Rule Morning Frost

Morning Frost Forecast for Grindelwald, Alps

Grindelwald, Bern, Switzerland

Grindelwald sits beneath the Eiger’s immense north face, with timber chalets, green meadows and valley lines building depth toward snow-covered peaks.

Currently

Real-time conditions

Frost Probability

Soil Temperature6.1°C

Dew Point6.3°C (moderate dew point)

Wind Speed2.4m/s (calm conditions)

Cloud Cover77%

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 (95-hour forecast)

Frost Probability100% of hours
Time Window88% of hours
Wind Speed28% 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 Grindelwald.

Explore Morning Frost conditions across Alps →

Recorded match history

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

Last 30 days

recorded matching windows

Last 90 days

recorded matching windows · 64% average confidence

Last 365 days

114

recorded matching windows · 65% average confidence

Most frequent recorded start hour

05:00 local time, shared by 29 of 114 matches recorded in the last 365 days.

Most represented month

May, with 36 of 114 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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95-hour requirements breakdown

When available, the detailed table below covers only the stated 95-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 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
Wed, Aug 12
16:00	✕	35%	0.91m/s
17:00	✕	35%	0.68m/s
18:00	✕	35%	0.71m/s
19:00	✕	37%	0.52m/s
20:00	✕	27%	1m/s
21:00	✕	2.6%	0.89m/s
22:00	✕	29%	0.65m/s
23:00	✕	36%	1.2m/s
Thu, Aug 13
24:00	✕	42%	1.3m/s
01:00	✕	44%	0.58m/s
02:00	✕	41%	0.32m/s
03:00	✕	44%	0.6m/s
04:00	✕	52%	0.54m/s
05:00	✓	52%	0.61m/s
06:00	✓	52%	0.46m/s
07:00	✓	52%	0.44m/s
08:00	✕	52%	0.3m/s
09:00	✕	54%	0.47m/s
10:00	✕	51%	0.69m/s
11:00	✕	45%	0.83m/s
12:00	✕	45%	1.1m/s
13:00	✕	43%	1.5m/s
14:00	✕	37%	1.9m/s
15:00	✕	34%	2.2m/s
16:00	✕	3.2%	2.4m/s
17:00	✕	3.5%	2.1m/s
18:00	✕	38%	1.6m/s
19:00	✕	3.3%	0.99m/s
20:00	✕	41%	0.52m/s
21:00	✕	41%	0.72m/s
22:00	✕	48%	0.73m/s
23:00	✕	41%	0.73m/s
Fri, Aug 14
24:00	✕	50%	1.4m/s
01:00	✕	50%	0.99m/s
02:00	✕	48%	0.6m/s
03:00	✕	44%	0.63m/s
04:00	✕	44%	0.47m/s
05:00	✓	41%	0.18m/s
06:00	✓	41%	0.16m/s
07:00	✓	45%	0.34m/s
08:00	✕	50%	0.18m/s
09:00	✕	51%	0.43m/s
10:00	✕	45%	0.83m/s
11:00	✕	41%	0.86m/s
12:00	✕	41%	1m/s
13:00	✕	41%	1.1m/s
14:00	✕	41%	1.4m/s
15:00	✕	37%	1.7m/s
16:00	✕	32%	2.1m/s
17:00	✕	29%	2m/s
18:00	✕	3.3%	1.4m/s
19:00	✕	38%	0.88m/s
20:00	✕	37%	0.6m/s
21:00	✕	34%	0.91m/s
22:00	✕	36%	0.74m/s
23:00	✕	36%	0.8m/s
Sat, Aug 15
24:00	✕	35%	0.99m/s
01:00	✕	37%	0.8m/s
02:00	✕	36%	0.85m/s
03:00	✕	50%	1.1m/s
04:00	✕	46%	0.81m/s
05:00	✓	52%	0.42m/s
06:00	✓	52%	0.48m/s
07:00	✓	50%	0.81m/s
08:00	✕	46%	0.8m/s
09:00	✕	43%	0.4m/s
10:00	✕	36%	0.57m/s
11:00	✕	43%	0.52m/s
12:00	✕	40%	0.4m/s
13:00	✕	36%	0.34m/s
14:00	✕	39%	0.64m/s
15:00	✕	37%	0.53m/s
16:00	✕	20%	2.1m/s
17:00	✕	33%	2.3m/s
18:00	✕	18%	3.1m/s
19:00	✕	18%	3.2m/s
20:00	✕	20%	2.4m/s
21:00	✕	21%	2m/s
22:00	✕	33%	2.4m/s
23:00	✕	33%	2m/s
Sun, Aug 16
24:00	✕	33%	2m/s
01:00	✕	34%	2.1m/s
02:00	✕	33%	1.9m/s
03:00	✕	35%	1.6m/s
04:00	✕	37%	1.3m/s
05:00	✓	37%	0.99m/s
06:00	✓	39%	0.76m/s
07:00	✓	39%	0.53m/s
08:00	✕	39%	0.29m/s
09:00	✕	37%	0.76m/s
10:00	✕	22%	1.2m/s
11:00	✕	13%	1.7m/s
12:00	✕	15%	1.2m/s
13:00	✕	21%	0.75m/s
14:00	✕	21%	0.28m/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 06:23 Sunset 20:41
16:00	6.3°C	6.1°C	15°C	-	77%	0.76kPa
17:00	7°C	6.1°C	14°C	-	77%	0.55kPa
18:00	7°C	6°C	13°C	-	65%	0.51kPa
19:00	7.2°C	6.1°C	13°C	-	67%	0.49kPa
20:00	6.7°C	6°C	11°C	-	49%	0.36kPa
21:00 ☾	5.4°C	5.9°C	9.3°C	-	56%	0.27kPa
22:00 ☾	4.8°C	5.6°C	9.2°C	-	18%	0.31kPa
23:00 ☾	4.2°C	5.5°C	8.9°C	-	59%	0.32kPa
Fri, Aug 14 Sunrise 06:23 Sunset 20:41
24:00 ☾	3.9°C	5.2°C	8.7°C	-	10%	0.32kPa
01:00 ☾	3.8°C	5.1°C	8.5°C	-	6%	0.31kPa
02:00 ☾	3.6°C	4.7°C	8.4°C	-	20%	0.31kPa
03:00 ☾	3.5°C	4.6°C	8.2°C	-	34%	0.3kPa
04:00 ☾	3.2°C	4.5°C	8°C	-	38%	0.3kPa
05:00 ☾	2.8°C	4.4°C	7.5°C	-	49%	0.29kPa
06:00 ☾	2°C	4.3°C	7.4°C	-	43%	0.32kPa
07:00	2°C	4.2°C	8.1°C	-	50%	0.38kPa
08:00	4.2°C	4.2°C	11°C	-	12%	0.51kPa
09:00	3.1°C	4.2°C	13°C	-	3%	0.71kPa
10:00	2.2°C	4.2°C	13°C	-	1%	0.83kPa
11:00	2.3°C	4.3°C	14°C	-	14%	0.88kPa
12:00	2.7°C	4.6°C	15°C	-	20%	0.93kPa
13:00	2.8°C	5°C	15°C	-	20%	0.94kPa
14:00	3.4°C	5.2°C	15°C	-	21%	0.96kPa
15:00	3.7°C	5.6°C	15°C	-	38%	0.96kPa
16:00	4°C	5.8°C	15°C	-	57%	0.93kPa
17:00	4.1°C	6°C	15°C	-	71%	0.85kPa
18:00	5°C	6.1°C	14°C	-	88%	0.68kPa
19:00	5.8°C	6°C	12°C	-	68%	0.51kPa
20:00	6.1°C	6°C	11°C	-	85%	0.39kPa
21:00 ☾	5.2°C	5.9°C	11°C	-	75%	0.41kPa
22:00 ☾	5°C	5.8°C	11°C	-	71%	0.42kPa
23:00 ☾	5°C	5.8°C	10°C	-	66%	0.4kPa
Sat, Aug 15 Sunrise 06:24 Sunset 20:39
24:00 ☾	4.8°C	5.7°C	10°C	-	81%	0.36kPa
01:00 ☾	5.1°C	5.6°C	9.9°C	-	84%	0.34kPa
02:00 ☾	5°C	5.5°C	10°C	-	67%	0.37kPa
03:00 ☾	4.9°C	5.5°C	9.9°C	-	4%	0.35kPa
04:00 ☾	3.4°C	5.2°C	8.1°C	-	12%	0.3kPa
05:00 ☾	3.2°C	5.1°C	7.8°C	-	4%	0.29kPa
06:00 ☾	2.8°C	4.8°C	7.7°C	-	3%	0.3kPa
07:00	3.5°C	4.6°C	8.3°C	-	4%	0.31kPa
08:00	6.4°C	4.6°C	11°C	-	22%	0.39kPa
09:00	5.4°C	4.7°C	12°C	-	48%	0.54kPa
10:00	5.2°C	4.8°C	13°C	-	92%	0.61kPa
11:00	5.2°C	5.1°C	13°C	-	29%	0.66kPa
12:00	5.4°C	5.3°C	14°C	-	51%	0.69kPa
13:00	5.6°C	5.5°C	14°C	-	85%	0.68kPa
14:00	6.8°C	5.5°C	13°C	-	100%	0.54kPa
15:00	7°C	5.5°C	11°C	-	100%	0.27kPa
16:00	7.2°C	5.4°C	9.3°C	-	94%	0.16kPa
17:00	7.2°C	5.5°C	10°C	-	98%	0.24kPa
18:00	7.6°C	5.4°C	10°C	-	100%	0.19kPa
19:00	7.4°C	5.4°C	9.1°C	-	92%	0.13kPa
20:00	7.1°C	5.3°C	8.8°C	-	96%	0.12kPa
21:00 ☾	4.8°C	5.2°C	7.8°C	-	78%	0.2kPa
22:00 ☾	4.3°C	5°C	8.2°C	-	84%	0.25kPa
23:00 ☾	3.9°C	4.9°C	7.9°C	-	100%	0.26kPa
Sun, Aug 16 Sunrise 06:26 Sunset 20:37
24:00 ☾	3.7°C	4.7°C	7.9°C	-	100%	0.27kPa
01:00 ☾	3.4°C	4.5°C	7.8°C	-	72%	0.28kPa
02:00 ☾	2.7°C	4.4°C	7.4°C	-	100%	0.29kPa
03:00 ☾	3.8°C	4.3°C	9.1°C	-	99%	0.36kPa
04:00 ☾	4.8°C	4.2°C	11°C	-	97%	0.44kPa
05:00 ☾	5.8°C	4.2°C	13°C	-	96%	0.53kPa
06:00 ☾	6.2°C	4.4°C	13°C	-	93%	0.53kPa
07:00	6.6°C	4.7°C	13°C	-	91%	0.53kPa
08:00	7°C	5°C	13°C	-	88%	0.53kPa
09:00	8°C	5°C	12°C	-	92%	0.35kPa
10:00	8.7°C	5°C	11°C	-	96%	0.19kPa
11:00	9.2°C	5.1°C	9.8°C	-	100%	0.05kPa
12:00	8.5°C	5.1°C	9.3°C	-	100%	0.06kPa
13:00	7.8°C	5.1°C	8.8°C	-	100%	0.07kPa
14:00	7.1°C	5.1°C	8.3°C	-	100%	0.09kPa
15:00	6.5°C	4.9°C	7.9°C	-	96%	0.1kPa

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.

How opportunities work → Weather data sources →

Forecast generated

Aug 13, 2026, 1:54 PM UTC

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