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Rule Morning Frost

Lauterbrunnen - Morning Frost - Alps

Lauterbrunnen, Bern, Switzerland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature-0.4°C
Dew Point3.8°C (low dew point)
Wind Speed2.4m/s (calm conditions)
Cloud Cover29%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Moderate Frost (radiative)
Lauterbrunnen
Tomorrow · 04:59–05:00 · 1h window
Medium confidence
58%
❄️Frost Probability74%
Soil Temperature: -0.3°C
Dew Point: 1.6°C (low dew point)
Wind Speed: 0.9m/s (calm conditions)
Cloud Cover: 5%
thermometer-snow weather icon
Moderate Frost (radiative) at Sunrise
Lauterbrunnen
Tomorrow · 05:00–07:00
❄️Frost Probability:65-76%
Medium
thermometer-snow weather icon
Light Frost
Lauterbrunnen
Tomorrow · 07:00–07:14
❄️Frost Probability:69%
Medium
thermometer-snow weather icon
Light Frost (radiative)
Lauterbrunnen
Tue, May 26 · 07:00–07:13
❄️Frost Probability:63%
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
7matching hours in the next 80 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
Sun, May 24
06:0087%1.2m/s
07:0089%1m/s
08:0087%0.84m/s
09:0086%0.34m/s
10:0086%0.22m/s
11:0082%0.76m/s
12:0080%0.99m/s
13:0080%1.3m/s
14:0078%1.8m/s
15:0076%2.4m/s
16:0074%3.2m/s
17:0070%3.6m/s
18:0072%3.1m/s
19:0071%2.2m/s
20:0070%1.5m/s
21:0065%1.7m/s
22:0067%1.5m/s
23:0074%1.5m/s
Mon, May 25
24:0074%1.1m/s
01:0074%1.1m/s
02:0074%1m/s
03:0070%0.94m/s
04:0074%0.91m/s
05:0076%0.48m/s
06:0065%0.56m/s
07:0069%0.78m/s
08:0072%0.83m/s
09:0078%0.5m/s
10:0083%0.44m/s
11:0087%0.42m/s
12:0080%0.75m/s
13:0072%0.99m/s
14:0070%1.9m/s
15:0067%2.7m/s
16:0042%3.1m/s
17:0045%2.6m/s
18:0050%2.4m/s
19:0044%2.1m/s
20:0043%1.6m/s
21:0039%1.3m/s
22:0043%1.1m/s
23:0043%1.4m/s
Tue, May 26
24:0046%1.3m/s
01:0046%0.95m/s
02:0048%0.61m/s
03:0048%0.55m/s
04:0048%0.52m/s
05:0048%0.53m/s
06:0059%0.31m/s
07:0063%0.38m/s
08:0076%0.78m/s
09:0072%0.78m/s
10:0070%0.8m/s
11:0061%0.86m/s
12:0061%1m/s
13:0058%1.5m/s
14:0044%2m/s
15:0040%2.7m/s
16:0040%3.3m/s
17:0040%3.4m/s
18:0033%3m/s
19:0027%2.2m/s
20:0031%1.1m/s
21:0032%1.1m/s
22:0038%1.1m/s
23:0061%1.2m/s
Wed, May 27
24:0061%1.3m/s
01:0061%1.4m/s
02:0061%1.5m/s
03:0070%1.6m/s
04:0066%1.7m/s
05:0061%1.8m/s
06:0046%2.1m/s
07:0046%2.5m/s
08:0041%2.8m/s
09:0041%2.8m/s
10:0044%2.9m/s
11:0044%2.9m/s
12:0031%2.6m/s
13:0026%2.3m/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, May 24 Sunrise 05:45 Sunset 21:05
15:00
3.8°C -0.43°C 13°C - 29% 0.71kPa
16:00
4.8°C -0.33°C 12°C - 42% 0.58kPa
17:00
5.8°C -0.33°C 12°C - 42% 0.45kPa
18:00
5.9°C -0.23°C 11°C - 54% 0.38kPa
19:00
5.7°C -0.14°C 10°C - 76% 0.31kPa
20:00
5.4°C -0.14°C 7.8°C - 23% 0.16kPa
21:00
3.9°C -0.24°C 5.2°C - 22% 0.08kPa
22:00
3.3°C -0.24°C 4.9°C - 22% 0.1kPa
23:00
2.4°C -0.34°C 4.5°C - 5% 0.11kPa
Mon, May 25 Sunrise 05:45 Sunset 21:05
24:00
2.1°C -0.34°C 4.7°C - 5% 0.14kPa
01:00
1.8°C -0.34°C 4.4°C - 5% 0.14kPa
02:00
1.9°C -0.34°C 4.3°C - 5% 0.13kPa
03:00
1.7°C -0.35°C 4.1°C - 18% 0.13kPa
04:00
1.6°C -0.31°C 4.1°C - 5% 0.13kPa
05:00
1.2°C -0.31°C 3.8°C - 5% 0.13kPa
06:00
1.1°C -0.32°C 4°C - 48% 0.15kPa
07:00
3.1°C -0.31°C 6.5°C - 90% 0.2kPa
08:00
4.5°C -0.31°C 8.8°C - 95% 0.29kPa
09:00
4.5°C -0.31°C 9.7°C - 42% 0.36kPa
10:00
4.9°C -0.31°C 11°C - 22% 0.44kPa
11:00
4.9°C -0.33°C 12°C - 22% 0.49kPa
12:00
5.2°C -0.13°C 12°C - 40% 0.54kPa
13:00
5.5°C 0.37°C 13°C - 66% 0.58kPa
14:00
6.4°C 0.67°C 12°C - 76% 0.48kPa
15:00
7.3°C 0.87°C 11°C - 87% 0.32kPa
16:00
8.2°C 1.1°C 11°C - 96% 0.19kPa
17:00
7.9°C 1.2°C 11°C - 70% 0.2kPa
18:00
7.9°C 1.5°C 11°C - 79% 0.22kPa
19:00
7.9°C 1.6°C 10°C - 94% 0.16kPa
20:00
7.7°C 1.7°C 8.9°C - 100% 0.09kPa
21:00
6.8°C 1.7°C 7.7°C - 100% 0.06kPa
22:00
5.9°C 1.6°C 7.1°C - 100% 0.08kPa
23:00
5.4°C 1.6°C 6.8°C - 98% 0.09kPa
Tue, May 26 Sunrise 05:44 Sunset 21:06
24:00
4.7°C 1.5°C 6.4°C - 86% 0.11kPa
01:00
3.9°C 1.4°C 5.8°C - 83% 0.11kPa
02:00
3.6°C 1.4°C 5.5°C - 81% 0.12kPa
03:00
3.4°C 1.3°C 5.4°C - 87% 0.12kPa
04:00
3.2°C 1.2°C 5.2°C - 100% 0.12kPa
05:00
3.2°C 1.2°C 5.1°C - 88% 0.11kPa
06:00
3.1°C 1.1°C 5.1°C - 17% 0.12kPa
07:00
5.2°C 1.1°C 7.5°C - 2% 0.15kPa
08:00
6.1°C 1.2°C 9.5°C - 3% 0.25kPa
09:00
6.3°C 1.2°C 11°C - 21% 0.31kPa
10:00
6.4°C 1.3°C 11°C - 24% 0.36kPa
11:00
6.6°C 1.4°C 12°C - 45% 0.42kPa
12:00
6.8°C 1.8°C 13°C - 60% 0.49kPa
13:00
7.7°C 2°C 13°C - 74% 0.48kPa
14:00
8°C 2.3°C 13°C - 50% 0.42kPa
15:00
8.6°C 2.6°C 13°C - 83% 0.42kPa
16:00
8.6°C 2.9°C 13°C - 100% 0.37kPa
17:00
8.2°C 3°C 12°C - 100% 0.29kPa
18:00
7.7°C 3.1°C 11°C - 100% 0.26kPa
19:00
7.4°C 3.1°C 10°C - 100% 0.21kPa
20:00
7.1°C 3°C 8.9°C - 100% 0.14kPa
21:00
5.6°C 2.6°C 7.7°C - 69% 0.15kPa
22:00
4°C 2.3°C 6.5°C - 37% 0.16kPa
23:00
2.5°C 2°C 5.4°C - 6% 0.16kPa
Wed, May 27 Sunrise 05:43 Sunset 21:07
24:00
3.7°C 1.9°C 6.5°C - 4% 0.17kPa
01:00
5°C 1.8°C 7.7°C - 3% 0.18kPa
02:00
6.2°C 1.7°C 8.9°C - 1% 0.19kPa
03:00
6.5°C 1.8°C 9.7°C - 16% 0.23kPa
04:00
6.8°C 1.8°C 10°C - 32% 0.28kPa
05:00
7.1°C 1.9°C 11°C - 47% 0.33kPa
06:00
7.3°C 2°C 11°C - 53% 0.33kPa
07:00
7.5°C 2.1°C 12°C - 59% 0.34kPa
08:00
7.7°C 2.3°C 12°C - 65% 0.35kPa
09:00
7.7°C 2.5°C 12°C - 61% 0.32kPa
10:00
7.7°C 2.7°C 11°C - 57% 0.3kPa
11:00
7.7°C 3°C 11°C - 54% 0.28kPa
12:00
7.6°C 3.1°C 10°C - 53% 0.22kPa
13:00
7.5°C 3.2°C 9.6°C - 52% 0.16kPa
14:00
7.3°C 3.3°C 8.8°C - 52% 0.11kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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