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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-3.5°C
Dew Point-4.6°C (low dew point)
Wind Speed1.7m/s (calm conditions)
Cloud Cover71%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Light Frost
Lauterbrunnen
Tomorrow · 05:54–06:00 · 1h window
Medium confidence
48%
❄️Frost Probability65%
Soil Temperature: -3.6°C
Dew Point: -11.1°C (low dew point)
Wind Speed: 1.4m/s (calm conditions)
Cloud Cover: 35%
thermometer-snow weather icon
Light Frost at Sunrise
Lauterbrunnen
Tomorrow · 07:00–08:00
❄️Frost Probability:65%
Medium
thermometer-snow weather icon
Moderate Frost (radiative)
Lauterbrunnen
Thu, Mar 19 · 05:48–06:00
❄️Frost Probability:84%
Medium
thermometer-snow weather icon
Moderate Frost (radiative) at Sunrise
Lauterbrunnen
Thu, Mar 19 · 06:00–08:00
❄️Frost Probability:73-76%
Low
thermometer-snow weather icon
Moderate Frost (radiative)
Lauterbrunnen
Thu, Mar 19 · 08:00–08:03
❄️Frost Probability:73%
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
2matching 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, Mar 15
05:0050%3.1m/s
06:0052%2.8m/s
07:0052%2.1m/s
08:0057%1.7m/s
09:0057%1.8m/s
10:0057%2.7m/s
11:0050%2.9m/s
12:0053%2.8m/s
13:0053%2.3m/s
14:0053%1.7m/s
15:0062%1.3m/s
16:0058%0.82m/s
17:0056%0.4m/s
18:0056%0.63m/s
19:0054%0.96m/s
20:0054%0.84m/s
21:0056%0.5m/s
22:0054%0.86m/s
23:0057%0.68m/s
Mon, Mar 16
24:0064%0.32m/s
01:0071%0.74m/s
02:0065%0.84m/s
03:0059%1.2m/s
04:0056%1.8m/s
05:0065%1.4m/s
06:0063%2m/s
07:0065%1m/s
08:0082%2.1m/s
09:0077%1.7m/s
10:0072%2.5m/s
11:0071%2.3m/s
12:0067%2.5m/s
13:0067%2.5m/s
14:0067%2.1m/s
15:0067%2.5m/s
16:0067%2.2m/s
17:0067%1.9m/s
18:0058%1.3m/s
19:0067%2m/s
20:0073%0.94m/s
21:0077%1.3m/s
22:0088%1.5m/s
23:0073%1.1m/s
Tue, Mar 17
24:0084%1.3m/s
01:0080%1.3m/s
02:0073%1.3m/s
03:0073%1.6m/s
04:0075%1.8m/s
05:0077%1.7m/s
06:0072%1.8m/s
07:0071%1.9m/s
08:0068%1.9m/s
09:0059%2.2m/s
10:0060%2m/s
11:0056%1.7m/s
12:0055%1.7m/s
13:0053%1.7m/s
14:0053%1.8m/s
15:0055%1.7m/s
16:0056%1.7m/s
17:0059%1.5m/s
18:0070%1.4m/s
19:0084%1.5m/s
20:0088%1.7m/s
21:0086%1.9m/s
22:0091%2m/s
23:0091%2.2m/s
Wed, Mar 18
24:0086%2.3m/s
01:0086%2.4m/s
02:0082%2.2m/s
03:0067%1.9m/s
04:0065%1.6m/s
05:0058%1.6m/s
06:0055%1.5m/s
07:0054%1.4m/s
08:0054%1.3m/s
09:0054%1.2m/s
10:0054%1.1m/s
11:0055%1m/s
12:0065%0.96m/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, Mar 15 Sunrise 06:41 Sunset 18:33
14:00
-4.6°C -3.5°C -3.9°C - 71% 0.03kPa
15:00
-4.9°C -3.6°C -3.8°C - 60% 0.04kPa
16:00
-5.2°C -3.6°C -4°C - 87% 0.04kPa
17:00
-5°C -3.5°C -4.4°C - 100% 0.02kPa
18:00
-5.4°C -3.5°C -5.1°C - 100% 0.01kPa
19:00
-6.3°C -3.5°C -6.1°C - 100% 0.01kPa
20:00
-6.3°C -3.5°C -5.9°C - 100% 0.01kPa
21:00
-6.7°C -3.5°C -6.3°C - 100% 0.01kPa
22:00
-7.6°C -3.5°C -7.2°C - 99% 0.01kPa
23:00
-8°C -3.5°C -7.5°C - 72% 0.01kPa
Mon, Mar 16 Sunrise 06:41 Sunset 18:33
24:00
-10°C -3.5°C -9.2°C - 41% 0.02kPa
01:00
-12°C -3.5°C -10°C - 22% 0.03kPa
02:00
-12°C -3.5°C -11°C - 29% 0.03kPa
03:00
-12°C -3.5°C -11°C - 65% 0.03kPa
04:00
-12°C -3.6°C -11°C - 88% 0.03kPa
05:00
-11°C -3.6°C -9.6°C - 35% 0.03kPa
06:00
-13°C -3.6°C -11°C - 31% 0.03kPa
07:00
-13°C -3.6°C -12°C - 30% 0.04kPa
08:00
-13°C -3.6°C -8°C - 2% 0.11kPa
09:00
-12°C -3.5°C -5.1°C - 59% 0.18kPa
10:00
-11°C -3.5°C -3.9°C - 66% 0.19kPa
11:00
-9.7°C -3.6°C -3.4°C - 100% 0.18kPa
12:00
-8.9°C -3.5°C -3°C - 100% 0.18kPa
13:00
-8.2°C -3.5°C -2.7°C - 100% 0.17kPa
14:00
-8°C -3.5°C -2.6°C - 100% 0.17kPa
15:00
-7.9°C -3.5°C -2.3°C - 100% 0.18kPa
16:00
-7.8°C -3.6°C -2.5°C - 100% 0.17kPa
17:00
-7.2°C -3.5°C -3.3°C - 100% 0.12kPa
18:00
-9.1°C -3.5°C -6.2°C - 100% 0.08kPa
19:00
-13°C -3.5°C -7.3°C - 100% 0.12kPa
20:00
-15°C -3.5°C -7.1°C - 100% 0.16kPa
21:00
-17°C -3.5°C -7.3°C - 42% 0.19kPa
22:00
-18°C -3.5°C -8.1°C - 5% 0.18kPa
23:00
-17°C -3.5°C -8°C - 100% 0.18kPa
Tue, Mar 17 Sunrise 06:39 Sunset 18:35
24:00
-16°C -3.6°C -7.2°C - 23% 0.18kPa
01:00
-16°C -3.6°C -7.3°C - 27% 0.18kPa
02:00
-16°C -3.6°C -7.2°C - 96% 0.18kPa
03:00
-15°C -3.6°C -6.5°C - 93% 0.19kPa
04:00
-15°C -3.6°C -6.4°C - 58% 0.19kPa
05:00
-15°C -3.6°C -6.2°C - 56% 0.19kPa
06:00
-14°C -3.6°C -5.9°C - 80% 0.19kPa
07:00
-13°C -3.6°C -5.4°C - 94% 0.18kPa
08:00
-8.2°C -3.6°C -2.6°C - 71% 0.17kPa
09:00
-2.7°C -3.6°C -0.05°C - 87% 0.11kPa
10:00
-0.7°C -3.5°C 0.41°C - 42% 0.05kPa
11:00
0.3°C -3.6°C 0.8°C - 40% 0.02kPa
12:00
0.9°C -3.5°C 0.94°C - 69% 0kPa
13:00
0.4°C -3.6°C 0.38°C - 72% 0kPa
14:00
0.4°C -3.6°C 0.36°C - 77% 0kPa
15:00
0.3°C -3.6°C 0.26°C - 72% 0kPa
16:00
0.2°C -3.6°C 0.41°C - 59% 0.01kPa
17:00
-0.7°C -3.5°C 1.1°C - 60% 0.08kPa
18:00
-5.2°C -3.5°C -1.2°C - 63% 0.14kPa
19:00
-9.6°C -3.5°C -3.6°C - 9% 0.17kPa
20:00
-10°C -3.5°C -3.7°C - 8% 0.19kPa
21:00
-11°C -3.5°C -3.8°C - 6% 0.2kPa
22:00
-12°C -3.5°C -3.9°C - 4% 0.22kPa
23:00
-12°C -3.5°C -3.8°C - 5% 0.21kPa
Wed, Mar 18 Sunrise 06:37 Sunset 18:36
24:00
-11°C -3.5°C -3.8°C - 6% 0.2kPa
01:00
-11°C -3.5°C -3.8°C - 8% 0.19kPa
02:00
-6.7°C -3.5°C -2.2°C - 10% 0.15kPa
03:00
-3°C -3.5°C -0.51°C - 12% 0.1kPa
04:00
0.5°C -3.5°C 1.1°C - 14% 0.03kPa
05:00
0.9°C -3.5°C 1.4°C - 42% 0.02kPa
06:00
1.4°C -3.5°C 1.6°C - 71% 0.01kPa
07:00
1.8°C -3.5°C 1.8°C - 100% 0kPa
08:00
1°C -3.5°C 1°C - 97% 0kPa
09:00
0.2°C -3.5°C 0.21°C - 95% 0kPa
10:00
-0.6°C -3.5°C -0.58°C - 92% 0kPa
11:00
-3°C -3.4°C -2.1°C - 62% 0.03kPa
12:00
-5.3°C -3.4°C -3.6°C - 33% 0.06kPa
13:00
-7.8°C -3.4°C -5.1°C - 3% 0.08kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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