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Rule Morning Frost

Mürren - Morning Frost - Alps

Mürren, Bern, Switzerland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature-2.5°C
Dew Point-10.4°C (low dew point)
Wind Speed1.1m/s (calm conditions)
Cloud Cover2%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Heavy Frost (radiative) at Sunrise
Mürren
Today · 06:08–08:00 · 2h window
Medium confidence
51%
❄️Frost Probability91%
Soil Temperature: -2.9°C
Dew Point: -13.4°C (low dew point)
Wind Speed: 1.3m/s (calm conditions)
Cloud Cover: 4%
thermometer-snow weather icon
Heavy Frost (radiative)
Mürren
Today · 08:00–08:23
❄️Frost Probability:91%
Medium
thermometer-snow weather icon
Moderate Frost at Sunrise
Mürren
Sat, Apr 11 · 06:04–08:00
❄️Frost Probability:76-83%
Medium
thermometer-snow weather icon
Heavy Frost (radiative)
Mürren
Sat, Apr 11 · 08:00–08:19
❄️Frost Probability:93%
Medium
thermometer-snow weather icon
Heavy Frost (radiative)
Mürren
Fri, Apr 17 · 05:53–06:00
❄️Frost Probability:95%
Medium
thermometer-snow weather icon
Heavy Frost (radiative) at Sunrise
Mürren
Fri, Apr 17 · 06:00–08:00
❄️Frost Probability:93-95%
High
thermometer-snow weather icon
Heavy Frost (radiative)
Mürren
Fri, Apr 17 · 08:00–08:08
❄️Frost Probability:89%
Medium

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
6matching 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
Wed, Apr 8
03:0082%1.7m/s
04:0084%1.7m/s
05:0084%1.5m/s
06:0093%1.7m/s
07:0091%1.8m/s
08:0093%1.5m/s
09:0089%1.3m/s
10:0089%1.4m/s
11:0085%1.4m/s
12:0085%0.84m/s
13:0087%0.67m/s
14:0091%0.75m/s
15:0085%0.99m/s
16:0085%1.5m/s
17:0078%1.8m/s
18:0066%1.9m/s
19:0056%1.8m/s
20:0056%2.2m/s
21:0056%2m/s
22:0073%1.6m/s
23:0084%0.9m/s
Thu, Apr 9
24:0086%0.58m/s
01:0095%0.79m/s
02:0093%0.97m/s
03:0093%1.1m/s
04:0093%1.4m/s
05:0091%1.3m/s
06:0091%1.3m/s
07:0091%1.2m/s
08:0091%1.4m/s
09:0089%1.7m/s
10:0087%2.1m/s
11:0087%2.2m/s
12:0089%2.4m/s
13:0085%2.7m/s
14:0087%2.8m/s
15:0085%2.8m/s
16:0085%2.9m/s
17:0085%3.1m/s
18:0081%3.2m/s
19:0074%2.7m/s
20:0067%2.6m/s
21:0063%2.2m/s
22:0071%2.2m/s
23:0074%2.3m/s
Fri, Apr 10
24:0082%2m/s
01:0076%1.6m/s
02:0082%2.3m/s
03:0060%2.7m/s
04:0056%1.8m/s
05:0056%1.8m/s
06:0067%2.3m/s
07:0059%2.4m/s
08:0067%1.8m/s
09:0076%2.6m/s
10:0076%2.7m/s
11:0074%3m/s
12:0074%3m/s
13:0074%3.2m/s
14:0070%3.6m/s
15:0070%3.3m/s
16:0070%3.2m/s
17:0068%2.8m/s
18:0065%2.4m/s
19:0057%2.4m/s
20:0054%2.1m/s
21:0056%1.5m/s
22:0067%1.5m/s
23:0068%1.7m/s
Sat, Apr 11
24:0073%1.5m/s
01:0076%1.5m/s
02:0072%1.3m/s
03:0076%1.4m/s
04:0077%1.2m/s
05:0078%0.77m/s
06:0076%0.99m/s
07:0083%0.87m/s
08:0093%0.66m/s
09:0083%0.91m/s
10:0075%1.2m/s
11:0074%1.4m/s
12:0076%1.7m/s
13:0070%1.9m/s
14:0065%2.2m/s
15:0057%2.3m/s
16:0054%2.4m/s
17:0054%2.6m/s
18:0054%2.5m/s
19:0054%2.4m/s
20:0050%2.4m/s
21:0050%2.5m/s
22:0050%2.5m/s
23:0050%2.6m/s
Sun, Apr 12
24:0050%2.5m/s
01:0050%2.4m/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 06:53 Sunset 20:07
03:00
-10°C -2.5°C -1.1°C - 2% 0.29kPa
04:00
-11°C -2.6°C -1.4°C - 0% 0.29kPa
05:00
-12°C -2.7°C -1.6°C - 2% 0.3kPa
06:00
-13°C -2.9°C -1.8°C - 4% 0.32kPa
07:00
-14°C -3°C -2°C - 4% 0.32kPa
08:00
-12°C -3.1°C -0.4°C - 4% 0.35kPa
09:00
-8.2°C -3.1°C 2.5°C - 5% 0.4kPa
10:00
-6.3°C -3.1°C 3.7°C - 5% 0.42kPa
11:00
-5.8°C -3.1°C 4.3°C - 5% 0.44kPa
12:00
-4.9°C -2.9°C 4.8°C - 6% 0.44kPa
13:00
-3.6°C -2.6°C 5.2°C - 23% 0.42kPa
14:00
-2.5°C -2.5°C 5.4°C - 22% 0.39kPa
15:00
-1.9°C -2.3°C 5.4°C - 22% 0.36kPa
16:00
-1.7°C -2.2°C 5.1°C - 22% 0.34kPa
17:00
-1.5°C -2.1°C 4.7°C - 21% 0.3kPa
18:00
-0.9°C -2°C 3.9°C - 22% 0.24kPa
19:00
-0.3°C -2°C 2.7°C - 9% 0.14kPa
20:00
-2.4°C -2°C -0.17°C - 15% 0.09kPa
21:00
-3.3°C -2°C -0.73°C - 27% 0.1kPa
22:00
-3.8°C -2°C -1°C - 8% 0.1kPa
23:00
-4.1°C -2.1°C -1.1°C - 5% 0.11kPa
Fri, Apr 10 Sunrise 06:53 Sunset 20:07
24:00
-4.2°C -2.1°C -1.1°C - 3% 0.12kPa
01:00
-4.6°C -2.1°C -1.3°C - 28% 0.12kPa
02:00
-5.2°C -2.1°C -1.3°C - 9% 0.14kPa
03:00
-4.3°C -2.1°C -1.5°C - 58% 0.1kPa
04:00
-3.6°C -2.1°C -1.5°C - 92% 0.08kPa
05:00
-4.1°C -2.1°C -1.5°C - 100% 0.1kPa
06:00
-4.4°C -2.2°C -1.3°C - 100% 0.12kPa
07:00
-4.1°C -2.3°C -1.1°C - 85% 0.11kPa
08:00
-3.3°C -2.4°C 0.49°C - 100% 0.16kPa
09:00
-5.3°C -2.4°C 1.9°C - 100% 0.29kPa
10:00
-5.2°C -2.3°C 2.8°C - 100% 0.33kPa
11:00
-4.1°C -2.3°C 3.4°C - 100% 0.33kPa
12:00
-2.9°C -2.3°C 3.9°C - 100% 0.32kPa
13:00
-1.7°C -2.2°C 4.3°C - 100% 0.29kPa
14:00
-0.7°C -2.1°C 4.7°C - 89% 0.27kPa
15:00
-0.5°C -2°C 4.7°C - 99% 0.27kPa
16:00
-0.5°C -2°C 4.4°C - 100% 0.25kPa
17:00
-0.3°C -1.9°C 4°C - 100% 0.22kPa
18:00
-0.2°C -1.9°C 3.6°C - 100% 0.19kPa
19:00
0.2°C -1.8°C 2.8°C - 97% 0.13kPa
20:00
0.3°C -1.8°C 1.7°C - 97% 0.07kPa
21:00
-0.2°C -1.8°C 1.6°C - 86% 0.08kPa
22:00
-1.5°C -1.9°C 1.7°C - 82% 0.14kPa
23:00
-2.9°C -1.9°C 1.6°C - 77% 0.19kPa
Sat, Apr 11 Sunrise 06:51 Sunset 20:09
24:00
-4.2°C -1.9°C 0.99°C - 62% 0.21kPa
01:00
-5.3°C -1.9°C 0.29°C - 58% 0.21kPa
02:00
-5.9°C -1.9°C -0.007°C - 91% 0.22kPa
03:00
-6.1°C -1.9°C 0.26°C - 94% 0.24kPa
04:00
-6.7°C -1.9°C -0.23°C - 61% 0.23kPa
05:00
-7.5°C -1.9°C -0.24°C - 100% 0.25kPa
06:00
-8.1°C -1.9°C -0.34°C - 100% 0.26kPa
07:00
-8.8°C -1.9°C -0.42°C - 30% 0.28kPa
08:00
-6.8°C -1.9°C 1.7°C - 5% 0.32kPa
09:00
-5.4°C -1.7°C 3.4°C - 36% 0.37kPa
10:00
-4°C -1.4°C 5.2°C - 67% 0.43kPa
11:00
-2.6°C -1.2°C 6.9°C - 98% 0.49kPa
12:00
-1.6°C -1.2°C 5.6°C - 95% 0.36kPa
13:00
-0.9°C -1.2°C 4.2°C - 91% 0.25kPa
14:00
-0.5°C -1.1°C 2.9°C - 88% 0.16kPa
15:00
-0.3°C -1.2°C 2.4°C - 92% 0.13kPa
16:00
-0.1°C -1.2°C 2°C - 96% 0.1kPa
17:00
0°C -1.2°C 1.5°C - 100% 0.07kPa
18:00
-0.4°C -1.3°C 0.91°C - 95% 0.06kPa
19:00
-0.7°C -1.3°C 0.31°C - 91% 0.04kPa
20:00
-1.1°C -1.4°C -0.29°C - 86% 0.03kPa
21:00
-0.8°C -1.4°C -0.02°C - 91% 0.03kPa
22:00
-0.5°C -1.4°C 0.25°C - 95% 0.03kPa
23:00
-0.3°C -1.4°C 0.52°C - 100% 0.03kPa
Sun, Apr 12 Sunrise 06:49 Sunset 20:10
24:00
-0.3°C -1.5°C 0.41°C - 100% 0.03kPa
01:00
-0.3°C -1.5°C 0.31°C - 100% 0.03kPa
02:00
-0.4°C -1.5°C 0.21°C - 100% 0.02kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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