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Rule Morning Frost

Morning Frost Forecast for Matterhorn, Alps

Zermatt, Valais, Switzerland

The Matterhorn’s pyramid summit rises above Zermatt’s larch slopes and alpine lakes, creating clean silhouettes, reflections and warm first-light studies.

Currently

Real-time conditions
Soil Temperature11.7°C
Dew Point5.6°C (moderate dew point)
Wind Speed1.5m/s (calm conditions)
Cloud Cover91%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich

No opportunities in the next 14 days

See which requirements block the most forecast hours below.

Most common blockers (86-hour forecast)

  • Frost Probability100% of hours
  • Time Window86% of hours
  • Wind Speed35% of hours

How this forecast is evaluated

See which weather signals PhotoWeather uses to identify Morning Frost conditions across Alps. The requirements and hourly values below show how those signals apply at Matterhorn.

Explore Morning Frost conditions across Alps →

Recorded match history

Completed PhotoWeather forecast matches recorded for this exact rule at Matterhorn during the last 365 days.

Last 30 days
0
recorded matching windows
Last 90 days
8
recorded matching windows · 65% average confidence
Last 365 days
56
recorded matching windows · 64% average confidence
Most frequent recorded start hour

06:00 local time, shared by 21 of 56 matches recorded in the last 365 days.

Most represented month

April, with 18 of 56 matches recorded in the last 365 days.

These figures use completed PhotoWeather MatchEvent records from the previous 365 days only. They describe recorded forecast matches, not observations, climatological probability, or a guarantee of future conditions.

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86-hour requirements breakdown

When available, the detailed table below covers only the stated 86-hour horizon (typically 72–168 hours, depending on available hourly data). Opportunity records above span the next 14 days, so this table does not explain that entire 14-day period.

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
Thu, Aug 13
06:000%1.8m/s
07:000%1.7m/s
08:000%1.8m/s
09:000%1.5m/s
10:000%1m/s
11:000%1.1m/s
12:000%1.4m/s
13:000%1.6m/s
14:000%1.6m/s
15:000%0.76m/s
16:000%1.4m/s
17:000%1.8m/s
18:000%1.4m/s
19:000%1.2m/s
20:000%1.4m/s
21:000%0.99m/s
22:000%1.5m/s
23:000%0.65m/s
Fri, Aug 14
24:000%0.7m/s
01:000%0.79m/s
02:000%1.3m/s
03:000%0.93m/s
04:000%0.95m/s
05:000%1.6m/s
06:000%1.9m/s
07:000%2.1m/s
08:000%1.9m/s
09:000%1.8m/s
10:000%1.9m/s
11:000%1.7m/s
12:000%1.4m/s
13:000%1.2m/s
14:000%0.8m/s
15:000%1.3m/s
16:000%0.88m/s
17:000%2.1m/s
18:000%1.7m/s
19:000%1.5m/s
20:000%0.9m/s
21:000%1.2m/s
22:000%0.67m/s
23:000%1m/s
Sat, Aug 15
24:000%0.73m/s
01:000%0.55m/s
02:000%0.94m/s
03:000%1.3m/s
04:000%1.8m/s
05:000%1.6m/s
06:000%0.83m/s
07:005%0.61m/s
08:005%0.63m/s
09:000%0.33m/s
10:000%0.46m/s
11:000%0.39m/s
12:000%0.07m/s
13:000%0.26m/s
14:000%0.65m/s
15:000%0.85m/s
16:000%1.7m/s
17:000%2.5m/s
18:000%1.9m/s
19:000%1.4m/s
20:000%1m/s
21:000%1.8m/s
22:000%1.7m/s
23:000%0.46m/s
Sun, Aug 16
24:000%1.4m/s
01:000%2.2m/s
02:000%2.5m/s
03:000%1.8m/s
04:000%1.2m/s
05:000%0.52m/s
06:000%0.92m/s
07:000%1.3m/s
08:000%1.7m/s
09:000%1.7m/s
10:000%1.6m/s
11:000%1.5m/s
12:000%1.5m/s
13:000%1.4m/s
14:000%1.3m/s
15:000%1.1m/s
16:000%0.95m/s
17:000%0.8m/s
18:000%0.76m/s
19:000%0.72m/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, Aug 13 Sunrise 06:26 Sunset 20:41
22:00
5.6°C 12°C 9.2°C - 91% 0.25kPa
23:00
5.5°C 11°C 9°C - 68% 0.24kPa
Fri, Aug 14 Sunrise 06:26 Sunset 20:41
24:00
4.8°C 11°C 7.9°C - 37% 0.21kPa
01:00
4.6°C 11°C 7.8°C - 78% 0.21kPa
02:00
4.6°C 10°C 7.7°C - 95% 0.2kPa
03:00
4.8°C 9.9°C 8°C - 32% 0.21kPa
04:00
3.9°C 9.5°C 7°C - 21% 0.19kPa
05:00
3.9°C 9°C 6.8°C - 28% 0.18kPa
06:00
4.2°C 8.7°C 6.8°C - 32% 0.17kPa
07:00
4.5°C 8.4°C 7.4°C - 36% 0.19kPa
08:00
5.9°C 8.3°C 9.7°C - 26% 0.27kPa
09:00
4.7°C 8.6°C 11°C - 42% 0.47kPa
10:00
3.2°C 9°C 12°C - 39% 0.64kPa
11:00
2.9°C 9.6°C 13°C - 36% 0.73kPa
12:00
3°C 10°C 14°C - 34% 0.81kPa
13:00
3.4°C 11°C 14°C - 66% 0.84kPa
14:00
3.9°C 12°C 14°C - 90% 0.77kPa
15:00
4.1°C 12°C 13°C - 95% 0.66kPa
16:00
4.8°C 12°C 12°C - 100% 0.53kPa
17:00
4.9°C 12°C 11°C - 62% 0.45kPa
18:00
5.1°C 12°C 12°C - 78% 0.48kPa
19:00
5°C 12°C 12°C - 95% 0.49kPa
20:00
5.8°C 12°C 10°C - 99% 0.32kPa
21:00
5.8°C 12°C 9.1°C - 97% 0.23kPa
22:00
6°C 12°C 9.1°C - 64% 0.22kPa
23:00
4.8°C 11°C 8.2°C - 47% 0.22kPa
Sat, Aug 15 Sunrise 06:27 Sunset 20:39
24:00
3.6°C 11°C 7.2°C - 23% 0.22kPa
01:00
3°C 10°C 6.7°C - 96% 0.22kPa
02:00
2.6°C 10°C 6.6°C - 100% 0.24kPa
03:00
2.4°C 9.6°C 6.4°C - 7% 0.23kPa
04:00
2.2°C 9.1°C 6.1°C - 4% 0.23kPa
05:00
2°C 8.8°C 5.8°C - 21% 0.22kPa
06:00
1.8°C 8.4°C 5.4°C - 10% 0.2kPa
07:00
2.1°C 8°C 5.9°C - 5% 0.22kPa
08:00
4°C 7.9°C 9.2°C - 5% 0.35kPa
09:00
3.6°C 8.2°C 11°C - 6% 0.48kPa
10:00
3.9°C 8.7°C 12°C - 10% 0.55kPa
11:00
4.3°C 9.3°C 12°C - 11% 0.6kPa
12:00
5.1°C 10°C 13°C - 81% 0.58kPa
13:00
5.4°C 11°C 12°C - 95% 0.53kPa
14:00
5.2°C 11°C 12°C - 100% 0.48kPa
15:00
6.1°C 11°C 10°C - 100% 0.28kPa
16:00
6.9°C 11°C 8.8°C - 100% 0.14kPa
17:00
6.2°C 10°C 7.9°C - 100% 0.12kPa
18:00
5.9°C 10°C 7.3°C - 100% 0.09kPa
19:00
5.8°C 10°C 7.7°C - 100% 0.13kPa
20:00
5.8°C 10°C 7.3°C - 100% 0.1kPa
21:00
5.5°C 9.8°C 7.3°C - 100% 0.12kPa
22:00
4.8°C 9.6°C 7.4°C - 100% 0.17kPa
23:00
4.1°C 9.4°C 7.5°C - 100% 0.22kPa
Sun, Aug 16 Sunrise 06:29 Sunset 20:37
24:00
3.7°C 9.2°C 7.7°C - 98% 0.25kPa
01:00
3.3°C 9°C 7.1°C - 100% 0.24kPa
02:00
3.7°C 8.7°C 6.8°C - 64% 0.19kPa
03:00
4.4°C 8.5°C 8.4°C - 64% 0.27kPa
04:00
5°C 8.3°C 10°C - 63% 0.35kPa
05:00
5.6°C 8.2°C 12°C - 63% 0.46kPa
06:00
6°C 8.7°C 11°C - 75% 0.41kPa
07:00
6.4°C 9.2°C 11°C - 88% 0.37kPa
08:00
6.7°C 9.7°C 11°C - 100% 0.33kPa
09:00
6.9°C 9.9°C 11°C - 100% 0.29kPa
10:00
7.1°C 10°C 10°C - 100% 0.25kPa
11:00
7.2°C 10°C 10°C - 100% 0.22kPa
12:00
7.2°C 10°C 9.9°C - 95% 0.2kPa
13:00
7.1°C 10°C 9.6°C - 91% 0.19kPa
14:00
7°C 10°C 9.3°C - 86% 0.17kPa
15:00
7.2°C 10°C 8.8°C - 90% 0.12kPa
16:00
7.4°C 9.9°C 8.4°C - 94% 0.07kPa
17:00
7.5°C 9.8°C 7.9°C - 98% 0.03kPa
18:00
7.1°C 9.6°C 7.8°C - 90% 0.05kPa
19:00
6.8°C 9.5°C 7.7°C - 81% 0.06kPa
20:00
6.4°C 9.4°C 7.6°C - 72% 0.08kPa
21:00
5.7°C 9°C 7.1°C - 81% 0.09kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

How this forecast is made

Opportunities are threshold-based signals: PhotoWeather checks whether forecast conditions match the rules for a photography scenario. They are planning guidance, not guarantees. Forecasts can change as new model runs arrive, and confidence generally decreases farther into the forecast horizon, so recheck conditions before travelling.

The weather forecast foundation comes through Open-Meteo , which aggregates models from weather agencies. PhotoWeather applies condition-specific thresholds and derived calculations; not every condition uses every model or data input.

Forecast generated

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