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Rule Morning Frost

St. Moritz - Morning Frost - Alps

Saint Moritz, Canton Grisons, Switzerland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature-2.1°C
Dew Point-18.0°C (low dew point)
Wind Speed1.1m/s (calm conditions)
Cloud Cover66%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Light Frost
St. Moritz
Thu, Feb 26 · 08:00–08:35 · 1h window
Low confidence
33%
❄️Frost Probability61%
Soil Temperature: -2.9°C
Dew Point: -0.3°C (low dew point)
Wind Speed: 1.4m/s (calm conditions)
Cloud Cover: 35%

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
1matching 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
Sat, Feb 21
20:0050%2.9m/s
21:0050%2.9m/s
22:0052%2.6m/s
23:0052%2.4m/s
Sun, Feb 22
24:0052%2.2m/s
01:0052%1.9m/s
02:0056%2.1m/s
03:0060%1.7m/s
04:0060%1.8m/s
05:0081%1.6m/s
06:0081%1.7m/s
07:0084%1.4m/s
08:0088%1.6m/s
09:0082%1.7m/s
10:0093%1.6m/s
11:0080%1.7m/s
12:0058%1.4m/s
13:0054%0.82m/s
14:0057%0.35m/s
15:0054%0.88m/s
16:0058%1.5m/s
17:0071%0.6m/s
18:0075%0.52m/s
19:0077%0.82m/s
20:0077%1.1m/s
21:0076%1.4m/s
22:0076%1.4m/s
23:0071%0.96m/s
Mon, Feb 23
24:0071%1.1m/s
01:0073%1.3m/s
02:0073%1.4m/s
03:0071%1.9m/s
04:0073%1.5m/s
05:0064%2.5m/s
06:0067%2.1m/s
07:0063%2.2m/s
08:0056%2.4m/s
09:0059%2.6m/s
10:0058%3.2m/s
11:0054%2.9m/s
12:0051%3m/s
13:0050%3.2m/s
14:0050%2.8m/s
15:0050%2.8m/s
16:0050%3.4m/s
17:0050%3.1m/s
18:0050%3.4m/s
19:0050%3.2m/s
20:0051%3.5m/s
21:0051%3.3m/s
22:0051%3.5m/s
23:0051%3.8m/s
Tue, Feb 24
24:0050%3.6m/s
01:0050%3.2m/s
02:0050%3.1m/s
03:0054%3m/s
04:0050%2.8m/s
05:0053%2.6m/s
06:0052%1.9m/s
07:0052%2.1m/s
08:0052%2.5m/s
09:0050%2.8m/s
10:0050%3m/s
11:0050%3.1m/s
12:0050%3.1m/s
13:0050%3.3m/s
14:0050%3.7m/s
15:0050%3.8m/s
16:0049%3.8m/s
17:0055%3.5m/s
18:0059%3.4m/s
19:0061%2.7m/s
20:0061%2.3m/s
21:0069%2.2m/s
22:0069%2m/s
23:0069%1.9m/s
Wed, Feb 25
24:0082%1.8m/s
01:0082%2m/s
02:0084%1.7m/s
03:0076%1.4m/s
04:0073%1.1m/s
05:0069%1.4m/s
06:0061%1.7m/s
07:0056%2m/s
08:0056%2m/s
09:0056%2m/s
10:0056%2m/s
11:0060%1.8m/s
12:0062%1.6m/s
13:0070%1.4m/s
14:0073%1.2m/s
15:0070%1m/s
16:0074%0.84m/s
17:0077%0.88m/s
18:0085%0.92m/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, Feb 22 Sunrise 07:13 Sunset 17:55
20:00
-18°C -2.1°C -6.7°C - 66% 0.22kPa
21:00
-18°C -2.1°C -7°C - 96% 0.21kPa
22:00
-18°C -2.1°C -7.2°C - 94% 0.21kPa
23:00
-17°C -2.1°C -7.1°C - 100% 0.2kPa
Mon, Feb 23 Sunrise 07:13 Sunset 17:55
24:00
-17°C -2.2°C -7.4°C - 100% 0.2kPa
01:00
-16°C -2.2°C -7.1°C - 97% 0.19kPa
02:00
-16°C -2.3°C -7.8°C - 100% 0.17kPa
03:00
-15°C -2.3°C -8°C - 99% 0.15kPa
04:00
-14°C -2.4°C -8.7°C - 53% 0.11kPa
05:00
-13°C -2.4°C -8.6°C - 85% 0.09kPa
06:00
-11°C -2.5°C -8.1°C - 19% 0.07kPa
07:00
-11°C -2.5°C -9.1°C - 31% 0.04kPa
08:00
-8.9°C -2.5°C -8°C - 49% 0.02kPa
09:00
-5.6°C -2.5°C -4.8°C - 29% 0.02kPa
10:00
-3.9°C -2.5°C -2.8°C - 47% 0.04kPa
11:00
-2.6°C -2.5°C -2.3°C - 44% 0.01kPa
12:00
-2.1°C -2.5°C -2.1°C - 79% 0kPa
13:00
-2.4°C -2.5°C -2.4°C - 97% 0kPa
14:00
-2.6°C -2.5°C -2.6°C - 100% 0kPa
15:00
-2.6°C -2.4°C -2.5°C - 100% 0.01kPa
16:00
-3.1°C -2.3°C -2.7°C - 88% 0.01kPa
17:00
-3.7°C -2.3°C -3.2°C - 91% 0.02kPa
18:00
-4.3°C -2.2°C -3.7°C - 86% 0.02kPa
19:00
-4.6°C -2.2°C -3.9°C - 80% 0.02kPa
20:00
-4.8°C -2.2°C -4.1°C - 79% 0.02kPa
21:00
-5.2°C -2.2°C -4.4°C - 77% 0.02kPa
22:00
-5.4°C -2.2°C -4.8°C - 73% 0.02kPa
23:00
-5.6°C -2.1°C -5.1°C - 66% 0.02kPa
Tue, Feb 24 Sunrise 07:11 Sunset 17:57
24:00
-5.6°C -2.1°C -5°C - 80% 0.02kPa
01:00
-5.8°C -2.1°C -5.2°C - 100% 0.02kPa
02:00
-6.7°C -2.1°C -6.1°C - 98% 0.02kPa
03:00
-7.4°C -2.2°C -7.1°C - 54% 0.01kPa
04:00
-7.3°C -2.2°C -7.2°C - 83% 0kPa
05:00
-7.1°C -2.2°C -7°C - 79% 0kPa
06:00
-6.5°C -2.2°C -6.5°C - 100% 0kPa
07:00
-5.6°C -2.3°C -5.5°C - 100% 0kPa
08:00
-4.5°C -2.3°C -4.4°C - 95% 0kPa
09:00
-3.2°C -2.3°C -3.1°C - 94% 0kPa
10:00
-2.3°C -2.3°C -2.3°C - 98% 0kPa
11:00
-2°C -2.2°C -2°C - 99% 0kPa
12:00
-1.7°C -2.2°C -1.7°C - 100% 0kPa
13:00
-1.4°C -2.1°C -1.4°C - 100% 0kPa
14:00
-1.1°C -2.1°C -1.1°C - 100% 0kPa
15:00
-0.8°C -2°C -0.8°C - 83% 0kPa
16:00
-1°C -1.9°C -0.81°C - 62% 0.01kPa
17:00
-1.8°C -1.9°C -1.1°C - 38% 0.03kPa
18:00
-4°C -1.8°C -3.2°C - 25% 0.03kPa
19:00
-5°C -1.8°C -4.4°C - 19% 0.02kPa
20:00
-5.7°C -1.9°C -4.9°C - 10% 0.03kPa
21:00
-6.2°C -1.9°C -4.9°C - 10% 0.04kPa
22:00
-6.5°C -1.9°C -4.5°C - 9% 0.06kPa
23:00
-6.9°C -1.9°C -4°C - 5% 0.09kPa
Wed, Feb 25 Sunrise 07:09 Sunset 17:58
24:00
-7.4°C -2°C -3.5°C - 1% 0.12kPa
01:00
-7.9°C -2.1°C -3.1°C - 5% 0.15kPa
02:00
-5.6°C -2.3°C -1.8°C - 3% 0.13kPa
03:00
-3.3°C -2.5°C -0.47°C - 2% 0.11kPa
04:00
-1°C -2.6°C 0.85°C - 0% 0.08kPa
05:00
-0.3°C -2.6°C 0.96°C - 16% 0.06kPa
06:00
0.5°C -2.5°C 1.1°C - 32% 0.03kPa
07:00
1.2°C -2.4°C 1.2°C - 48% 0kPa
08:00
0.5°C -2.3°C 0.71°C - 46% 0.01kPa
09:00
-0.2°C -2.2°C 0.25°C - 44% 0.02kPa
10:00
-0.9°C -2.2°C -0.21°C - 42% 0.03kPa
11:00
-3.2°C -2.1°C -1.6°C - 42% 0.06kPa
12:00
-5.4°C -2.1°C -3.1°C - 43% 0.08kPa
13:00
-7.7°C -2°C -4.5°C - 43% 0.1kPa
14:00
-8.6°C -2.1°C -4.3°C - 53% 0.12kPa
15:00
-9.5°C -2.3°C -4.1°C - 63% 0.15kPa
16:00
-11°C -2.4°C -3.9°C - 73% 0.18kPa
17:00
-11°C -2.5°C -3.9°C - 51% 0.2kPa
18:00
-12°C -2.7°C -3.9°C - 28% 0.21kPa
19:00
-12°C -2.8°C -3.8°C - 5% 0.22kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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