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Rule Morning Frost

Saas-Fee - Morning Frost - Alps

Saas-Fee, Valais, Switzerland

Frost crystals on calm, cold mornings near sunrise

No opportunities right now
Here’s what usually blocks matches

No Morning Frost opportunities in the next 14 days

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Rule requirements (key thresholds)
Time Window · Sunrise -45m to +90m Frost Probability · ≥ 60.0% Wind Speed · ≤ 1.5m/s

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)
Frost Probability 100% failing
Time Window 86% failing
Wind Speed 64% failing

Currently

Real-time conditions
Soil Temperature12.7°C
Dew Point6.1°C (moderate dew point)
Wind Speed3.2m/s (calm conditions)
Cloud Cover1%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

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 80 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
Sun, May 24
06:000%0.26m/s
07:000%0.97m/s
08:000%0.8m/s
09:000%1.2m/s
10:000%2m/s
11:000%2.6m/s
12:000%2.8m/s
13:000%3.1m/s
14:000%3m/s
15:000%3.2m/s
16:000%3m/s
17:000%3m/s
18:000%2.9m/s
19:000%1.4m/s
20:000%0.98m/s
21:000%0.5m/s
22:000%1.7m/s
23:000%1.2m/s
Mon, May 25
24:000%0.87m/s
01:000%1.4m/s
02:000%0.97m/s
03:000%1.1m/s
04:000%1.2m/s
05:000%1.3m/s
06:000%1.4m/s
07:000%0.77m/s
08:000%0.66m/s
09:000%1.5m/s
10:000%2.1m/s
11:000%2.4m/s
12:000%3.1m/s
13:000%2.8m/s
14:000%2.2m/s
15:000%1.7m/s
16:000%1.9m/s
17:000%2.1m/s
18:000%1.7m/s
19:000%1.5m/s
20:000%0.96m/s
21:000%2.6m/s
22:000%1.6m/s
23:000%0.5m/s
Tue, May 26
24:000%0.54m/s
01:000%0.92m/s
02:000%1.1m/s
03:000%1.6m/s
04:000%1.6m/s
05:000%1.6m/s
06:000%1.4m/s
07:000%1.2m/s
08:000%0.4m/s
09:000%0.88m/s
10:000%1.7m/s
11:000%2.4m/s
12:000%2.4m/s
13:000%2.4m/s
14:000%2.1m/s
15:000%1.4m/s
16:000%0.78m/s
17:000%2.8m/s
18:000%1.8m/s
19:000%2.7m/s
20:000%1.7m/s
21:000%2.3m/s
22:000%2.8m/s
23:000%3.4m/s
Wed, May 27
24:000%2.9m/s
01:000%2.4m/s
02:000%1.9m/s
03:000%2m/s
04:000%2.1m/s
05:000%2.3m/s
06:000%2.2m/s
07:000%2m/s
08:000%1.9m/s
09:000%2.2m/s
10:000%2.4m/s
11:000%2.6m/s
12:000%2.6m/s
13:000%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
Sun, May 24 Sunrise 05:46 Sunset 21:03
15:00
6.1°C 13°C 15°C - 1% 0.81kPa
16:00
6.9°C 13°C 15°C - 3% 0.7kPa
17:00
7.6°C 14°C 15°C - 7% 0.62kPa
18:00
7.7°C 14°C 14°C - 9% 0.56kPa
19:00
8.5°C 14°C 13°C - 33% 0.37kPa
20:00
7.8°C 14°C 12°C - 48% 0.34kPa
21:00
5.8°C 13°C 8.7°C - 99% 0.2kPa
22:00
5.1°C 13°C 9°C - 100% 0.27kPa
23:00
4.3°C 12°C 9.1°C - 39% 0.33kPa
Mon, May 25 Sunrise 05:46 Sunset 21:03
24:00
4.1°C 12°C 8.1°C - 13% 0.26kPa
01:00
3.9°C 11°C 7.9°C - 91% 0.26kPa
02:00
4.1°C 11°C 7.9°C - 18% 0.25kPa
03:00
3.5°C 10°C 7.2°C - 43% 0.23kPa
04:00
3.3°C 10°C 7°C - 91% 0.23kPa
05:00
3.1°C 9.5°C 6.6°C - 14% 0.21kPa
06:00
3.2°C 9.1°C 6.7°C - 5% 0.21kPa
07:00
5.5°C 8.9°C 9.5°C - 5% 0.28kPa
08:00
5.5°C 9°C 11°C - 5% 0.42kPa
09:00
6.2°C 9.4°C 12°C - 5% 0.47kPa
10:00
6.9°C 9.9°C 13°C - 5% 0.5kPa
11:00
7.3°C 10°C 14°C - 17% 0.58kPa
12:00
7.9°C 11°C 15°C - 57% 0.64kPa
13:00
8.6°C 12°C 15°C - 92% 0.55kPa
14:00
8.7°C 12°C 14°C - 98% 0.51kPa
15:00
8.5°C 13°C 14°C - 90% 0.52kPa
16:00
8.5°C 13°C 15°C - 29% 0.57kPa
17:00
8.6°C 14°C 15°C - 64% 0.54kPa
18:00
8.8°C 14°C 14°C - 85% 0.49kPa
19:00
8.7°C 14°C 14°C - 98% 0.43kPa
20:00
9°C 14°C 12°C - 100% 0.29kPa
21:00
7.3°C 14°C 11°C - 100% 0.26kPa
22:00
6.7°C 13°C 10°C - 100% 0.25kPa
23:00
6.3°C 13°C 9.3°C - 100% 0.22kPa
Tue, May 26 Sunrise 05:46 Sunset 21:04
24:00
6.1°C 12°C 8.8°C - 100% 0.2kPa
01:00
5.9°C 12°C 8.6°C - 98% 0.19kPa
02:00
5.6°C 11°C 8.3°C - 55% 0.19kPa
03:00
5.5°C 11°C 8.4°C - 8% 0.2kPa
04:00
5.1°C 11°C 8.2°C - 5% 0.21kPa
05:00
4.7°C 10°C 8°C - 5% 0.21kPa
06:00
4.5°C 9.8°C 7.8°C - 1% 0.21kPa
07:00
6.6°C 9.7°C 11°C - 0% 0.29kPa
08:00
6.5°C 9.8°C 12°C - 0% 0.46kPa
09:00
7.1°C 10°C 13°C - 0% 0.5kPa
10:00
7.9°C 11°C 14°C - 3% 0.55kPa
11:00
8.9°C 11°C 15°C - 24% 0.54kPa
12:00
9.7°C 12°C 15°C - 68% 0.46kPa
13:00
9.9°C 12°C 15°C - 99% 0.48kPa
14:00
9.8°C 13°C 15°C - 100% 0.44kPa
15:00
9.6°C 13°C 14°C - 100% 0.37kPa
16:00
9.4°C 13°C 12°C - 100% 0.23kPa
17:00
9°C 12°C 12°C - 100% 0.25kPa
18:00
8.9°C 12°C 14°C - 100% 0.42kPa
19:00
8.8°C 12°C 13°C - 100% 0.38kPa
20:00
8.8°C 12°C 12°C - 100% 0.31kPa
21:00
7.3°C 12°C 11°C - 68% 0.3kPa
22:00
5.8°C 11°C 9.9°C - 37% 0.3kPa
23:00
4.2°C 10°C 8.6°C - 5% 0.29kPa
Wed, May 27 Sunrise 05:45 Sunset 21:06
24:00
4.9°C 10°C 10°C - 3% 0.36kPa
01:00
5.6°C 9.8°C 11°C - 2% 0.43kPa
02:00
6.2°C 9.7°C 13°C - 0% 0.5kPa
03:00
6.5°C 10°C 14°C - 2% 0.58kPa
04:00
6.8°C 11°C 14°C - 3% 0.66kPa
05:00
7.1°C 11°C 15°C - 5% 0.74kPa
06:00
7.4°C 12°C 16°C - 21% 0.74kPa
07:00
7.6°C 12°C 16°C - 37% 0.74kPa
08:00
7.9°C 13°C 16°C - 53% 0.73kPa
09:00
7.9°C 13°C 16°C - 51% 0.74kPa
10:00
8°C 14°C 16°C - 49% 0.76kPa
11:00
8°C 14°C 16°C - 47% 0.77kPa
12:00
8.6°C 14°C 15°C - 33% 0.61kPa
13:00
9.1°C 14°C 14°C - 19% 0.47kPa
14:00
9.4°C 14°C 13°C - 5% 0.34kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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