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Rule Morning Frost

Morning Frost Forecast for Chamonix, Alps

Chamonix, Auvergne-Rhône-Alpes, France

Chamonix lies below the Mont Blanc massif, with glaciers, sharp aiguilles and valley architecture supplying dramatic contrasts of rock, ice and settlement.

Currently

Real-time conditions
Soil Temperature19.5°C
Dew Point10.4°C (moderate dew point)
Wind Speed2.6m/s (calm conditions)
Cloud Cover67%

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 (81-hour forecast)

  • Frost Probability100% of hours
  • Time Window83% of hours
  • Wind Speed74% 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 Chamonix.

Explore Morning Frost conditions across Alps →

Recorded match history

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

Last 30 days
0
recorded matching windows
Last 90 days
0
recorded matching windows
Last 365 days
6
recorded matching windows · 58% average confidence

Only 6 completed matches are recorded in the last 365 days—insufficient history to identify a reliable typical start time or month.

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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81-hour requirements breakdown

When available, the detailed table below covers only the stated 81-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 81 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%2m/s
08:000%1.7m/s
09:000%0.71m/s
10:000%0.79m/s
11:000%1.5m/s
12:000%1.9m/s
13:000%2.2m/s
14:000%2.3m/s
15:000%2.5m/s
16:000%2.6m/s
17:000%3.1m/s
18:000%1.4m/s
19:000%1.1m/s
20:000%3m/s
21:000%2.8m/s
22:000%2.6m/s
23:000%2.8m/s
Fri, Aug 14
24:000%2.9m/s
01:000%2.9m/s
02:000%2.7m/s
03:000%2.5m/s
04:000%2.4m/s
05:000%2.4m/s
06:000%2.3m/s
07:000%2.2m/s
08:000%2m/s
09:000%0.95m/s
10:000%0.59m/s
11:000%1.4m/s
12:000%1.9m/s
13:000%2.1m/s
14:000%2.4m/s
15:000%3m/s
16:000%2.3m/s
17:000%2.4m/s
18:000%0.97m/s
19:000%4.2m/s
20:000%3.7m/s
21:000%3.5m/s
22:000%3.5m/s
23:000%3.1m/s
Sat, Aug 15
24:000%2.5m/s
01:000%2.2m/s
02:000%2.6m/s
03:000%2.7m/s
04:000%2.6m/s
05:000%2.6m/s
06:000%2.5m/s
07:000%2.7m/s
08:000%2.4m/s
09:000%1.2m/s
10:000%0.48m/s
11:000%0.93m/s
12:000%1.2m/s
13:000%1.2m/s
14:000%1m/s
15:000%2.6m/s
16:000%3.7m/s
17:000%4.3m/s
18:000%4.8m/s
19:000%4.8m/s
20:000%3.5m/s
21:000%2.9m/s
22:000%2.9m/s
23:000%3.3m/s
Sun, Aug 16
24:000%2.7m/s
01:000%2.5m/s
02:000%2.1m/s
03:000%1.9m/s
04:000%1.7m/s
05:000%1.5m/s
06:000%1.1m/s
07:000%0.69m/s
08:000%0.3m/s
09:000%0.48m/s
10:000%0.66m/s
11:000%0.84m/s
12:000%1.5m/s
13:000%2.2m/s
14:000%2.9m/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
Thu, Aug 13 Sunrise 06:29 Sunset 20:44
16:00
10°C 19°C 25°C - 67% 1.9kPa
17:00
11°C 20°C 24°C - 68% 1.7kPa
18:00
12°C 20°C 24°C - 64% 1.5kPa
19:00
13°C 20°C 22°C - 66% 1.2kPa
20:00
12°C 20°C 18°C - 66% 0.72kPa
21:00
11°C 20°C 17°C - 59% 0.69kPa
22:00
10°C 19°C 18°C - 0% 0.8kPa
23:00
9°C 19°C 17°C - 0% 0.73kPa
Fri, Aug 14 Sunrise 06:29 Sunset 20:44
24:00
8.6°C 19°C 16°C - 0% 0.73kPa
01:00
8.3°C 18°C 16°C - 0% 0.74kPa
02:00
7.9°C 18°C 16°C - 0% 0.74kPa
03:00
7.6°C 18°C 16°C - 0% 0.73kPa
04:00
7.3°C 17°C 15°C - 0% 0.73kPa
05:00
6.9°C 17°C 15°C - 0% 0.72kPa
06:00
6.7°C 17°C 15°C - 0% 0.71kPa
07:00
7.2°C 16°C 15°C - 0% 0.7kPa
08:00
10°C 16°C 18°C - 0% 0.81kPa
09:00
9.1°C 17°C 20°C - 0% 1.2kPa
10:00
8.9°C 17°C 22°C - 0% 1.5kPa
11:00
9.1°C 17°C 23°C - 0% 1.6kPa
12:00
8.7°C 18°C 24°C - 1% 1.8kPa
13:00
7.9°C 19°C 24°C - 4% 1.9kPa
14:00
7.8°C 19°C 25°C - 38% 2.1kPa
15:00
7.9°C 20°C 25°C - 91% 2.1kPa
16:00
8.6°C 20°C 24°C - 63% 1.9kPa
17:00
10°C 20°C 24°C - 93% 1.7kPa
18:00
11°C 20°C 21°C - 100% 1.2kPa
19:00
12°C 20°C 16°C - 100% 0.47kPa
20:00
11°C 20°C 15°C - 100% 0.43kPa
21:00
9.9°C 19°C 16°C - 83% 0.57kPa
22:00
9.2°C 19°C 16°C - 87% 0.66kPa
23:00
9.1°C 19°C 16°C - 98% 0.71kPa
Sat, Aug 15 Sunrise 06:31 Sunset 20:42
24:00
9°C 19°C 17°C - 94% 0.78kPa
01:00
8.5°C 18°C 17°C - 84% 0.83kPa
02:00
7.8°C 18°C 17°C - 55% 0.87kPa
03:00
7.1°C 18°C 16°C - 5% 0.83kPa
04:00
6.3°C 18°C 15°C - 10% 0.76kPa
05:00
6.4°C 17°C 15°C - 6% 0.71kPa
06:00
6.3°C 17°C 14°C - 7% 0.69kPa
07:00
6.9°C 17°C 15°C - 6% 0.68kPa
08:00
9.6°C 17°C 17°C - 6% 0.71kPa
09:00
9.3°C 17°C 19°C - 94% 1.1kPa
10:00
9.4°C 17°C 21°C - 48% 1.3kPa
11:00
9.3°C 17°C 22°C - 14% 1.4kPa
12:00
8.8°C 18°C 23°C - 41% 1.6kPa
13:00
8.7°C 19°C 23°C - 100% 1.7kPa
14:00
11°C 19°C 22°C - 100% 1.4kPa
15:00
12°C 19°C 18°C - 100% 0.63kPa
16:00
13°C 19°C 14°C - 99% 0.12kPa
17:00
13°C 18°C 15°C - 97% 0.25kPa
18:00
12°C 18°C 16°C - 100% 0.36kPa
19:00
12°C 18°C 15°C - 98% 0.3kPa
20:00
11°C 18°C 14°C - 100% 0.32kPa
21:00
10°C 18°C 14°C - 88% 0.4kPa
22:00
9.4°C 17°C 14°C - 100% 0.43kPa
23:00
9.4°C 17°C 14°C - 100% 0.44kPa
Sun, Aug 16 Sunrise 06:32 Sunset 20:40
24:00
8.8°C 17°C 14°C - 100% 0.45kPa
01:00
9°C 16°C 14°C - 100% 0.46kPa
02:00
9.1°C 16°C 14°C - 100% 0.47kPa
03:00
9.3°C 15°C 15°C - 100% 0.5kPa
04:00
9.4°C 13°C 15°C - 99% 0.53kPa
05:00
9.6°C 11°C 15°C - 98% 0.56kPa
06:00
9.7°C 12°C 15°C - 99% 0.53kPa
07:00
9.8°C 12°C 15°C - 100% 0.51kPa
08:00
9.9°C 12°C 15°C - 100% 0.48kPa
09:00
10°C 12°C 16°C - 89% 0.53kPa
10:00
10°C 12°C 16°C - 78% 0.58kPa
11:00
10°C 13°C 17°C - 67% 0.63kPa
12:00
11°C 13°C 15°C - 78% 0.41kPa
13:00
11°C 13°C 13°C - 89% 0.22kPa
14:00
11°C 13°C 12°C - 100% 0.07kPa
15:00
10°C 12°C 11°C - 100% 0.08kPa
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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