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Rule Morning Frost

Grindelwald - Morning Frost - Alps

Grindelwald, Bern, 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 86% failing
Wind Speed 61% failing

Currently

Real-time conditions
Soil Temperature4.7°C
Dew Point4.2°C (low dew point)
Wind Speed3.9m/s (calm conditions)
Cloud Cover90%

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 79 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, Jul 8
07:0037%2.7m/s
08:0035%2.8m/s
09:0030%3.3m/s
10:0030%3.5m/s
11:0030%3.6m/s
12:0030%3.5m/s
13:0028%3.6m/s
14:0030%3.9m/s
15:0030%3.9m/s
16:0034%3.9m/s
17:0037%3.8m/s
18:0041%3.7m/s
19:0040%3.5m/s
20:0032%2.9m/s
21:0033%2.6m/s
22:0033%2.3m/s
23:0033%2.1m/s
Thu, Jul 9
24:0034%2m/s
01:0024%1.7m/s
02:0029%1.6m/s
03:0029%1.8m/s
04:0029%1.8m/s
05:0026%1.9m/s
06:0037%1.8m/s
07:0050%1.7m/s
08:0050%1.7m/s
09:0050%1.5m/s
10:0047%1.6m/s
11:0045%1.7m/s
12:0043%2.1m/s
13:0043%2.5m/s
14:0043%2.7m/s
15:0041%3.1m/s
16:0041%3m/s
17:0041%2.9m/s
18:0046%2.7m/s
19:0042%2.2m/s
20:0046%0.95m/s
21:0033%1.2m/s
22:0033%1.4m/s
23:0041%1.4m/s
Fri, Jul 10
24:0050%1.7m/s
01:0050%0.97m/s
02:0050%1.1m/s
03:0037%1.2m/s
04:0039%0.72m/s
05:0041%0.59m/s
06:0041%0.6m/s
07:0054%0.51m/s
08:0054%0.77m/s
09:0052%0.55m/s
10:0050%0.35m/s
11:0046%0.5m/s
12:0037%0.54m/s
13:0036%0.64m/s
14:0037%1m/s
15:0037%1.4m/s
16:0031%2.3m/s
17:0033%2.1m/s
18:0017%2.1m/s
19:0020%2m/s
20:0033%1.9m/s
21:0036%1.6m/s
22:0039%1.4m/s
23:0044%1.1m/s
Sat, Jul 11
24:0041%0.94m/s
01:0043%0.75m/s
02:0038%0.57m/s
03:0045%0.74m/s
04:0046%0.92m/s
05:0045%1.1m/s
06:0038%1.5m/s
07:0033%1.8m/s
08:0032%2.2m/s
09:0031%2.6m/s
10:0031%3m/s
11:0018%3.4m/s
12:0020%2.7m/s
13:0033%1.9m/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
Wed, Jul 8 Sunrise 05:43 Sunset 21:22
15:00
4.2°C 4.7°C 13°C - 90% 0.72kPa
16:00
4.5°C 5°C 13°C - 51% 0.69kPa
17:00
4.3°C 5.2°C 13°C - 27% 0.66kPa
18:00
3.8°C 5.3°C 12°C - 23% 0.62kPa
19:00
3.3°C 5.4°C 11°C - 38% 0.56kPa
20:00
4.5°C 5.3°C 10°C - 65% 0.38kPa
21:00
3.7°C 5.2°C 7.6°C - 97% 0.25kPa
22:00
3.2°C 5°C 6.9°C - 100% 0.23kPa
23:00
3°C 4.8°C 7°C - 100% 0.24kPa
Thu, Jul 9 Sunrise 05:43 Sunset 21:22
24:00
3.3°C 4.6°C 6.7°C - 64% 0.21kPa
01:00
3.4°C 4.4°C 6.4°C - 51% 0.18kPa
02:00
3.3°C 4.2°C 6.1°C - 29% 0.17kPa
03:00
3.4°C 4°C 6°C - 40% 0.16kPa
04:00
3.3°C 3.8°C 5.9°C - 27% 0.15kPa
05:00
3.2°C 3.7°C 5.6°C - 41% 0.14kPa
06:00
3°C 3.5°C 5.6°C - 8% 0.15kPa
07:00
4.1°C 3.4°C 7.4°C - 7% 0.21kPa
08:00
4.6°C 3.4°C 9.4°C - 5% 0.33kPa
09:00
4°C 3.5°C 11°C - 22% 0.48kPa
10:00
3.4°C 3.7°C 12°C - 22% 0.61kPa
11:00
3.2°C 4°C 13°C - 22% 0.69kPa
12:00
4.2°C 4.3°C 14°C - 22% 0.73kPa
13:00
5.2°C 4.7°C 14°C - 22% 0.75kPa
14:00
5.9°C 5°C 15°C - 20% 0.74kPa
15:00
6.3°C 5.3°C 15°C - 20% 0.73kPa
16:00
6.5°C 5.6°C 15°C - 24% 0.69kPa
17:00
6.7°C 5.8°C 14°C - 25% 0.64kPa
18:00
6.8°C 5.9°C 13°C - 22% 0.56kPa
19:00
6.8°C 6°C 12°C - 21% 0.46kPa
20:00
7.2°C 6°C 11°C - 20% 0.31kPa
21:00
6.2°C 5.9°C 8.6°C - 20% 0.17kPa
22:00
5.4°C 5.6°C 7.8°C - 20% 0.16kPa
23:00
4.4°C 5.4°C 7.5°C - 20% 0.2kPa
Fri, Jul 10 Sunrise 05:44 Sunset 21:21
24:00
3.9°C 5.2°C 7.9°C - 0% 0.25kPa
01:00
3.8°C 4.9°C 7.6°C - 0% 0.24kPa
02:00
3.9°C 4.7°C 7.4°C - 3% 0.22kPa
03:00
4.1°C 4.4°C 7.1°C - 0% 0.18kPa
04:00
4.2°C 4.2°C 6.9°C - 0% 0.17kPa
05:00
4°C 3.9°C 6.8°C - 0% 0.18kPa
06:00
3.8°C 3.9°C 6.8°C - 0% 0.19kPa
07:00
5.9°C 3.7°C 9.3°C - 0% 0.24kPa
08:00
7°C 3.8°C 12°C - 0% 0.36kPa
09:00
6.7°C 3.8°C 12°C - 10% 0.46kPa
10:00
6.6°C 4.1°C 13°C - 20% 0.55kPa
11:00
6.6°C 4.4°C 14°C - 26% 0.59kPa
12:00
7.2°C 4.7°C 14°C - 71% 0.63kPa
13:00
7.1°C 5.1°C 14°C - 98% 0.61kPa
14:00
7.6°C 5.3°C 14°C - 100% 0.6kPa
15:00
8.1°C 5.6°C 14°C - 100% 0.56kPa
16:00
8.6°C 5.7°C 14°C - 100% 0.44kPa
17:00
8.2°C 5.7°C 11°C - 100% 0.26kPa
18:00
7.1°C 5.6°C 8.3°C - 100% 0.09kPa
19:00
6°C 5.5°C 8.4°C - 100% 0.16kPa
20:00
6°C 5.4°C 9.2°C - 100% 0.22kPa
21:00
5°C 4.8°C 8.6°C - 77% 0.24kPa
22:00
4°C 4.2°C 7.9°C - 53% 0.25kPa
23:00
3°C 3.7°C 7.3°C - 30% 0.27kPa
Sat, Jul 11 Sunrise 05:45 Sunset 21:20
24:00
4°C 3.6°C 8.7°C - 41% 0.31kPa
01:00
5°C 3.5°C 10°C - 52% 0.36kPa
02:00
5.9°C 3.5°C 11°C - 63% 0.42kPa
03:00
5.9°C 3.7°C 12°C - 50% 0.5kPa
04:00
5.8°C 3.9°C 13°C - 37% 0.58kPa
05:00
5.6°C 4.1°C 14°C - 25% 0.67kPa
06:00
5.9°C 4.3°C 14°C - 50% 0.66kPa
07:00
6.2°C 4.6°C 14°C - 75% 0.65kPa
08:00
6.5°C 4.9°C 14°C - 100% 0.64kPa
09:00
6.2°C 4.9°C 12°C - 100% 0.42kPa
10:00
5.6°C 4.9°C 9.3°C - 100% 0.26kPa
11:00
4.8°C 4.9°C 6.8°C - 100% 0.13kPa
12:00
5.4°C 4.9°C 8.2°C - 98% 0.19kPa
13:00
5.9°C 4.9°C 9.5°C - 95% 0.26kPa
14:00
6.4°C 4.9°C 11°C - 93% 0.34kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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