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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 97% failing
Time Window 83% failing
Frost Probability 61% failing

Currently

Real-time conditions
Soil Temperature0.6°C
Dew Point-4.3°C (low dew point)
Wind Speed2.3m/s (calm conditions)
Cloud Cover58%

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
4matching hours in the next 95 hoursJump to next match
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
Fri, Apr 17
15:0073%1.2m/s
16:0073%1.6m/s
17:0071%1.9m/s
18:0067%2.2m/s
19:0062%2.4m/s
20:0055%2.3m/s
21:0058%1.9m/s
22:0062%1.8m/s
23:0064%1.6m/s
Sat, Apr 18
24:0079%1.1m/s
01:0081%0.41m/s
02:0081%0.23m/s
03:0069%0.25m/s
04:0077%0.29m/s
05:0070%0.25m/s
06:0073%0.3m/s
07:0073%0.72m/s
08:0066%0.63m/s
09:0075%0.39m/s
10:0075%0.63m/s
11:0073%1m/s
12:0070%1.2m/s
13:0080%1.6m/s
14:0076%1.9m/s
15:0073%2.3m/s
16:0057%3m/s
17:0042%3.3m/s
18:0044%3.3m/s
19:0044%3.1m/s
20:0037%2.6m/s
21:0026%2.1m/s
22:0026%2m/s
23:0027%2.1m/s
Sun, Apr 19
24:0033%1.9m/s
01:0033%1.7m/s
02:0035%1.6m/s
03:0026%1.7m/s
04:0029%1.7m/s
05:0045%2.3m/s
06:0045%2.8m/s
07:0039%3.1m/s
08:0043%3.1m/s
09:0050%3.3m/s
10:0050%3.5m/s
11:0051%3.5m/s
12:0059%3.4m/s
13:0070%3.7m/s
14:0074%4m/s
15:0059%4.1m/s
16:0057%4.4m/s
17:0052%4.2m/s
18:0052%4.1m/s
19:0052%3.8m/s
20:0043%3.3m/s
21:0024%2.9m/s
22:0023%2.7m/s
23:0030%2.6m/s
Mon, Apr 20
24:0034%2.2m/s
01:0045%1.7m/s
02:0043%1.3m/s
03:0039%1.4m/s
04:0051%1.7m/s
05:0049%2m/s
06:0056%2.1m/s
07:0067%2.2m/s
08:0071%2.2m/s
09:0074%2.1m/s
10:0074%2.1m/s
11:0072%2.1m/s
12:0072%2.1m/s
13:0072%2.2m/s
14:0072%2.5m/s
15:0070%2.9m/s
16:0070%3.3m/s
17:0047%3.6m/s
18:0042%3.6m/s
19:0045%3.6m/s
20:0042%3.3m/s
21:0061%3.1m/s
22:0069%3m/s
23:0079%2.8m/s
Tue, Apr 21
24:0081%2.8m/s
01:0086%2.8m/s
02:0086%2.7m/s
03:0082%2.8m/s
04:0082%2.9m/s
05:0076%3m/s
06:0076%3.2m/s
07:0076%3.4m/s
08:0076%3.6m/s
09:0066%3.7m/s
10:0070%3.7m/s
11:0055%3.8m/s
12:0059%3.4m/s
13:0059%3.1m/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
Sat, Apr 18 Sunrise 06:37 Sunset 20:19
15:00
-4.3°C 0.65°C 5.1°C - 58% 0.43kPa
16:00
-4.3°C 1.4°C 5°C - 99% 0.43kPa
17:00
-4.4°C 2.3°C 4.6°C - 97% 0.41kPa
18:00
-4.1°C 2.7°C 4°C - 100% 0.36kPa
19:00
-3°C 2.8°C 3.1°C - 100% 0.27kPa
20:00
-2.1°C 2.6°C 1.1°C - 100% 0.14kPa
21:00
-2.1°C 2.5°C 0.05°C - 100% 0.09kPa
22:00
-1.9°C 2.4°C -0.05°C - 95% 0.08kPa
23:00
-2.3°C 2.3°C -0.44°C - 75% 0.07kPa
Sun, Apr 19 Sunrise 06:37 Sunset 20:19
24:00
-2.6°C 2.3°C -0.85°C - 32% 0.07kPa
01:00
-2.9°C 2.3°C -0.99°C - 29% 0.07kPa
02:00
-3.4°C 2.3°C -1.1°C - 39% 0.09kPa
03:00
-3.6°C 2.3°C -1.1°C - 100% 0.1kPa
04:00
-3.3°C 2.2°C -0.54°C - 100% 0.11kPa
05:00
-3.3°C 2°C -0.61°C - 70% 0.11kPa
06:00
-3.4°C 1.9°C -1.3°C - 53% 0.08kPa
07:00
-3.4°C 1.9°C -1.5°C - 89% 0.07kPa
08:00
-3.3°C 1.6°C -0.42°C - 72% 0.11kPa
09:00
-4.1°C 1.7°C 0.45°C - 83% 0.18kPa
10:00
-4.1°C 1.7°C 0.66°C - 90% 0.19kPa
11:00
-3.2°C 1.7°C 0.42°C - 80% 0.15kPa
12:00
-3.6°C 1.7°C 1.5°C - 50% 0.21kPa
13:00
-4.2°C 1.7°C 2.1°C - 13% 0.26kPa
14:00
-5.1°C 1.9°C 2.6°C - 5% 0.32kPa
15:00
-6.4°C 2.1°C 2.7°C - 3% 0.36kPa
16:00
-6.8°C 2.8°C 2.5°C - 3% 0.36kPa
17:00
-7.7°C 3.5°C 2.1°C - 5% 0.37kPa
18:00
-8°C 3.8°C 1.6°C - 2% 0.35kPa
19:00
-7.6°C 3.6°C 0.67°C - 5% 0.3kPa
20:00
-6.1°C 3.4°C -0.83°C - 9% 0.19kPa
21:00
-5°C 3.3°C -2.1°C - 29% 0.1kPa
22:00
-4.6°C 3.3°C -2.5°C - 40% 0.07kPa
23:00
-4.9°C 3.3°C -2.8°C - 13% 0.07kPa
Mon, Apr 20 Sunrise 06:36 Sunset 20:20
24:00
-5.8°C 3.3°C -2.9°C - 6% 0.09kPa
01:00
-6.8°C 3.3°C -3°C - 8% 0.12kPa
02:00
-7.8°C 3.3°C -3.1°C - 16% 0.15kPa
03:00
-9°C 3.3°C -3.1°C - 27% 0.18kPa
04:00
-9.9°C 3.1°C -3.1°C - 5% 0.2kPa
05:00
-10°C 3°C -3.4°C - 4% 0.19kPa
06:00
-9.8°C 2.5°C -3.7°C - 2% 0.17kPa
07:00
-9°C 1.8°C -3.8°C - 2% 0.15kPa
08:00
-9.6°C 1.3°C -2.8°C - 4% 0.2kPa
09:00
-12°C 1.3°C -1.4°C - 9% 0.31kPa
10:00
-13°C 1.3°C -0.23°C - 5% 0.39kPa
11:00
-14°C 1.3°C 0.77°C - 1% 0.43kPa
12:00
-13°C 1.3°C 1.5°C - 1% 0.45kPa
13:00
-12°C 1.3°C 2°C - 2% 0.46kPa
14:00
-12°C 1.3°C 2.4°C - 2% 0.47kPa
15:00
-12°C 1.4°C 2.6°C - 1% 0.48kPa
16:00
-11°C 1.7°C 2.5°C - 3% 0.47kPa
17:00
-10°C 2.4°C 2.2°C - 32% 0.44kPa
18:00
-8.6°C 2.9°C 1.6°C - 98% 0.37kPa
19:00
-6.9°C 2.8°C 0.53°C - 75% 0.27kPa
20:00
-5.4°C 2.6°C -1.2°C - 26% 0.15kPa
21:00
-7.6°C 2°C -2.4°C - 18% 0.17kPa
22:00
-9.9°C 1.4°C -3.6°C - 9% 0.18kPa
23:00
-12°C 0.82°C -4.7°C - 0% 0.19kPa
Tue, Apr 21 Sunrise 06:34 Sunset 20:22
24:00
-12°C 0.75°C -4.2°C - 3% 0.2kPa
01:00
-12°C 0.68°C -3.6°C - 7% 0.22kPa
02:00
-12°C 0.6°C -3°C - 10% 0.24kPa
03:00
-13°C 0.62°C -1.6°C - 8% 0.31kPa
04:00
-15°C 0.65°C -0.28°C - 7% 0.4kPa
05:00
-17°C 0.67°C 1.1°C - 5% 0.5kPa
06:00
-17°C 0.67°C 1.7°C - 5% 0.53kPa
07:00
-16°C 0.67°C 2.4°C - 5% 0.55kPa
08:00
-15°C 0.67°C 3°C - 5% 0.57kPa
09:00
-13°C 1.3°C 2.8°C - 4% 0.53kPa
10:00
-12°C 2°C 2.6°C - 2% 0.49kPa
11:00
-11°C 2.6°C 2.4°C - 1% 0.46kPa
12:00
-8.3°C 2.8°C 0.99°C - 2% 0.33kPa
13:00
-6.8°C 2.9°C -0.44°C - 3% 0.22kPa
14:00
-5.7°C 3°C -1.9°C - 5% 0.13kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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