% 0.09kPa
22:00
-15°C -3.5°C -7.9°C - 2% 0.15kPa
23:00
-17°C -3.6°C -7.6°C - 1% 0.18kPa
Fri, Mar 13 Sunrise 06:47 Sunset 18:29
24:00
-17°C -3.6°C -7.7°C - 4% 0.19kPa
01:00
-17°C -3.7°C -7.7°C - 5% 0.19kPa
02:00
-18°C -3.8°C -7.6°C - 5% 0.19kPa
03:00
-18°C -3.9°C -7.6°C - 5% 0.19kPa
04:00
-18°C -4°C -8°C - 5% 0.18kPa
05:00
-18°C -4.1°C -8°C - 7% 0.18kPa
06:00
-17°C -4.2°C -8.3°C - 6% 0.17kPa
07:00
-17°C -4.3°C -8.3°C - 7% 0.17kPa
08:00
-13°C -4.3°C -6.2°C - 8% 0.16kPa
09:00
-9.8°C -4.3°C -3°C - 6% 0.2kPa
10:00
-8.8°C -4.3°C -2.1°C - 6% 0.21kPa
11:00
-6.8°C -4.3°C -2°C - 8% 0.16kPa
12:00
-5.5°C -4.3°C -2.1°C - 38% 0.12kPa
13:00
-4.9°C -4.3°C -2.1°C - 28% 0.1kPa
14:00
-4.7°C -4.3°C -2.1°C - 100% 0.09kPa
15:00
-4.9°C -4.2°C -2.3°C - 94% 0.09kPa
16:00
-5.2°C -4.1°C -2.7°C - 100% 0.09kPa
17:00
-5.5°C -4°C -3.8°C - 100% 0.05kPa
18:00
-6.8°C -4°C -5.6°C - 100% 0.04kPa
19:00
-7.3°C -4.1°C -6.2°C - 100% 0.03kPa
20:00
-7°C -4.1°C -6.1°C - 100% 0.02kPa
21:00
-6.7°C -4.1°C -5.8°C - 100% 0.02kPa
22:00
-6.7°C -4.1°C -5.9°C - 100% 0.02kPa
23:00
-6.2°C -4.1°C -5.5°C - 100% 0.02kPa
Sat, Mar 14 Sunrise 06:45 Sunset 18:30
24:00
-6.1°C -4.1°C -5.4°C - 100% 0.02kPa
01:00
-6.3°C -4.1°C -5.5°C - 100% 0.02kPa
02:00
-6.5°C -4.1°C -5.7°C - 100% 0.02kPa
03:00
-6.6°C -4.1°C -5.8°C - 100% 0.02kPa
04:00
-6.7°C -4.1°C -5.8°C - 100% 0.03kPa
05:00
-6.8°C -4.1°C -5.9°C - 100% 0.03kPa
06:00
-6.8°C -4.1°C -5.9°C - 100% 0.03kPa
07:00
-6.6°C -4.1°C -5.9°C - 100% 0.02kPa
08:00
-6.9°C -4.1°C -5.8°C - 98% 0.03kPa
09:00
-6.3°C -4.1°C -5°C - 95% 0.04kPa
10:00
-5.7°C -4.1°C -4.1°C - 98% 0.05kPa
11:00
-5.2°C -4.1°C -3.7°C - 100% 0.05kPa
12:00
-5.2°C -4.1°C -3.9°C - 100% 0.04kPa
13:00
-5.2°C -4°C -4.3°C - 100% 0.03kPa
14:00
-6.7°C -3.9°C -6°C - 100% 0.02kPa
15:00
-8.3°C -3.8°C -7.7°C - 100% 0.02kPa
16:00
-9.8°C -3.7°C -9.4°C - 100% 0.01kPa
17:00
-10°C -3.7°C -9.8°C - 100% 0.01kPa
18:00
-11°C -3.7°C -10°C - 100% 0.01kPa
19:00
-11°C -3.8°C -10°C - 100% 0.01kPa
20:00
-11°C -3.8°C -11°C - 100% 0.01kPa
21:00
-12°C -3.8°C -11°C - 100% 0.01kPa
22:00
-12°C -3.8°C -12°C - 100% 0.01kPa
23:00
-12°C -3.8°C -11°C - 100% 0.01kPa
Sun, Mar 15 Sunrise 06:43 Sunset 18:32
24:00
-12°C -3.8°C -11°C - 100% 0.01kPa
01:00
-12°C -3.8°C -11°C - 100% 0.01kPa
02:00
-10°C -3.8°C -9.6°C - 100% 0.02kPa
03:00
-9.2°C -3.8°C -8.2°C - 100% 0.02kPa
04:00
-8°C -3.8°C -6.9°C - 100% 0.03kPa
05:00
-7°C -3.8°C -6.2°C - 100% 0.02kPa
06:00
-6.1°C -3.8°C -5.5°C - 100% 0.02kPa
07:00
-5.1°C -3.8°C -4.9°C - 100% 0.01kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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