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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 83% failing
Wind Speed 75% failing

Currently

Real-time conditions
Soil Temperature10.9°C
Dew Point7.3°C (moderate dew point)
Wind Speed2.5m/s (calm conditions)
Cloud Cover99%

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 95 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, Jun 7
16:000%1.6m/s
17:000%1.6m/s
18:000%1.6m/s
19:000%1.4m/s
20:000%1.1m/s
21:000%2m/s
22:000%1.9m/s
23:000%0.85m/s
Mon, Jun 8
24:000%0.28m/s
01:000%0.33m/s
02:000%1.2m/s
03:000%1.7m/s
04:000%1.9m/s
05:002.6%1.8m/s
06:002.5%1.5m/s
07:002.1%1.2m/s
08:003.4%1.3m/s
09:003.6%1.9m/s
10:000%2m/s
11:000%2.5m/s
12:000%2.7m/s
13:000%2.8m/s
14:000%2.8m/s
15:000%2.4m/s
16:000%2.5m/s
17:000%2.5m/s
18:000%2.1m/s
19:000%1.3m/s
20:000%1.3m/s
21:000%1.4m/s
22:000%2.2m/s
23:000%2m/s
Tue, Jun 9
24:000%2m/s
01:000%1.5m/s
02:000%1.5m/s
03:000%1.5m/s
04:000%1.6m/s
05:000%1.9m/s
06:000%2.2m/s
07:000%1.6m/s
08:000%0.61m/s
09:000%1.3m/s
10:000%1.8m/s
11:000%2.1m/s
12:000%2.7m/s
13:000%2.7m/s
14:000%1.9m/s
15:000%1.8m/s
16:000%1.7m/s
17:000%1.4m/s
18:000%0.8m/s
19:000%0.74m/s
20:000%1.1m/s
21:000%1.1m/s
22:000%1.4m/s
23:000%1.5m/s
Wed, Jun 10
24:000%1.5m/s
01:000%1.2m/s
02:000%1m/s
03:000%1.4m/s
04:000%2.2m/s
05:000%3.3m/s
06:000%3.7m/s
07:000%3m/s
08:000%1.1m/s
09:000%1.2m/s
10:000%2.3m/s
11:000%2.4m/s
12:000%1.9m/s
13:000%2.3m/s
14:000%2.4m/s
15:000%2.7m/s
16:000%3.1m/s
17:000%3.9m/s
18:000%4m/s
19:000%4.2m/s
20:000%4.4m/s
21:000%4.7m/s
22:000%5.2m/s
23:000%5m/s
Thu, Jun 11
24:000%5.3m/s
01:000%5.4m/s
02:000%5.2m/s
03:000%4.2m/s
04:003.9%3.2m/s
05:004.4%2.2m/s
06:004.4%2.3m/s
07:004.4%2.4m/s
08:004.2%2.5m/s
09:000%2.7m/s
10:000%2.8m/s
11:000%3m/s
12:000%2.9m/s
13:000%2.9m/s
14:000%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
Mon, Jun 8 Sunrise 05:37 Sunset 21:17
16:00
7.3°C 11°C 12°C - 99% 0.35kPa
17:00
7.3°C 11°C 11°C - 95% 0.32kPa
18:00
7.5°C 11°C 11°C - 92% 0.25kPa
19:00
7.3°C 12°C 10°C - 100% 0.24kPa
20:00
6.7°C 11°C 9.9°C - 78% 0.24kPa
21:00
6.1°C 11°C 8.4°C - 100% 0.16kPa
22:00
5.4°C 11°C 8.2°C - 100% 0.19kPa
23:00
5°C 11°C 8°C - 100% 0.2kPa
Tue, Jun 9 Sunrise 05:37 Sunset 21:17
24:00
4.6°C 10°C 7.9°C - 100% 0.21kPa
01:00
4.4°C 10°C 7.2°C - 100% 0.18kPa
02:00
3.5°C 9.9°C 6.1°C - 91% 0.15kPa
03:00
3°C 9.5°C 5.6°C - 51% 0.15kPa
04:00
3°C 9.2°C 5.8°C - 25% 0.17kPa
05:00
2.4°C 8.8°C 5.5°C - 100% 0.17kPa
06:00
2.4°C 8.4°C 5.3°C - 59% 0.16kPa
07:00
4.2°C 8.2°C 7.4°C - 80% 0.2kPa
08:00
4.1°C 8.3°C 8.8°C - 100% 0.32kPa
09:00
4.9°C 8.5°C 9.6°C - 100% 0.33kPa
10:00
5.5°C 9°C 10°C - 32% 0.33kPa
11:00
6°C 9.4°C 11°C - 68% 0.34kPa
12:00
6.9°C 9.9°C 11°C - 74% 0.3kPa
13:00
7.5°C 10°C 11°C - 85% 0.26kPa
14:00
7.2°C 11°C 9.9°C - 98% 0.21kPa
15:00
7.3°C 11°C 10°C - 100% 0.23kPa
16:00
7.5°C 11°C 10°C - 100% 0.21kPa
17:00
7.5°C 11°C 10°C - 99% 0.19kPa
18:00
7°C 11°C 9.6°C - 100% 0.19kPa
19:00
6.6°C 11°C 9.3°C - 100% 0.19kPa
20:00
6.4°C 11°C 8.5°C - 98% 0.15kPa
21:00
5.6°C 11°C 6.6°C - 99% 0.07kPa
22:00
4.1°C 11°C 5.4°C - 100% 0.08kPa
23:00
3.1°C 10°C 4.8°C - 83% 0.1kPa
Wed, Jun 10 Sunrise 05:37 Sunset 21:17
24:00
2.5°C 10°C 4.6°C - 26% 0.12kPa
01:00
1.9°C 9.6°C 4.1°C - 48% 0.12kPa
02:00
1.7°C 9.4°C 3.9°C - 36% 0.12kPa
03:00
1.9°C 9.4°C 4.3°C - 89% 0.13kPa
04:00
1.7°C 9.1°C 4.4°C - 60% 0.15kPa
05:00
1°C 8.8°C 3.5°C - 61% 0.13kPa
06:00
0.8°C 8.4°C 3.4°C - 42% 0.13kPa
07:00
2°C 8.2°C 4.8°C - 15% 0.16kPa
08:00
1.3°C 8.2°C 6.5°C - 13% 0.29kPa
09:00
1.6°C 8.3°C 7.5°C - 11% 0.35kPa
10:00
2.5°C 8.4°C 8.4°C - 66% 0.37kPa
11:00
3.6°C 8.5°C 8.4°C - 97% 0.31kPa
12:00
3.7°C 8.5°C 7.5°C - 99% 0.24kPa
13:00
4.1°C 8.5°C 7.4°C - 100% 0.21kPa
14:00
3.7°C 8.8°C 7.5°C - 47% 0.24kPa
15:00
3.2°C 9.2°C 8°C - 44% 0.3kPa
16:00
2.9°C 9.5°C 8.4°C - 53% 0.35kPa
17:00
2.8°C 9.6°C 7.4°C - 77% 0.28kPa
18:00
2°C 9.6°C 6.4°C - 48% 0.25kPa
19:00
1.3°C 9.6°C 5.9°C - 14% 0.26kPa
20:00
-0.3°C 9.4°C 4.9°C - 12% 0.26kPa
21:00
-1.6°C 9.1°C 2.6°C - 57% 0.19kPa
22:00
-2.5°C 9°C 1.2°C - 99% 0.16kPa
23:00
-2.6°C 8.9°C 1.2°C - 19% 0.17kPa
Thu, Jun 11 Sunrise 05:37 Sunset 21:18
24:00
-3.2°C 8.9°C 0.85°C - 61% 0.17kPa
01:00
-3.8°C 8.7°C 0.65°C - 100% 0.18kPa
02:00
-4.1°C 8.7°C 1.1°C - 100% 0.21kPa
03:00
-4°C 8.2°C 3.4°C - 69% 0.33kPa
04:00
-4.3°C 7.8°C 5.6°C - 38% 0.47kPa
05:00
-5.2°C 7.4°C 7.9°C - 7% 0.65kPa
06:00
-4.9°C 7.5°C 8.7°C - 6% 0.7kPa
07:00
-4.6°C 7.6°C 9.6°C - 6% 0.76kPa
08:00
-4.3°C 7.8°C 10°C - 5% 0.82kPa
09:00
-4.1°C 8.1°C 10°C - 8% 0.82kPa
10:00
-3.9°C 8.4°C 11°C - 10% 0.82kPa
11:00
-3.7°C 8.7°C 11°C - 12% 0.82kPa
12:00
-2.5°C 8.8°C 9.8°C - 34% 0.7kPa
13:00
-1.5°C 9°C 8.8°C - 57% 0.59kPa
14:00
-0.8°C 9.1°C 7.8°C - 79% 0.48kPa
15:00
-1.5°C 8.9°C 6.1°C - 62% 0.4kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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