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Rule Morning Frost

Matterhorn - Morning Frost - Alps

Zermatt, 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)
Wind Speed 99% failing
Time Window 88% failing
Frost Probability 31% failing

Currently

Real-time conditions
Soil Temperature0.2°C
Dew Point-11.8°C (low dew point)
Wind Speed2.3m/s (calm conditions)
Cloud Cover0%

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 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
06:0089%2.4m/s
07:0089%2.2m/s
08:0089%2m/s
09:0091%1.3m/s
10:0089%0.44m/s
11:0089%0.22m/s
12:0089%0.23m/s
13:0089%0.27m/s
14:0086%0.75m/s
15:0086%0.82m/s
16:0088%1.6m/s
17:0086%2.1m/s
18:0082%2.3m/s
19:0069%2.5m/s
20:0064%2.9m/s
21:0066%2.6m/s
22:0066%2.6m/s
23:0077%2.6m/s
Thu, Apr 9
24:0077%2.3m/s
01:0082%2.2m/s
02:0086%2.1m/s
03:0084%2.3m/s
04:0084%2.6m/s
05:0082%2.9m/s
06:0082%3.1m/s
07:0082%3m/s
08:0085%3m/s
09:0083%3m/s
10:0079%3m/s
11:0079%2.8m/s
12:0076%2.9m/s
13:0079%3.2m/s
14:0080%3.4m/s
15:0080%3.6m/s
16:0080%3.8m/s
17:0084%3.8m/s
18:0084%4m/s
19:0080%3.7m/s
20:0071%3.8m/s
21:0049%3.6m/s
22:0050%4m/s
23:0064%3.6m/s
Fri, Apr 10
24:0064%3.9m/s
01:0075%3.5m/s
02:0071%3.9m/s
03:0073%4.5m/s
04:0060%4.1m/s
05:0047%4.2m/s
06:0049%4.1m/s
07:0056%4.2m/s
08:0064%3.8m/s
09:0067%3.9m/s
10:0065%3.8m/s
11:0065%4m/s
12:0065%3.9m/s
13:0065%4m/s
14:0069%3.9m/s
15:0070%4m/s
16:0069%4m/s
17:0069%3.8m/s
18:0070%3.7m/s
19:0069%3.3m/s
20:0064%3.1m/s
21:0049%3m/s
22:0073%2.6m/s
23:0073%2.4m/s
Sat, Apr 11
24:0075%2m/s
01:0072%2.2m/s
02:0071%2.2m/s
03:0071%2.4m/s
04:0071%2.5m/s
05:0071%2.4m/s
06:0086%2.5m/s
07:0086%2.5m/s
08:0086%2.4m/s
09:0066%2.5m/s
10:0043%2.6m/s
11:0035%2.7m/s
12:0039%2.2m/s
13:0037%1.7m/s
14:0032%1.2m/s
15:0022%2m/s
16:0019%2.7m/s
17:0024%3.4m/s
18:0020%3.4m/s
19:0020%3.4m/s
20:0020%3.4m/s
21:0035%3.6m/s
22:0035%3.8m/s
23:0035%3.9m/s
Sun, Apr 12
24:0035%4m/s
01:0035%4m/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 06:54 Sunset 20:07
03:00
-12°C 0.23°C -0.65°C - 0% 0.34kPa
04:00
-13°C 0.23°C -0.8°C - 0% 0.35kPa
05:00
-13°C 0.23°C -0.79°C - 0% 0.35kPa
06:00
-12°C 0.23°C -0.89°C - 0% 0.34kPa
07:00
-12°C 0.12°C -1°C - 0% 0.32kPa
08:00
-11°C -0.35°C -0.003°C - 0% 0.35kPa
09:00
-11°C -0.37°C 1.6°C - 0% 0.42kPa
10:00
-12°C -0.37°C 3.1°C - 0% 0.53kPa
11:00
-13°C -0.35°C 4°C - 1% 0.59kPa
12:00
-12°C -0.25°C 4.6°C - 3% 0.61kPa
13:00
-11°C -0.05°C 4.8°C - 4% 0.6kPa
14:00
-9.4°C 0.09°C 4.9°C - 0% 0.56kPa
15:00
-7.9°C 0.19°C 4.8°C - 0% 0.52kPa
16:00
-6.7°C 0.39°C 4.4°C - 2% 0.46kPa
17:00
-5.6°C 0.57°C 3.9°C - 6% 0.4kPa
18:00
-4.6°C 0.67°C 3.2°C - 6% 0.34kPa
19:00
-3.1°C 0.67°C 2.1°C - 5% 0.22kPa
20:00
-3.1°C 0.67°C -0.07°C - 19% 0.12kPa
21:00
-3°C 0.6°C -0.93°C - 100% 0.08kPa
22:00
-2.9°C 0.6°C -1.3°C - 66% 0.06kPa
23:00
-3.3°C 0.6°C -1.6°C - 6% 0.06kPa
Fri, Apr 10 Sunrise 06:54 Sunset 20:07
24:00
-4.5°C 0.6°C -1.8°C - 4% 0.1kPa
01:00
-6.1°C 0.6°C -2.1°C - 6% 0.13kPa
02:00
-7.1°C 0.6°C -2°C - 20% 0.17kPa
03:00
-6.7°C 0.6°C -2.1°C - 6% 0.15kPa
04:00
-5°C 0.6°C -2.2°C - 21% 0.1kPa
05:00
-4.8°C 0.57°C -2.1°C - 100% 0.1kPa
06:00
-4.9°C 0.5°C -2.2°C - 100% 0.1kPa
07:00
-4.9°C 0.42°C -1.9°C - 57% 0.11kPa
08:00
-5.4°C 0.24°C -1.2°C - 46% 0.15kPa
09:00
-9.8°C 0.22°C 0.24°C - 100% 0.33kPa
10:00
-11°C 0.17°C 1.4°C - 100% 0.41kPa
11:00
-9.7°C 0.17°C 2.3°C - 100% 0.43kPa
12:00
-8.3°C 0.17°C 2.8°C - 100% 0.42kPa
13:00
-7.2°C 0.17°C 3.2°C - 100% 0.41kPa
14:00
-6.2°C 0.27°C 3.5°C - 98% 0.4kPa
15:00
-5.3°C 0.37°C 3.6°C - 68% 0.37kPa
16:00
-4.6°C 0.47°C 3.4°C - 93% 0.35kPa
17:00
-4.5°C 0.77°C 3°C - 81% 0.32kPa
18:00
-4.5°C 0.87°C 2.6°C - 79% 0.3kPa
19:00
-4.1°C 0.87°C 1.8°C - 56% 0.24kPa
20:00
-3.5°C 0.87°C -0.24°C - 50% 0.13kPa
21:00
-3.6°C 0.77°C -0.94°C - 94% 0.1kPa
22:00
-4.4°C 0.79°C -0.85°C - 21% 0.13kPa
23:00
-5.7°C 0.79°C -0.92°C - 10% 0.17kPa
Sat, Apr 11 Sunrise 06:52 Sunset 20:09
24:00
-7°C 0.79°C -0.91°C - 43% 0.21kPa
01:00
-7.6°C 0.79°C -0.71°C - 64% 0.23kPa
02:00
-8°C 0.79°C -0.61°C - 100% 0.25kPa
03:00
-8.5°C 0.76°C -0.53°C - 100% 0.27kPa
04:00
-9°C 0.73°C -0.53°C - 100% 0.28kPa
05:00
-9.5°C 0.71°C -0.54°C - 85% 0.29kPa
06:00
-9.8°C 0.7°C -0.74°C - 5% 0.29kPa
07:00
-9.8°C 0.67°C -0.92°C - 5% 0.28kPa
08:00
-9.3°C 0.52°C 0.4°C - 0% 0.33kPa
09:00
-7.9°C 1.4°C 2.4°C - 33% 0.39kPa
10:00
-6.6°C 2.3°C 4.4°C - 67% 0.46kPa
11:00
-5.2°C 3.2°C 6.4°C - 100% 0.55kPa
12:00
-3.7°C 3.3°C 4.8°C - 100% 0.39kPa
13:00
-2.8°C 3.4°C 3.2°C - 100% 0.27kPa
14:00
-2.2°C 3.5°C 1.6°C - 100% 0.17kPa
15:00
-1.4°C 3.3°C 1.4°C - 100% 0.13kPa
16:00
-0.7°C 3.1°C 1.2°C - 100% 0.09kPa
17:00
-0.1°C 2.9°C 1°C - 100% 0.05kPa
18:00
-0.5°C 2.6°C 0.47°C - 97% 0.04kPa
19:00
-1°C 2.4°C -0.06°C - 93% 0.04kPa
20:00
-1.5°C 2.1°C -0.59°C - 90% 0.04kPa
21:00
-1.7°C 2°C -0.82°C - 93% 0.03kPa
22:00
-1.8°C 1.8°C -1.1°C - 97% 0.03kPa
23:00
-2°C 1.6°C -1.3°C - 100% 0.03kPa
Sun, Apr 12 Sunrise 06:50 Sunset 20:10
24:00
-1.8°C 1.5°C -0.99°C - 100% 0.03kPa
01:00
-1.5°C 1.5°C -0.69°C - 100% 0.03kPa
02:00
-1.3°C 1.4°C -0.39°C - 100% 0.04kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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