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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 Temperature2.1°C
Dew Point-6.0°C (low dew point)
Wind Speed2.0m/s (calm conditions)
Cloud Cover2%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Light Frost (radiative) at Dawn
Lauterbrunnen
Wed, Jun 17 · 04:49–05:00 · 1h window
Medium confidence
46%
❄️Frost Probability61%
Soil Temperature: 2.2°C
Dew Point: -1.0°C (low dew point)
Wind Speed: 0.8m/s (calm conditions)
Cloud Cover: 5%
thermometer-snow weather icon
Light Frost (radiative) at Sunrise
Lauterbrunnen
Wed, Jun 17 · 05:00–07:00
❄️Frost Probability:63%
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
3matching hours in the next 93 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, Jun 14
06:0061%2.4m/s
07:0057%2.2m/s
08:0065%2.4m/s
09:0066%2.5m/s
10:0061%2.8m/s
11:0061%3.1m/s
12:0064%3.5m/s
13:0068%3.6m/s
14:0068%3.6m/s
15:0068%3.7m/s
16:0068%3.8m/s
17:0049%3.9m/s
18:0055%3.9m/s
19:0051%3.8m/s
20:0046%3.5m/s
21:0035%3m/s
22:0041%2.7m/s
23:0044%2.6m/s
Mon, Jun 15
24:0052%2.6m/s
01:0057%2.5m/s
02:0057%2.2m/s
03:0061%2.2m/s
04:0061%2m/s
05:0061%2.2m/s
06:0076%2.4m/s
07:0076%2.3m/s
08:0074%2.6m/s
09:0072%2.9m/s
10:0072%3m/s
11:0064%3.3m/s
12:0064%3.5m/s
13:0061%3.6m/s
14:0061%3.8m/s
15:0046%3.7m/s
16:0046%3.5m/s
17:0046%3.4m/s
18:0051%3.2m/s
19:0047%2.9m/s
20:0053%2.3m/s
21:0040%1.8m/s
22:0039%1.2m/s
23:0039%0.87m/s
Tue, Jun 16
24:0044%0.69m/s
01:0050%1.2m/s
02:0040%1.1m/s
03:0055%1.2m/s
04:0059%0.9m/s
05:0059%1.1m/s
06:0055%1m/s
07:0048%1m/s
08:0046%1.3m/s
09:0046%1.4m/s
10:0044%1.9m/s
11:0045%1.7m/s
12:0051%1.8m/s
13:0052%2m/s
14:0046%2.8m/s
15:0043%3.1m/s
16:0046%3.3m/s
17:0042%3m/s
18:0046%3.2m/s
19:0047%3.1m/s
20:0053%2.5m/s
21:0037%1.7m/s
22:0038%1.4m/s
23:0039%1.5m/s
Wed, Jun 17
24:0043%1.3m/s
01:0039%1.1m/s
02:0055%1m/s
03:0054%0.85m/s
04:0061%0.79m/s
05:0063%0.88m/s
06:0063%1.1m/s
07:0059%1.2m/s
08:0050%1.2m/s
09:0048%1.7m/s
10:0046%2.3m/s
11:0049%2.8m/s
12:0042%2.5m/s
13:0042%2.2m/s
14:0034%1.9m/s
15:0035%1.6m/s
16:0039%1.2m/s
17:0046%0.9m/s
18:0048%0.71m/s
19:0048%0.51m/s
20:0056%0.32m/s
21:0056%0.32m/s
22:0061%0.33m/s
23:0061%0.33m/s
Thu, Jun 18
24:0061%0.35m/s
01:0061%0.36m/s
02:0063%0.37m/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
Mon, Jun 15 Sunrise 05:34 Sunset 21:23
04:00
-6°C 2.1°C 1.3°C - 2% 0.28kPa
05:00
-6.6°C 2.1°C 1.1°C - 4% 0.29kPa
06:00
-6.7°C 2°C 1.5°C - 9% 0.31kPa
07:00
-4.1°C 1.9°C 3.7°C - 5% 0.35kPa
08:00
-2.7°C 1.9°C 5.7°C - 5% 0.41kPa
09:00
-2.2°C 1.9°C 6.5°C - 5% 0.45kPa
10:00
-1.5°C 2°C 7.2°C - 5% 0.47kPa
11:00
-0.5°C 2°C 8.1°C - 27% 0.49kPa
12:00
0.1°C 1.9°C 8.6°C - 39% 0.5kPa
13:00
0.7°C 1.9°C 9°C - 42% 0.51kPa
14:00
1.2°C 2°C 9.4°C - 51% 0.51kPa
15:00
1.6°C 2.1°C 9.1°C - 51% 0.47kPa
16:00
2°C 2.1°C 9.1°C - 44% 0.45kPa
17:00
1.8°C 2.3°C 8.7°C - 41% 0.43kPa
18:00
1.6°C 2.5°C 8.2°C - 39% 0.4kPa
19:00
1.4°C 2.5°C 7.3°C - 28% 0.35kPa
20:00
1.6°C 2.5°C 6.1°C - 21% 0.26kPa
21:00
1.2°C 2.4°C 3.5°C - 22% 0.12kPa
22:00
0.2°C 2.4°C 2.1°C - 22% 0.09kPa
23:00
-0.4°C 2.3°C 1.6°C - 25% 0.09kPa
Tue, Jun 16 Sunrise 05:34 Sunset 21:23
24:00
-1°C 2.2°C 1.4°C - 25% 0.11kPa
01:00
-2°C 2.2°C 1.8°C - 12% 0.17kPa
02:00
-2.8°C 2.2°C 1.8°C - 74% 0.2kPa
03:00
-3.3°C 2.2°C 1.8°C - 17% 0.22kPa
04:00
-3.7°C 2.2°C 1.6°C - 8% 0.22kPa
05:00
-3.8°C 2.3°C 1.9°C - 5% 0.24kPa
06:00
-3.8°C 2.2°C 2.3°C - 33% 0.26kPa
07:00
-1.7°C 2.1°C 5.1°C - 100% 0.34kPa
08:00
-0.8°C 2.1°C 6.8°C - 100% 0.42kPa
09:00
-0.1°C 2.1°C 7.7°C - 100% 0.44kPa
10:00
0.1°C 2.1°C 8.4°C - 99% 0.48kPa
11:00
0.4°C 2.1°C 9.3°C - 77% 0.54kPa
12:00
0.6°C 2.1°C 10°C - 26% 0.6kPa
13:00
1.2°C 2.1°C 11°C - 22% 0.65kPa
14:00
2.1°C 2.1°C 12°C - 33% 0.66kPa
15:00
2.8°C 2.2°C 12°C - 50% 0.63kPa
16:00
3.2°C 2.3°C 12°C - 50% 0.59kPa
17:00
3.6°C 2.5°C 11°C - 85% 0.52kPa
18:00
3.7°C 2.6°C 10°C - 44% 0.47kPa
19:00
3.7°C 2.7°C 9.4°C - 28% 0.38kPa
20:00
4.1°C 2.7°C 7.8°C - 22% 0.24kPa
21:00
2.7°C 2.6°C 5.7°C - 88% 0.18kPa
22:00
2°C 2.5°C 4.8°C - 40% 0.15kPa
23:00
1.4°C 2.5°C 4.9°C - 90% 0.19kPa
Wed, Jun 17 Sunrise 05:34 Sunset 21:23
24:00
1°C 2.5°C 4.7°C - 52% 0.2kPa
01:00
0.6°C 2.4°C 4.4°C - 98% 0.2kPa
02:00
0.6°C 2.4°C 4.6°C - 23% 0.21kPa
03:00
-0.1°C 2.2°C 4°C - 7% 0.2kPa
04:00
-1°C 2.2°C 3.7°C - 5% 0.23kPa
05:00
-2.3°C 2.2°C 3.9°C - 4% 0.29kPa
06:00
-2.7°C 2.3°C 4.4°C - 5% 0.34kPa
07:00
0°C 2.2°C 7.1°C - 11% 0.39kPa
08:00
1.8°C 2.2°C 8.9°C - 53% 0.44kPa
09:00
3.6°C 2.4°C 9.8°C - 48% 0.42kPa
10:00
5.3°C 2.7°C 11°C - 43% 0.39kPa
11:00
7.1°C 3°C 12°C - 38% 0.36kPa
12:00
7.1°C 3.1°C 11°C - 34% 0.31kPa
13:00
7°C 3.1°C 10°C - 30% 0.26kPa
14:00
7°C 3.2°C 9.7°C - 26% 0.21kPa
15:00
5.9°C 3.1°C 8.5°C - 17% 0.18kPa
16:00
4.9°C 3.1°C 7.3°C - 9% 0.15kPa
17:00
3.8°C 3°C 6°C - 0% 0.13kPa
18:00
3.3°C 2.9°C 5.8°C - 2% 0.15kPa
19:00
2.8°C 2.8°C 5.5°C - 3% 0.16kPa
20:00
2.2°C 2.7°C 5.3°C - 5% 0.17kPa
21:00
1.8°C 2.7°C 5.3°C - 5% 0.19kPa
22:00
1.4°C 2.6°C 5.3°C - 5% 0.21kPa
23:00
1°C 2.6°C 5.3°C - 5% 0.23kPa
Thu, Jun 18 Sunrise 05:34 Sunset 21:23
24:00
2.1°C 2.5°C 7°C - 3% 0.29kPa
01:00
3.1°C 2.5°C 8.7°C - 2% 0.36kPa
02:00
4°C 2.5°C 10°C - 0% 0.45kPa
03:00
4.4°C 2.5°C 11°C - 7% 0.49kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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