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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)
Time Window 88% failing
Wind Speed 63% failing
Frost Probability 31% failing

Currently

Real-time conditions
Soil Temperature-5.1°C
Dew Point-17.7°C (low dew point)
Wind Speed3.1m/s (calm conditions)
Cloud Cover73%

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
Sat, Feb 21
20:0071%5.2m/s
21:0075%4.8m/s
22:0078%4.5m/s
23:0084%4.1m/s
Sun, Feb 22
24:0084%3.5m/s
01:0084%3.6m/s
02:0082%3.9m/s
03:0087%3.9m/s
04:0083%3.9m/s
05:0083%3.8m/s
06:0087%3.5m/s
07:0076%3.2m/s
08:0076%3.1m/s
09:0085%3m/s
10:0074%3.1m/s
11:0076%2.7m/s
12:0068%2.5m/s
13:0067%2.5m/s
14:0067%2.8m/s
15:0065%3m/s
16:0069%3m/s
17:0066%3.1m/s
18:0069%2.9m/s
19:0072%2.9m/s
20:0073%3.1m/s
21:0072%3m/s
22:0079%3.1m/s
23:0073%3.2m/s
Mon, Feb 23
24:0069%3.5m/s
01:0069%3.9m/s
02:0069%4.1m/s
03:0067%4.3m/s
04:0067%4.7m/s
05:0063%4.9m/s
06:0063%4.7m/s
07:0063%5.1m/s
08:0060%4.9m/s
09:0056%4.5m/s
10:0052%4.5m/s
11:0052%4.4m/s
12:0051%3.6m/s
13:0048%4.4m/s
14:0051%4m/s
15:0056%4.6m/s
16:0049%4.7m/s
17:0049%4.5m/s
18:0052%5m/s
19:0056%4.9m/s
20:0059%4.9m/s
21:0059%5m/s
22:0059%4.5m/s
23:0075%4.3m/s
Tue, Feb 24
24:0078%4.2m/s
01:0080%4.2m/s
02:0077%4.2m/s
03:0071%4.2m/s
04:0065%4.2m/s
05:0061%4.1m/s
06:0061%3.9m/s
07:0055%3.8m/s
08:0055%3.6m/s
09:0065%3.6m/s
10:0080%3.4m/s
11:0069%3.2m/s
12:0071%2.8m/s
13:0067%2.5m/s
14:0067%2.1m/s
15:0067%1.8m/s
16:0084%1.4m/s
17:0084%1.4m/s
18:0084%0.9m/s
19:0086%0.17m/s
20:0088%1.1m/s
21:0088%1m/s
22:0088%0.9m/s
23:0088%1.1m/s
Wed, Feb 25
24:0088%1.1m/s
01:0088%1m/s
02:0080%0.84m/s
03:0078%0.67m/s
04:0064%0.5m/s
05:0061%0.41m/s
06:0057%0.33m/s
07:0056%0.25m/s
08:0057%0.45m/s
09:0057%0.66m/s
10:0055%0.86m/s
11:0059%0.98m/s
12:0070%1.1m/s
13:0074%1.2m/s
14:0074%1.3m/s
15:0074%1.4m/s
16:0074%1.4m/s
17:0078%1.3m/s
18:0078%1.1m/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
Sun, Feb 22 Sunrise 07:20 Sunset 18:04
20:00
-18°C -5.1°C -6.4°C - 73% 0.23kPa
21:00
-17°C -5.2°C -6.5°C - 100% 0.22kPa
22:00
-17°C -5.3°C -6.7°C - 37% 0.21kPa
23:00
-18°C -5.4°C -7.1°C - 74% 0.21kPa
Mon, Feb 23 Sunrise 07:20 Sunset 18:04
24:00
-17°C -5.5°C -7.3°C - 100% 0.2kPa
01:00
-16°C -5.6°C -7.2°C - 100% 0.18kPa
02:00
-16°C -5.7°C -7.3°C - 100% 0.18kPa
03:00
-15°C -5.8°C -7.1°C - 100% 0.17kPa
04:00
-13°C -5.8°C -6.1°C - 89% 0.16kPa
05:00
-11°C -5.8°C -5.3°C - 88% 0.15kPa
06:00
-11°C -5.8°C -6.2°C - 100% 0.13kPa
07:00
-12°C -5.8°C -7.3°C - 100% 0.11kPa
08:00
-11°C -5.8°C -7.9°C - 100% 0.08kPa
09:00
-7.3°C -5.8°C -5.9°C - 46% 0.04kPa
10:00
-4.5°C -5.8°C -3.9°C - 49% 0.02kPa
11:00
-3.4°C -5.8°C -3°C - 56% 0.02kPa
12:00
-3.2°C -5.6°C -2.9°C - 62% 0.01kPa
13:00
-3.5°C -5.4°C -3.3°C - 99% 0.01kPa
14:00
-3.8°C -5.3°C -3.3°C - 74% 0.02kPa
15:00
-4.6°C -5.1°C -3.5°C - 42% 0.04kPa
16:00
-4.9°C -4.9°C -4.2°C - 61% 0.03kPa
17:00
-5.8°C -4.8°C -5.4°C - 65% 0.01kPa
18:00
-7.8°C -4.8°C -7°C - 41% 0.02kPa
19:00
-9.2°C -4.8°C -8.1°C - 43% 0.03kPa
20:00
-9.4°C -4.9°C -8°C - 34% 0.03kPa
21:00
-9.7°C -4.9°C -8.2°C - 35% 0.04kPa
22:00
-10°C -4.9°C -8.1°C - 29% 0.05kPa
23:00
-12°C -5°C -8.3°C - 5% 0.08kPa
Tue, Feb 24 Sunrise 07:18 Sunset 18:06
24:00
-13°C -5.1°C -7.8°C - 5% 0.11kPa
01:00
-12°C -5.3°C -7.3°C - 5% 0.11kPa
02:00
-11°C -5.4°C -7°C - 7% 0.1kPa
03:00
-10°C -5.5°C -6.7°C - 24% 0.09kPa
04:00
-9.5°C -5.6°C -6.6°C - 12% 0.08kPa
05:00
-8.8°C -5.7°C -6.4°C - 27% 0.07kPa
06:00
-8.5°C -5.8°C -6.3°C - 30% 0.06kPa
07:00
-8.1°C -5.8°C -6.4°C - 74% 0.05kPa
08:00
-7.5°C -5.9°C -5.7°C - 69% 0.05kPa
09:00
-5.6°C -5.9°C -3.5°C - 17% 0.07kPa
10:00
-4.5°C -5.9°C -1.4°C - 5% 0.11kPa
11:00
-3°C -5.7°C -0.63°C - 5% 0.09kPa
12:00
-2°C -5.5°C -0.44°C - 6% 0.06kPa
13:00
-1.6°C -5.3°C -0.15°C - 14% 0.06kPa
14:00
-1.9°C -5°C -0.07°C - 14% 0.08kPa
15:00
-2.3°C -4.8°C -0.005°C - 12% 0.1kPa
16:00
-3.3°C -4.6°C 0.09°C - 1% 0.14kPa
17:00
-4.9°C -4.4°C -1.4°C - 0% 0.13kPa
18:00
-8°C -4.4°C -3.7°C - 1% 0.13kPa
19:00
-9.2°C -4.4°C -3.7°C - 4% 0.16kPa
20:00
-9.9°C -4.6°C -3.5°C - 0% 0.18kPa
21:00
-10°C -4.7°C -3.8°C - 0% 0.18kPa
22:00
-10°C -4.8°C -3.8°C - 0% 0.18kPa
23:00
-10°C -5°C -3.9°C - 0% 0.18kPa
Wed, Feb 25 Sunrise 07:17 Sunset 18:07
24:00
-11°C -5.1°C -4.1°C - 0% 0.18kPa
01:00
-11°C -5.2°C -4.1°C - 0% 0.18kPa
02:00
-7.2°C -4.5°C -2.5°C - 18% 0.15kPa
03:00
-4°C -3.8°C -0.87°C - 36% 0.12kPa
04:00
-0.8°C -3.2°C 0.75°C - 54% 0.07kPa
05:00
-0.2°C -3.1°C 0.83°C - 63% 0.05kPa
06:00
0.4°C -3.1°C 0.9°C - 72% 0.02kPa
07:00
1°C -3.1°C 0.97°C - 81% 0kPa
08:00
0.8°C -3°C 1°C - 76% 0.01kPa
09:00
0.6°C -3°C 1.1°C - 72% 0.02kPa
10:00
0.4°C -2.9°C 1.1°C - 68% 0.03kPa
11:00
-2.8°C -2.9°C -0.44°C - 70% 0.1kPa
12:00
-6.2°C -2.8°C -2°C - 71% 0.15kPa
13:00
-9.8°C -2.8°C -3.5°C - 73% 0.18kPa
14:00
-10°C -2.8°C -3.7°C - 75% 0.19kPa
15:00
-11°C -2.9°C -4°C - 77% 0.2kPa
16:00
-12°C -2.9°C -4.2°C - 79% 0.2kPa
17:00
-12°C -3°C -4.1°C - 81% 0.21kPa
18:00
-12°C -3.1°C -4.1°C - 83% 0.21kPa
19:00
-12°C -3.2°C -4°C - 85% 0.22kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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