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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 88% failing
Wind Speed 82% failing

Currently

Real-time conditions
Soil Temperature14.7°C
Dew Point2.2°C (low dew point)
Wind Speed2.7m/s (calm conditions)
Cloud Cover100%

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 79 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, Jul 8
07:000%5.3m/s
08:000%4.2m/s
09:000%3.5m/s
10:000%3.2m/s
11:000%2.7m/s
12:000%2.4m/s
13:000%2.3m/s
14:000%2.4m/s
15:000%2.7m/s
16:000%2.9m/s
17:000%3.2m/s
18:000%3.3m/s
19:000%3.5m/s
20:000%3.8m/s
21:000%4.6m/s
22:000%5.1m/s
23:000%5m/s
Thu, Jul 9
24:000%4.9m/s
01:000%4.8m/s
02:000%4.4m/s
03:000%4.3m/s
04:000%4.1m/s
05:000%3.7m/s
06:000%3.3m/s
07:000%2.7m/s
08:000%1.1m/s
09:000%1.1m/s
10:000%2.1m/s
11:000%2.7m/s
12:000%3.1m/s
13:000%3.3m/s
14:000%3.2m/s
15:000%3.1m/s
16:000%2.8m/s
17:000%2.8m/s
18:000%2.7m/s
19:000%2m/s
20:000%1.7m/s
21:000%1.7m/s
22:000%2m/s
23:000%1.3m/s
Fri, Jul 10
24:000%0.23m/s
01:000%1.3m/s
02:000%1.9m/s
03:000%1.9m/s
04:000%1.2m/s
05:000%0.99m/s
06:000%0.93m/s
07:000%0.86m/s
08:000%1.1m/s
09:000%1.7m/s
10:000%2.4m/s
11:000%2.5m/s
12:000%2.6m/s
13:000%2.3m/s
14:000%2.2m/s
15:000%2m/s
16:000%2.6m/s
17:000%2.3m/s
18:000%2.7m/s
19:000%3m/s
20:000%1.8m/s
21:000%2m/s
22:000%2.3m/s
23:000%2.5m/s
Sat, Jul 11
24:000%1.8m/s
01:000%1m/s
02:000%0.28m/s
03:000%1m/s
04:000%1.7m/s
05:000%2.4m/s
06:000%2.2m/s
07:000%2m/s
08:000%1.8m/s
09:000%1.8m/s
10:000%1.8m/s
11:000%1.8m/s
12:000%2.6m/s
13:000%3.5m/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
Wed, Jul 8 Sunrise 05:45 Sunset 21:20
15:00
2.2°C 15°C 19°C - 100% 1.5kPa
16:00
2.4°C 15°C 19°C - 99% 1.5kPa
17:00
2.7°C 15°C 19°C - 85% 1.4kPa
18:00
3.3°C 16°C 18°C - 36% 1.3kPa
19:00
4.1°C 16°C 18°C - 16% 1.2kPa
20:00
5.8°C 16°C 16°C - 6% 0.86kPa
21:00
4.2°C 15°C 13°C - 18% 0.65kPa
22:00
3.3°C 15°C 11°C - 50% 0.57kPa
23:00
2.8°C 15°C 11°C - 5% 0.55kPa
Thu, Jul 9 Sunrise 05:45 Sunset 21:20
24:00
2.4°C 14°C 10°C - 5% 0.54kPa
01:00
2.3°C 14°C 10°C - 5% 0.52kPa
02:00
2.2°C 14°C 10°C - 5% 0.51kPa
03:00
2.1°C 13°C 9.9°C - 5% 0.51kPa
04:00
2.2°C 13°C 9.6°C - 5% 0.48kPa
05:00
1.9°C 13°C 9.2°C - 5% 0.46kPa
06:00
1.6°C 12°C 9°C - 6% 0.46kPa
07:00
3.5°C 12°C 11°C - 5% 0.53kPa
08:00
3°C 12°C 14°C - 5% 0.79kPa
09:00
3°C 12°C 15°C - 5% 0.94kPa
10:00
3.9°C 13°C 16°C - 5% 1kPa
11:00
4.8°C 13°C 17°C - 5% 1.1kPa
12:00
5.2°C 14°C 18°C - 0% 1.2kPa
13:00
5.7°C 14°C 19°C - 0% 1.3kPa
14:00
6°C 15°C 19°C - 0% 1.3kPa
15:00
6.5°C 15°C 19°C - 0% 1.3kPa
16:00
7.1°C 16°C 20°C - 11% 1.3kPa
17:00
7.9°C 16°C 19°C - 41% 1.2kPa
18:00
9.2°C 16°C 18°C - 21% 0.95kPa
19:00
10°C 16°C 17°C - 29% 0.68kPa
20:00
11°C 16°C 16°C - 37% 0.45kPa
21:00
9.8°C 16°C 13°C - 2% 0.27kPa
22:00
8.2°C 16°C 12°C - 1% 0.28kPa
23:00
7.5°C 15°C 11°C - 0% 0.26kPa
Fri, Jul 10 Sunrise 05:46 Sunset 21:19
24:00
7.2°C 15°C 10°C - 0% 0.22kPa
01:00
7.4°C 15°C 9.7°C - 5% 0.18kPa
02:00
7.8°C 14°C 9.8°C - 0% 0.15kPa
03:00
7.6°C 14°C 9.6°C - 0% 0.15kPa
04:00
6.8°C 13°C 8.9°C - 0% 0.15kPa
05:00
6.4°C 13°C 8.3°C - 0% 0.14kPa
06:00
6.2°C 13°C 8.1°C - 0% 0.13kPa
07:00
8.9°C 12°C 11°C - 0% 0.19kPa
08:00
9.1°C 12°C 13°C - 4% 0.3kPa
09:00
10°C 13°C 13°C - 11% 0.32kPa
10:00
11°C 13°C 14°C - 40% 0.29kPa
11:00
11°C 13°C 15°C - 100% 0.36kPa
12:00
11°C 14°C 15°C - 100% 0.38kPa
13:00
11°C 14°C 15°C - 100% 0.41kPa
14:00
11°C 14°C 15°C - 100% 0.42kPa
15:00
10°C 14°C 15°C - 100% 0.43kPa
16:00
10°C 14°C 13°C - 100% 0.27kPa
17:00
8.8°C 14°C 12°C - 100% 0.31kPa
18:00
8.3°C 14°C 14°C - 98% 0.5kPa
19:00
9.4°C 14°C 14°C - 100% 0.38kPa
20:00
9.3°C 14°C 12°C - 100% 0.25kPa
21:00
7.3°C 13°C 11°C - 84% 0.31kPa
22:00
5.2°C 12°C 10°C - 68% 0.36kPa
23:00
3°C 11°C 9.2°C - 51% 0.41kPa
Sat, Jul 11 Sunrise 05:47 Sunset 21:19
24:00
3.9°C 11°C 11°C - 36% 0.49kPa
01:00
4.6°C 11°C 12°C - 20% 0.6kPa
02:00
5.3°C 11°C 14°C - 5% 0.71kPa
03:00
5.9°C 11°C 15°C - 37% 0.76kPa
04:00
6.6°C 12°C 16°C - 68% 0.81kPa
05:00
7.2°C 12°C 17°C - 100% 0.87kPa
06:00
7.8°C 13°C 16°C - 100% 0.76kPa
07:00
8.2°C 13°C 15°C - 100% 0.66kPa
08:00
8.7°C 13°C 15°C - 100% 0.56kPa
09:00
8.6°C 13°C 15°C - 100% 0.57kPa
10:00
8.6°C 14°C 15°C - 100% 0.58kPa
11:00
8.6°C 14°C 15°C - 100% 0.59kPa
12:00
8.4°C 14°C 14°C - 100% 0.45kPa
13:00
8.1°C 14°C 12°C - 100% 0.32kPa
14:00
7.6°C 13°C 10°C - 100% 0.22kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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