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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 Temperature1.7°C
Dew Point-4.2°C (low dew point)
Wind Speed2.2m/s (calm conditions)
Cloud Cover5%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Light Frost
St. Moritz
Fri, Apr 17 · 08:00–08:00 · 1h window
Low confidence
32%
❄️Frost Probability68%
Soil Temperature: 0.5°C
Dew Point: -1.9°C (low dew point)
Wind Speed: 1.4m/s (calm conditions)
Cloud Cover: 43%

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
0matching hours in the next 92 hours
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
Wed, Apr 8
06:0075%2.9m/s
07:0077%2.7m/s
08:0077%2.6m/s
09:0082%2.5m/s
10:0086%2.8m/s
11:0086%2.6m/s
12:0084%2.7m/s
13:0084%2.8m/s
14:0072%3m/s
15:0076%2.8m/s
16:0074%2.9m/s
17:0059%3.1m/s
18:0055%3.1m/s
19:0050%3m/s
20:0039%3m/s
21:0056%2.6m/s
22:0052%2.5m/s
23:0052%2.4m/s
Thu, Apr 9
24:0048%2.2m/s
01:0056%1.9m/s
02:0059%2.1m/s
03:0067%2.2m/s
04:0067%2m/s
05:0076%2m/s
06:0062%2m/s
07:0060%2.1m/s
08:0070%2.4m/s
09:0068%2.6m/s
10:0066%3.1m/s
11:0052%3.2m/s
12:0055%3.3m/s
13:0055%3.4m/s
14:0056%3.5m/s
15:0056%3.4m/s
16:0044%3.6m/s
17:0048%3.6m/s
18:0046%3.6m/s
19:0050%3.2m/s
20:0043%3.1m/s
21:0037%2.7m/s
22:0034%2.4m/s
23:0026%2.6m/s
Fri, Apr 10
24:0015%2.5m/s
01:0030%2.5m/s
02:0034%2.3m/s
03:0023%2.7m/s
04:0019%2.4m/s
05:0037%2.2m/s
06:0037%2.5m/s
07:0037%2.4m/s
08:0037%2.2m/s
09:0037%2.5m/s
10:0040%2.9m/s
11:0044%3.4m/s
12:0044%3.4m/s
13:0044%3.5m/s
14:0044%3.4m/s
15:0042%3.2m/s
16:0037%3m/s
17:0035%2.8m/s
18:0037%2.8m/s
19:0031%3.1m/s
20:0020%2.4m/s
21:0020%2.3m/s
22:0025%1.3m/s
23:0023%1.8m/s
Sat, Apr 11
24:0036%1.1m/s
01:0023%0.6m/s
02:0033%0.47m/s
03:0042%0.34m/s
04:0041%0.57m/s
05:0039%1m/s
06:0039%1.4m/s
07:0044%1.5m/s
08:0048%1.2m/s
09:0040%1.1m/s
10:003.8%1m/s
11:000%0.96m/s
12:003.8%1.4m/s
13:003.7%1.9m/s
14:003.3%2.4m/s
15:001.9%2.8m/s
16:001.4%3.2m/s
17:0015%3.6m/s
18:0015%3.3m/s
19:0015%3.1m/s
20:0019%2.8m/s
21:0019%2.7m/s
22:0015%2.7m/s
23:0015%2.6m/s
Sun, Apr 12
24:0026%2.7m/s
01:0026%2.8m/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
Thu, Apr 9 Sunrise 06:45 Sunset 19:59
03:00
-4.2°C 1.7°C -0.25°C - 5% 0.15kPa
04:00
-5.7°C 1.7°C -0.3°C - 5% 0.2kPa
05:00
-7.3°C 1.6°C -0.19°C - 7% 0.25kPa
06:00
-8.9°C 1.5°C 0.008°C - 75% 0.3kPa
07:00
-9.9°C 1.4°C 0.19°C - 68% 0.33kPa
08:00
-8.9°C 1.2°C 1.8°C - 11% 0.38kPa
09:00
-9.2°C 1.2°C 3.5°C - 20% 0.48kPa
10:00
-9.4°C 1.2°C 4.8°C - 22% 0.56kPa
11:00
-9.2°C 1.1°C 5.8°C - 43% 0.62kPa
12:00
-8.7°C 1.1°C 6.7°C - 35% 0.66kPa
13:00
-8.2°C 1.1°C 7°C - 36% 0.67kPa
14:00
-7.3°C 1.2°C 7.2°C - 52% 0.66kPa
15:00
-6.4°C 1.6°C 7.1°C - 54% 0.63kPa
16:00
-5.6°C 2.8°C 6.9°C - 43% 0.59kPa
17:00
-5°C 3.7°C 6.5°C - 5% 0.54kPa
18:00
-4.4°C 4.2°C 5.8°C - 5% 0.48kPa
19:00
-2.5°C 4.1°C 4.6°C - 5% 0.34kPa
20:00
-2.3°C 3.7°C 2.1°C - 5% 0.2kPa
21:00
-1.4°C 3.5°C 1.3°C - 5% 0.12kPa
22:00
-1.1°C 3.3°C 0.68°C - 5% 0.08kPa
23:00
-0.8°C 3.3°C 0.37°C - 37% 0.05kPa
Fri, Apr 10 Sunrise 06:45 Sunset 19:59
24:00
-0.8°C 3.3°C 0.08°C - 91% 0.04kPa
01:00
-0.8°C 3.3°C 0.08°C - 5% 0.04kPa
02:00
-1.4°C 3.3°C -0.3°C - 5% 0.05kPa
03:00
-2.1°C 3.3°C -0.35°C - 50% 0.07kPa
04:00
-2.6°C 3.2°C -0.51°C - 100% 0.08kPa
05:00
-3.5°C 2.9°C -0.28°C - 100% 0.13kPa
06:00
-4.4°C 2.9°C -0.35°C - 100% 0.15kPa
07:00
-4.1°C 2.4°C -0.43°C - 100% 0.14kPa
08:00
-3.5°C 2°C 0.69°C - 100% 0.17kPa
09:00
-3°C 2°C 1.7°C - 100% 0.2kPa
10:00
-3.1°C 2.1°C 2.8°C - 100% 0.26kPa
11:00
-3.6°C 2.1°C 3.9°C - 100% 0.34kPa
12:00
-3.9°C 2.1°C 4.5°C - 100% 0.38kPa
13:00
-3.5°C 2.1°C 4.9°C - 100% 0.4kPa
14:00
-3.1°C 2.2°C 5.3°C - 100% 0.4kPa
15:00
-2.8°C 2.8°C 5.6°C - 100% 0.42kPa
16:00
-2.6°C 3.5°C 5.5°C - 100% 0.4kPa
17:00
-2.5°C 4.2°C 5.2°C - 100% 0.38kPa
18:00
-2.1°C 4.7°C 4.9°C - 93% 0.34kPa
19:00
-1.2°C 4.6°C 4°C - 84% 0.25kPa
20:00
-0.4°C 4.2°C 2.2°C - 83% 0.12kPa
21:00
-0.1°C 3.8°C 1.4°C - 65% 0.07kPa
22:00
-0.4°C 3.6°C 0.85°C - 51% 0.06kPa
23:00
-0.8°C 3.3°C 0.58°C - 48% 0.06kPa
Sat, Apr 11 Sunrise 06:43 Sunset 20:01
24:00
-1.2°C 3.3°C 0.19°C - 5% 0.06kPa
01:00
-1.5°C 3.3°C 0.29°C - 97% 0.08kPa
02:00
-1.9°C 2.9°C 0.89°C - 88% 0.12kPa
03:00
-2.6°C 2.7°C 0.96°C - 73% 0.15kPa
04:00
-3.1°C 2.7°C 0.67°C - 100% 0.16kPa
05:00
-3.4°C 2.6°C 0.96°C - 100% 0.18kPa
06:00
-3.6°C 2.5°C 1.1°C - 100% 0.19kPa
07:00
-4°C 2.4°C 1.1°C - 100% 0.21kPa
08:00
-3.8°C 2.1°C 2.7°C - 91% 0.28kPa
09:00
-3.9°C 4.2°C 4.8°C - 73% 0.4kPa
10:00
-4.4°C 6.2°C 7°C - 55% 0.56kPa
11:00
-5.5°C 8.2°C 9.1°C - 38% 0.75kPa
12:00
-2.6°C 8°C 7.6°C - 50% 0.54kPa
13:00
-0.7°C 7.8°C 6.2°C - 62% 0.36kPa
14:00
0.6°C 7.6°C 4.7°C - 75% 0.21kPa
15:00
0.9°C 6.8°C 3.9°C - 82% 0.15kPa
16:00
1.1°C 6.1°C 3.1°C - 89% 0.1kPa
17:00
1.3°C 5.4°C 2.3°C - 96% 0.05kPa
18:00
1.2°C 4.9°C 2.3°C - 97% 0.05kPa
19:00
1.2°C 4.4°C 2.3°C - 99% 0.06kPa
20:00
1.1°C 4°C 2.3°C - 100% 0.06kPa
21:00
0.8°C 3.7°C 1.8°C - 97% 0.05kPa
22:00
0.4°C 3.4°C 1.4°C - 95% 0.04kPa
23:00
0.1°C 3°C 0.92°C - 92% 0.04kPa
Sun, Apr 12 Sunrise 06:41 Sunset 20:02
24:00
-0.4°C 2.8°C 0.85°C - 94% 0.06kPa
01:00
-0.9°C 2.6°C 0.78°C - 96% 0.07kPa
02:00
-1.3°C 2.4°C 0.71°C - 97% 0.09kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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