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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
Frost Probability
54%
Soil Temperature-1.9°C
Dew Point-0.2°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
Heavy Frost (radiative) at Dawn
Mürren
Wed, Apr 22 · 05:44–06:00 · 1h window
Medium confidence
48%
❄️Frost Probability87%
Soil Temperature: -1.6°C
Dew Point: -12.1°C (low dew point)
Wind Speed: 1.2m/s (calm conditions)
Cloud Cover: 0%
thermometer-snow weather icon
Heavy Frost (radiative) at Sunrise
Mürren
Wed, Apr 22 · 06:00–07:59
❄️Frost Probability:87%
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 86 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, Apr 18
06:00✓59%0.59m/s
07:00✓64%0.39m/s
08:00✓71%0.35m/s
09:00✕80%0.55m/s
10:00✕80%0.8m/s
11:00✕78%1.1m/s
12:00✕82%1.4m/s
13:00✕89%1.5m/s
14:00✕83%1.9m/s
15:00✕78%2.5m/s
16:00✕71%2.4m/s
17:00✕66%2.6m/s
18:00✕65%2.5m/s
19:00✕54%2.6m/s
20:00✕54%2.3m/s
21:00✕54%2m/s
22:00✕57%1.7m/s
23:00✕56%0.91m/s
Sun, Apr 19
24:00✕60%0.83m/s
01:00✕67%0.83m/s
02:00✕67%1.2m/s
03:00✕56%1.3m/s
04:00✕56%1.4m/s
05:00✓59%1.4m/s
06:00✓59%1.6m/s
07:00✓57%2.4m/s
08:00✓52%3.1m/s
09:00✕54%2.6m/s
10:00✕54%2.1m/s
11:00✕57%2.3m/s
12:00✕69%2.5m/s
13:00✕74%2.9m/s
14:00✕79%3.1m/s
15:00✕79%3.2m/s
16:00✕79%3.4m/s
17:00✕72%3.6m/s
18:00✕70%3.3m/s
19:00✕62%3.1m/s
20:00✕56%2.9m/s
21:00✕56%2.9m/s
22:00✕56%2.8m/s
23:00✕57%2.4m/s
Mon, Apr 20
24:00✕71%1.4m/s
01:00✕75%1.5m/s
02:00✕78%1.5m/s
03:00✕75%1.6m/s
04:00✕65%1.7m/s
05:00✓61%1.8m/s
06:00✓77%1.9m/s
07:00✓69%1.9m/s
08:00✓68%1.9m/s
09:00✕83%2.4m/s
10:00✕91%2.7m/s
11:00✕87%2.8m/s
12:00✕85%3m/s
13:00✕85%3.4m/s
14:00✕79%3.7m/s
15:00✕79%3.8m/s
16:00✕73%3.8m/s
17:00✕72%3.7m/s
18:00✕63%3.4m/s
19:00✕63%3.2m/s
20:00✕52%2.8m/s
21:00✕55%2.8m/s
22:00✕54%2.3m/s
23:00✕54%2.2m/s
Tue, Apr 21
24:00✕58%1.9m/s
01:00✕68%1.4m/s
02:00✕78%1.3m/s
03:00✕78%1.6m/s
04:00✕89%1.9m/s
05:00✓89%2.3m/s
06:00✓89%2.7m/s
07:00✓87%3.2m/s
08:00✓87%3.7m/s
09:00✕83%3.9m/s
10:00✕79%4m/s
11:00✕72%4.2m/s
12:00✕67%3.6m/s
13:00✕67%3.1m/s
14:00✕58%2.5m/s
15:00✕61%1.9m/s
16:00✕67%1.2m/s
17:00✕81%0.57m/s
18:00✕79%1.1m/s
19:00✕79%1.7m/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
Sat, Apr 18 Sunrise 06:36 Sunset 20:19
21:00 ☾
-0.2°C -1.9°C 1.1°C - 100% 0.06kPa
22:00 ☾
-0.8°C -1.9°C 0.85°C - 77% 0.07kPa
23:00 ☾
-1.6°C -1.9°C 0.38°C - 86% 0.08kPa
Sun, Apr 19 Sunrise 06:36 Sunset 20:19
24:00 ☾
-2.1°C -1.9°C 0.56°C - 70% 0.11kPa
01:00 ☾
-3.3°C -1.9°C -0.17°C - 94% 0.13kPa
02:00 ☾
-3.1°C -1.9°C -0.05°C - 99% 0.12kPa
03:00 ☾
-2.2°C -1.9°C 0.3°C - 100% 0.1kPa
04:00 ☾
-1.7°C -1.9°C 0.5°C - 100% 0.1kPa
05:00 ☾
-1.6°C -1.9°C 0.88°C - 100% 0.11kPa
06:00 ☾
-2°C -1.9°C 0.87°C - 100% 0.12kPa
07:00
-1.8°C -1.9°C 0.74°C - 99% 0.11kPa
08:00
-1°C -1.9°C 0.85°C - 93% 0.08kPa
09:00
-0.9°C -1.9°C 0.49°C - 100% 0.06kPa
10:00
-0.9°C -1.9°C 0.83°C - 100% 0.08kPa
11:00
-1.3°C -1.8°C 1.6°C - 100% 0.13kPa
12:00
-1.1°C -1.8°C 2°C - 57% 0.14kPa
13:00
-1°C -1.8°C 2.8°C - 25% 0.18kPa
14:00
-1.4°C -1.8°C 3.3°C - 23% 0.22kPa
15:00
-1.8°C -1.8°C 3.5°C - 22% 0.24kPa
16:00
-2°C -1.7°C 3.3°C - 23% 0.24kPa
17:00
-1.8°C -1.7°C 2.8°C - 56% 0.21kPa
18:00
-1.8°C -1.6°C 2°C - 34% 0.17kPa
19:00
-1.9°C -1.5°C 1°C - 36% 0.13kPa
20:00
-2.2°C -1.5°C -0.67°C - 45% 0.06kPa
21:00 ☾
-2.9°C -1.5°C -1.7°C - 50% 0.05kPa
22:00 ☾
-3.1°C -1.5°C -2°C - 49% 0.04kPa
23:00 ☾
-3.5°C -1.5°C -2.5°C - 34% 0.04kPa
Mon, Apr 20 Sunrise 06:34 Sunset 20:21
24:00 ☾
-5.5°C -1.6°C -3.7°C - 6% 0.06kPa
01:00 ☾
-7.5°C -1.6°C -4.2°C - 14% 0.1kPa
02:00 ☾
-7.9°C -1.6°C -4.1°C - 12% 0.11kPa
03:00 ☾
-7.4°C -1.7°C -4.2°C - 14% 0.1kPa
04:00 ☾
-6.9°C -1.7°C -4.2°C - 13% 0.08kPa
05:00 ☾
-6.8°C -1.7°C -4.3°C - 31% 0.08kPa
06:00 ☾
-7.4°C -1.7°C -4.3°C - 10% 0.09kPa
07:00
-8°C -1.9°C -4.2°C - 48% 0.11kPa
08:00
-7°C -2.1°C -2.6°C - 61% 0.15kPa
09:00
-7.2°C -2°C -0.75°C - 38% 0.22kPa
10:00
-6.6°C -2°C 0.25°C - 6% 0.25kPa
11:00
-6.1°C -2°C 0.96°C - 18% 0.27kPa
12:00
-5.5°C -2°C 1.6°C - 18% 0.28kPa
13:00
-5.3°C -2°C 2°C - 21% 0.29kPa
14:00
-5.2°C -1.9°C 2.2°C - 32% 0.3kPa
15:00
-5.3°C -1.8°C 2.2°C - 32% 0.3kPa
16:00
-5.1°C -1.8°C 2.1°C - 77% 0.29kPa
17:00
-4.4°C -1.6°C 1.7°C - 100% 0.25kPa
18:00
-3.9°C -1.5°C 1°C - 100% 0.2kPa
19:00
-3.6°C -1.5°C 0.03°C - 98% 0.15kPa
20:00
-3.4°C -1.5°C -1.6°C - 94% 0.07kPa
21:00 ☾
-3.6°C -1.5°C -2.6°C - 73% 0.04kPa
22:00 ☾
-4.3°C -1.5°C -3.2°C - 86% 0.04kPa
23:00 ☾
-5.2°C -1.5°C -3.4°C - 96% 0.06kPa
Tue, Apr 21 Sunrise 06:32 Sunset 20:22
24:00 ☾
-6.2°C -1.5°C -3.6°C - 58% 0.08kPa
01:00 ☾
-7.4°C -1.5°C -4.1°C - 45% 0.1kPa
02:00 ☾
-9.1°C -1.6°C -4.8°C - 24% 0.12kPa
03:00 ☾
-8.7°C -1.6°C -2.8°C - 16% 0.18kPa
04:00 ☾
-8.6°C -1.6°C -0.85°C - 9% 0.25kPa
05:00 ☾
-8.8°C -1.6°C 1.1°C - 2% 0.35kPa
06:00 ☾
-8.1°C -1.6°C 1.6°C - 2% 0.35kPa
07:00
-7.4°C -1.6°C 2°C - 3% 0.36kPa
08:00
-6.7°C -1.6°C 2.5°C - 3% 0.36kPa
09:00
-5.8°C -1.5°C 2.1°C - 21% 0.31kPa
10:00
-5°C -1.4°C 1.7°C - 39% 0.27kPa
11:00
-4.3°C -1.3°C 1.3°C - 57% 0.22kPa
12:00
-4.2°C -1.3°C 0.13°C - 52% 0.17kPa
13:00
-4.3°C -1.3°C -1°C - 47% 0.12kPa
14:00
-4.5°C -1.3°C -2.2°C - 43% 0.08kPa
15:00
-5.9°C -1.3°C -3.3°C - 29% 0.09kPa
16:00
-7.3°C -1.3°C -4.4°C - 15% 0.09kPa
17:00
-8.7°C -1.3°C -5.5°C - 1% 0.09kPa
18:00
-8.7°C -1.3°C -5.3°C - 5% 0.09kPa
19:00
-8.7°C -1.3°C -5.1°C - 9% 0.1kPa
20:00
-8.7°C -1.4°C -5°C - 13% 0.1kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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