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Rule Morning Frost

Saas-Fee - Morning Frost - Alps

Saas-Fee, Valais, Switzerland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature5.8°C
Dew Point-9.1°C (low dew point)
Wind Speed4.0m/s (calm conditions)
Cloud Cover0%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Light Frost (radiative)
Saas-Fee
Fri, Apr 17 · 05:53–06:00 · 1h window
Low confidence
30%
❄️Frost Probability61%
Soil Temperature: 1.1°C
Dew Point: -0.4°C (low dew point)
Wind Speed: 1.2m/s (calm conditions)
Cloud Cover: 2%

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
06:0048%3.4m/s
07:0046%3.2m/s
08:0050%2.4m/s
09:0049%1m/s
10:0047%0.84m/s
11:0047%1.5m/s
12:0045%2.1m/s
13:004.4%2.3m/s
14:000%2.8m/s
15:000%2.7m/s
16:000%2.7m/s
17:000%2.6m/s
18:000%2.5m/s
19:000%2.1m/s
20:000%2.6m/s
21:000%3.4m/s
22:004.5%3.5m/s
23:004.9%3.4m/s
Thu, Apr 9
24:004.9%3.6m/s
01:004.7%3.9m/s
02:0046%3.9m/s
03:0046%4m/s
04:0042%3.9m/s
05:0042%3.9m/s
06:0042%3.9m/s
07:0042%4.1m/s
08:0039%3.7m/s
09:0041%2.6m/s
10:0037%1.8m/s
11:0037%1.8m/s
12:0037%2.1m/s
13:0039%2.5m/s
14:003.8%2.5m/s
15:000%2.7m/s
16:000%2.8m/s
17:000%2.7m/s
18:000%2.8m/s
19:000%3m/s
20:000%3.7m/s
21:000%4m/s
22:002.9%4.3m/s
23:003.5%4.2m/s
Fri, Apr 10
24:004.3%4.4m/s
01:004.7%4.6m/s
02:003.2%4.5m/s
03:003.6%4.9m/s
04:0044%5m/s
05:0033%4.8m/s
06:0033%4.9m/s
07:0037%4.7m/s
08:0046%4.3m/s
09:0026%2.9m/s
10:0026%2m/s
11:0026%2m/s
12:0026%2m/s
13:0026%2.2m/s
14:002.9%2.1m/s
15:000%2.3m/s
16:000%2.2m/s
17:000%2.1m/s
18:000%2m/s
19:000%1.8m/s
20:000%2.2m/s
21:000%2.7m/s
22:004%2.3m/s
23:004.3%1.8m/s
Sat, Apr 11
24:004.5%1.6m/s
01:004.9%1.3m/s
02:003.8%1.2m/s
03:0039%1.4m/s
04:0039%1.4m/s
05:0039%1.2m/s
06:0054%1.3m/s
07:0054%1.3m/s
08:0054%1.3m/s
09:004.5%1.6m/s
10:000%1.9m/s
11:000%2.3m/s
12:000%2m/s
13:000%1.7m/s
14:000%1.4m/s
15:000%1.7m/s
16:000%2m/s
17:001.2%2.3m/s
18:001.2%2.3m/s
19:001.2%2.4m/s
20:001.6%2.4m/s
21:0013%2.4m/s
22:0013%2.4m/s
23:0013%2.4m/s
Sun, Apr 12
24:0013%2.4m/s
01:0013%2.5m/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 06:53 Sunset 20:07
03:00
-9.1°C 5.8°C 4.2°C - 0% 0.52kPa
04:00
-11°C 5.6°C 4°C - 0% 0.55kPa
05:00
-12°C 5.5°C 3.8°C - 0% 0.57kPa
06:00
-13°C 5.3°C 3.6°C - 0% 0.57kPa
07:00
-14°C 5°C 3.5°C - 0% 0.57kPa
08:00
-12°C 4.5°C 4.7°C - 3% 0.61kPa
09:00
-12°C 4.5°C 7.2°C - 2% 0.77kPa
10:00
-12°C 4.7°C 8.4°C - 4% 0.87kPa
11:00
-12°C 5°C 9.3°C - 5% 0.93kPa
12:00
-11°C 5.4°C 10°C - 5% 0.97kPa
13:00
-9.3°C 5.7°C 10°C - 5% 0.96kPa
14:00
-8.4°C 7.3°C 11°C - 0% 0.96kPa
15:00
-7.6°C 8.8°C 11°C - 0% 0.95kPa
16:00
-6.5°C 9.9°C 10°C - 5% 0.89kPa
17:00
-5.5°C 11°C 10°C - 18% 0.82kPa
18:00
-4.7°C 11°C 9.3°C - 8% 0.74kPa
19:00
-3°C 10°C 8.1°C - 5% 0.59kPa
20:00
-1.6°C 9.7°C 5.8°C - 64% 0.38kPa
21:00
-1.5°C 8.7°C 4.8°C - 100% 0.31kPa
22:00
-1.3°C 7.9°C 4.1°C - 78% 0.26kPa
23:00
-1.2°C 7°C 3.5°C - 27% 0.22kPa
Fri, Apr 10 Sunrise 06:53 Sunset 20:07
24:00
-2.1°C 6.8°C 3°C - 5% 0.23kPa
01:00
-4.1°C 6.5°C 2.7°C - 5% 0.29kPa
02:00
-6.1°C 6.3°C 2.6°C - 85% 0.35kPa
03:00
-7.2°C 6.2°C 2.5°C - 50% 0.37kPa
04:00
-6.9°C 5.9°C 2.3°C - 21% 0.36kPa
05:00
-6.7°C 5.5°C 2.3°C - 100% 0.35kPa
06:00
-7°C 4.9°C 2.3°C - 100% 0.36kPa
07:00
-7°C 4.3°C 2.5°C - 57% 0.37kPa
08:00
-6.4°C 3.9°C 3.4°C - 16% 0.4kPa
09:00
-9.4°C 4°C 5.7°C - 100% 0.62kPa
10:00
-9.7°C 4.2°C 7.1°C - 100% 0.72kPa
11:00
-8.7°C 4.4°C 7.9°C - 100% 0.75kPa
12:00
-7.5°C 4.7°C 8.3°C - 100% 0.75kPa
13:00
-6.2°C 5.5°C 8.8°C - 100% 0.75kPa
14:00
-5.4°C 7.1°C 9.2°C - 99% 0.75kPa
15:00
-4.3°C 8.4°C 9.5°C - 80% 0.74kPa
16:00
-3.5°C 9.6°C 9.4°C - 40% 0.71kPa
17:00
-3.1°C 10°C 9°C - 59% 0.66kPa
18:00
-2.6°C 10°C 8.4°C - 79% 0.6kPa
19:00
-2°C 10°C 7.6°C - 36% 0.51kPa
20:00
-0.9°C 9.5°C 5.5°C - 23% 0.33kPa
21:00
-1.2°C 8.6°C 4.4°C - 64% 0.27kPa
22:00
-2°C 7.8°C 4°C - 42% 0.29kPa
23:00
-2.9°C 7°C 3.5°C - 33% 0.29kPa
Sat, Apr 11 Sunrise 06:51 Sunset 20:08
24:00
-3.6°C 6.5°C 3°C - 33% 0.29kPa
01:00
-4.1°C 6.3°C 2.8°C - 20% 0.3kPa
02:00
-4.1°C 6.1°C 2.6°C - 99% 0.29kPa
03:00
-4.2°C 5.8°C 2.7°C - 100% 0.29kPa
04:00
-4.2°C 5.2°C 2.8°C - 100% 0.3kPa
05:00
-4.5°C 5°C 2.5°C - 100% 0.29kPa
06:00
-4.9°C 4.9°C 2.2°C - 10% 0.29kPa
07:00
-5.3°C 4.7°C 2°C - 7% 0.29kPa
08:00
-4.5°C 4.3°C 3.7°C - 5% 0.36kPa
09:00
-2.3°C 6.3°C 4.9°C - 36% 0.35kPa
10:00
-0.2°C 8.3°C 6.2°C - 68% 0.34kPa
11:00
1.9°C 10°C 7.4°C - 100% 0.33kPa
12:00
2.5°C 10°C 6.3°C - 100% 0.22kPa
13:00
2.9°C 9.7°C 5.1°C - 100% 0.13kPa
14:00
3.2°C 9.4°C 4°C - 100% 0.04kPa
15:00
2.9°C 8.8°C 3.6°C - 100% 0.04kPa
16:00
2.6°C 8.3°C 3.1°C - 100% 0.03kPa
17:00
2.3°C 7.7°C 2.7°C - 100% 0.02kPa
18:00
1.9°C 7.3°C 2.5°C - 100% 0.03kPa
19:00
1.5°C 6.8°C 2.4°C - 100% 0.04kPa
20:00
1.1°C 6.4°C 2.2°C - 100% 0.05kPa
21:00
1.2°C 6°C 2°C - 100% 0.04kPa
22:00
1.3°C 5.6°C 1.8°C - 100% 0.02kPa
23:00
1.4°C 5.3°C 1.6°C - 100% 0.01kPa
Sun, Apr 12 Sunrise 06:49 Sunset 20:09
24:00
1.3°C 5°C 1.5°C - 100% 0.01kPa
01:00
1.2°C 4.7°C 1.4°C - 100% 0.01kPa
02:00
1.1°C 4.4°C 1.3°C - 100% 0.01kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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