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Rule Morning Frost

St. Moritz - Morning Frost - Alps

Saint Moritz, Canton Grisons, 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 94% failing
Wind Speed 90% failing
Time Window 88% failing

Currently

Real-time conditions
Soil Temperature3.7°C
Dew Point-1.4°C (low dew point)
Wind Speed2.1m/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 86 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
Sat, Apr 18
06:0036%1.1m/s
07:0036%1.1m/s
08:0048%0.66m/s
09:0059%1.1m/s
10:0055%1.3m/s
11:0052%1.5m/s
12:0046%1.8m/s
13:0044%2.1m/s
14:0037%2.6m/s
15:0037%3m/s
16:0046%2.6m/s
17:0046%2.8m/s
18:0041%2.8m/s
19:0040%2.5m/s
20:0028%2m/s
21:0030%2.1m/s
22:0030%2.1m/s
23:0026%1.9m/s
Sun, Apr 19
24:0026%1.8m/s
01:0028%1.5m/s
02:0028%0.83m/s
03:0030%0.47m/s
04:0030%0.13m/s
05:0030%0.31m/s
06:0031%1m/s
07:0043%1.2m/s
08:0041%1.7m/s
09:0041%2.2m/s
10:0041%2.5m/s
11:0039%3.3m/s
12:0024%3.1m/s
13:0024%3.3m/s
14:0021%3.3m/s
15:0033%3.3m/s
16:0046%3.5m/s
17:0050%3.4m/s
18:004.9%3.6m/s
19:0046%3.5m/s
20:0026%3.3m/s
21:0011%3m/s
22:0011%2.9m/s
23:0015%3m/s
Mon, Apr 20
24:0021%2.9m/s
01:0028%3m/s
02:0034%2.6m/s
03:0026%2.7m/s
04:0019%2.1m/s
05:0016%2.4m/s
06:0016%2.4m/s
07:0020%2.5m/s
08:0030%2.4m/s
09:0044%2.4m/s
10:0052%2.5m/s
11:0059%2.9m/s
12:0059%3.3m/s
13:0052%3.5m/s
14:0052%3.7m/s
15:0046%3.9m/s
16:0046%3.5m/s
17:0046%3.6m/s
18:004.7%3.4m/s
19:0050%3.3m/s
20:0050%3.6m/s
21:0026%3.5m/s
22:0011%3.3m/s
23:0015%3.5m/s
Tue, Apr 21
24:0015%3.4m/s
01:0016%3.5m/s
02:0024%3.7m/s
03:0035%3.2m/s
04:0057%2.7m/s
05:0072%2.3m/s
06:0068%2.4m/s
07:0068%2.5m/s
08:0068%2.6m/s
09:0047%3m/s
10:0036%3.4m/s
11:0033%3.7m/s
12:0040%3.6m/s
13:0042%3.4m/s
14:0048%3.3m/s
15:0039%3.1m/s
16:0039%2.8m/s
17:0030%2.6m/s
18:0034%1.9m/s
19:0036%1.2m/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 06:28 Sunset 20:12
21:00
-1.4°C 3.7°C 2.4°C - 100% 0.17kPa
22:00
-1°C 3.3°C 2°C - 100% 0.14kPa
23:00
-0.5°C 3°C 1.7°C - 100% 0.1kPa
Sun, Apr 19 Sunrise 06:28 Sunset 20:12
24:00
-0.2°C 2.7°C 1.5°C - 100% 0.07kPa
01:00
-0.2°C 2.5°C 1.1°C - 100% 0.06kPa
02:00
-0.7°C 2.5°C 0.65°C - 100% 0.06kPa
03:00
-0.7°C 2.5°C 0.93°C - 100% 0.07kPa
04:00
-0.9°C 2.4°C 0.9°C - 100% 0.08kPa
05:00
-0.9°C 2.2°C 1.3°C - 100% 0.1kPa
06:00
-0.7°C 2°C 1.7°C - 100% 0.11kPa
07:00
-0.3°C 1.8°C 1.8°C - 100% 0.1kPa
08:00
0.3°C 1.8°C 2.2°C - 100% 0.1kPa
09:00
0.8°C 1.7°C 2.7°C - 100% 0.09kPa
10:00
0.9°C 1.8°C 2.8°C - 86% 0.1kPa
11:00
1.2°C 1.8°C 3.1°C - 100% 0.09kPa
12:00
1.6°C 2.2°C 2.8°C - 100% 0.06kPa
13:00
1.5°C 2.9°C 2.8°C - 89% 0.07kPa
14:00
0.7°C 3.6°C 3.2°C - 80% 0.12kPa
15:00
0°C 4.5°C 4°C - 26% 0.2kPa
16:00
-0.9°C 5.4°C 4.6°C - 5% 0.27kPa
17:00
-1.9°C 6°C 4.3°C - 3% 0.3kPa
18:00
-2.2°C 6.1°C 3.9°C - 3% 0.29kPa
19:00
-1.9°C 5.9°C 2.8°C - 3% 0.22kPa
20:00
-0.6°C 5.3°C 1°C - 22% 0.07kPa
21:00
-0.6°C 5.1°C -0.26°C - 81% 0.01kPa
22:00
-1.4°C 4.5°C -0.58°C - 92% 0.03kPa
23:00
-2.4°C 4.1°C -0.83°C - 83% 0.06kPa
Mon, Apr 20 Sunrise 06:26 Sunset 20:13
24:00
-3.1°C 3.8°C -0.87°C - 41% 0.09kPa
01:00
-3.6°C 3.7°C -1.4°C - 16% 0.08kPa
02:00
-3.8°C 3.7°C -2.3°C - 5% 0.06kPa
03:00
-3.5°C 3.7°C -2.7°C - 22% 0.03kPa
04:00
-3.3°C 3.7°C -2.9°C - 57% 0.01kPa
05:00
-3.6°C 3.6°C -3.2°C - 68% 0.02kPa
06:00
-4.2°C 3.5°C -3.4°C - 69% 0.03kPa
07:00
-4.5°C 3.3°C -3.4°C - 61% 0.04kPa
08:00
-4.8°C 2.9°C -2.7°C - 47% 0.07kPa
09:00
-5.2°C 2.8°C -1.6°C - 26% 0.13kPa
10:00
-5.7°C 2.8°C -0.45°C - 5% 0.19kPa
11:00
-5.9°C 2.8°C 0.86°C - 5% 0.26kPa
12:00
-6°C 2.8°C 1.9°C - 5% 0.31kPa
13:00
-6.4°C 3.2°C 2.5°C - 2% 0.35kPa
14:00
-6.9°C 3.7°C 3°C - 1% 0.39kPa
15:00
-7.6°C 4.3°C 3.2°C - 2% 0.42kPa
16:00
-8.1°C 5.4°C 3.2°C - 2% 0.44kPa
17:00
-8.2°C 6°C 3.1°C - 4% 0.43kPa
18:00
-7.8°C 6.2°C 2.6°C - 2% 0.4kPa
19:00
-7.3°C 6°C 1.7°C - 5% 0.34kPa
20:00
-6°C 5.4°C 0.12°C - 5% 0.22kPa
21:00
-3.7°C 5.2°C -1.8°C - 24% 0.07kPa
22:00
-2.7°C 5.2°C -2.4°C - 81% 0.01kPa
23:00
-3.7°C 4.9°C -2.7°C - 98% 0.04kPa
Tue, Apr 21 Sunrise 06:25 Sunset 20:14
24:00
-4.7°C 4.4°C -2.9°C - 98% 0.06kPa
01:00
-5.3°C 4.1°C -2.8°C - 72% 0.08kPa
02:00
-6°C 4°C -3.1°C - 38% 0.1kPa
03:00
-7.4°C 3.3°C -1.7°C - 25% 0.19kPa
04:00
-9.7°C 2.6°C -0.28°C - 13% 0.3kPa
05:00
-13°C 1.9°C 1.1°C - 0% 0.44kPa
06:00
-13°C 1.9°C 2°C - 0% 0.48kPa
07:00
-13°C 1.9°C 2.8°C - 0% 0.53kPa
08:00
-13°C 1.9°C 3.7°C - 1% 0.58kPa
09:00
-13°C 2.5°C 3.5°C - 15% 0.56kPa
10:00
-13°C 3.1°C 3.4°C - 30% 0.55kPa
11:00
-12°C 3.7°C 3.3°C - 44% 0.53kPa
12:00
-11°C 3.6°C 2.2°C - 38% 0.44kPa
13:00
-9.3°C 3.6°C 1.2°C - 31% 0.36kPa
14:00
-8.4°C 3.6°C 0.15°C - 25% 0.29kPa
15:00
-6.8°C 3.5°C -1.1°C - 20% 0.2kPa
16:00
-5.7°C 3.5°C -2.3°C - 16% 0.12kPa
17:00
-4.9°C 3.5°C -3.5°C - 11% 0.05kPa
18:00
-5°C 3.5°C -3.6°C - 10% 0.05kPa
19:00
-5°C 3.5°C -3.7°C - 9% 0.04kPa
20:00
-5.1°C 3.5°C -3.8°C - 8% 0.04kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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