Rule Morning Frost

Morning Frost Forecast for Alkmaar, The Netherlands

Alkmaar, North Holland, The Netherlands

The Waag, stepped-gable houses and canals frame the historic cheese-market square, with bridges creating clear foreground lines.

Currently

Real-time conditions

Frost Probability

Soil Temperature17.0°C

Dew Point8.7°C (moderate dew point)

Wind Speed5.5m/s (moderate winds)

Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Amsterdam

No opportunities in the next 14 days

See which requirements block the most forecast hours below.

Most common blockers (85-hour forecast)

Frost Probability100% of hours
Wind Speed97% of hours
Time Window83% of hours

How this forecast is evaluated

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

Explore Morning Frost conditions across The Netherlands →

Recorded match history

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

Last 30 days

recorded matching windows

Last 90 days

recorded matching windows

Last 365 days

recorded matching windows · 68% average confidence

Only 2 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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85-hour requirements breakdown

When available, the detailed table below covers only the stated 85-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 85 hours

AND logic: all conditions required

Meets requirement

Misses requirement

Time Europe/Amsterdam	Time Window Sunrise -45m to +90m	Frost Probability ≥ 60.0%	Wind Speed ≤ 1.5m/s
Sat, Aug 22
07:00	✓	0%	5.6m/s
08:00	✓	0%	5.5m/s
09:00	✕	0%	5.2m/s
10:00	✕	0%	5.8m/s
11:00	✕	0%	6.2m/s
12:00	✕	0%	7.1m/s
13:00	✕	0%	7.2m/s
14:00	✕	0%	7.5m/s
15:00	✕	0%	7.9m/s
16:00	✕	0%	7.7m/s
17:00	✕	0%	7.2m/s
18:00	✕	0%	7.2m/s
19:00	✕	0%	6.1m/s
20:00	✕	0%	5.8m/s
21:00	✕	0%	5.4m/s
22:00	✕	0%	5.5m/s
23:00	✕	0%	5.4m/s
Sun, Aug 23
24:00	✕	0%	5.3m/s
01:00	✕	0%	5m/s
02:00	✕	0%	4.6m/s
03:00	✕	0%	5.4m/s
04:00	✕	0%	5.1m/s
05:00	✓	0%	5.3m/s
06:00	✓	0%	5.3m/s
07:00	✓	0%	4.9m/s
08:00	✓	0%	5.1m/s
09:00	✕	0%	5m/s
10:00	✕	0%	5.7m/s
11:00	✕	0%	5.3m/s
12:00	✕	0%	5.1m/s
13:00	✕	0%	5.3m/s
14:00	✕	0%	6.5m/s
15:00	✕	0%	6.8m/s
16:00	✕	0%	6.5m/s
17:00	✕	0%	5.8m/s
18:00	✕	0%	5.3m/s
19:00	✕	0%	4.9m/s
20:00	✕	0%	4.1m/s
21:00	✕	0%	3.4m/s
22:00	✕	0%	3.3m/s
23:00	✕	0%	3.2m/s
Mon, Aug 24
24:00	✕	0%	3m/s
01:00	✕	0%	2.6m/s
02:00	✕	0%	2.3m/s
03:00	✕	0%	2m/s
04:00	✕	0%	1.8m/s
05:00	✓	0%	1.9m/s
06:00	✓	0%	1.5m/s
07:00	✓	0%	1.2m/s
08:00	✓	0%	1.2m/s
09:00	✕	0%	2.4m/s
10:00	✕	0%	3.9m/s
11:00	✕	0%	4.2m/s
12:00	✕	0%	4m/s
13:00	✕	0%	3.6m/s
14:00	✕	0%	3.5m/s
15:00	✕	0%	4.8m/s
16:00	✕	0%	5.6m/s
17:00	✕	0%	6.1m/s
18:00	✕	0%	6.3m/s
19:00	✕	0%	6.7m/s
20:00	✕	0%	7m/s
21:00	✕	0%	7.1m/s
22:00	✕	0%	6.6m/s
23:00	✕	0%	6m/s
Tue, Aug 25
24:00	✕	0%	5.7m/s
01:00	✕	0%	5.2m/s
02:00	✕	0%	5.1m/s
03:00	✕	0%	6.3m/s
04:00	✕	0%	7.5m/s
05:00	✓	0%	8.7m/s
06:00	✓	0%	8.5m/s
07:00	✓	0%	8.2m/s
08:00	✓	0%	7.9m/s
09:00	✕	0%	7.3m/s
10:00	✕	0%	6.7m/s
11:00	✕	0%	6.1m/s
12:00	✕	0%	6.1m/s
13:00	✕	0%	6.1m/s
14:00	✕	0%	6m/s
15:00	✕	0%	6.2m/s
16:00	✕	0%	6.4m/s
17:00	✕	0%	6.6m/s
18:00	✕	0%	6.5m/s
19:00	✕	0%	6.4m/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/Amsterdam	Dew Point °C	Surface Temperature °C	Temperature °C	Time Window	Total Cloud Coverage %	Vapor Pressure Deficit kPa
Sat, Aug 22 Sunrise 06:35 Sunset 20:51
22:00 ☾	8.7°C	17°C	16°C	-	100%	0.64kPa
23:00 ☾	9.2°C	17°C	15°C	-	100%	0.57kPa
Sun, Aug 23 Sunrise 06:35 Sunset 20:51
24:00 ☾	9.4°C	17°C	15°C	-	82%	0.54kPa
01:00 ☾	9.5°C	17°C	15°C	-	34%	0.49kPa
02:00 ☾	9.2°C	16°C	14°C	-	73%	0.43kPa
03:00 ☾	8.5°C	16°C	15°C	-	100%	0.55kPa
04:00 ☾	8.8°C	16°C	15°C	-	91%	0.57kPa
05:00 ☾	8.9°C	16°C	15°C	-	100%	0.55kPa
06:00 ☾	8.9°C	16°C	15°C	-	100%	0.55kPa
07:00	9.1°C	16°C	15°C	-	100%	0.55kPa
08:00	8.8°C	16°C	15°C	-	100%	0.6kPa
09:00	9.8°C	16°C	15°C	-	100%	0.54kPa
10:00	9.7°C	16°C	16°C	-	100%	0.64kPa
11:00	9.6°C	16°C	17°C	-	100%	0.71kPa
12:00	9.5°C	16°C	17°C	-	100%	0.76kPa
13:00	10°C	16°C	18°C	-	100%	0.81kPa
14:00	9.9°C	16°C	18°C	-	40%	0.88kPa
15:00	9.7°C	17°C	19°C	-	39%	0.99kPa
16:00	10°C	17°C	19°C	-	82%	0.95kPa
17:00	10°C	17°C	18°C	-	94%	0.85kPa
18:00	10°C	17°C	18°C	-	38%	0.82kPa
19:00	10°C	17°C	18°C	-	6%	0.8kPa
20:00	10°C	17°C	17°C	-	38%	0.65kPa
21:00 ☾	10°C	17°C	15°C	-	95%	0.43kPa
22:00 ☾	10°C	17°C	14°C	-	96%	0.41kPa
23:00 ☾	10°C	17°C	14°C	-	23%	0.39kPa
Mon, Aug 24 Sunrise 06:36 Sunset 20:49
24:00 ☾	10°C	16°C	14°C	-	5%	0.35kPa
01:00 ☾	11°C	16°C	14°C	-	0%	0.31kPa
02:00 ☾	11°C	16°C	14°C	-	3%	0.28kPa
03:00 ☾	11°C	16°C	14°C	-	5%	0.25kPa
04:00 ☾	11°C	15°C	14°C	-	24%	0.24kPa
05:00 ☾	11°C	15°C	14°C	-	27%	0.24kPa
06:00 ☾	11°C	15°C	13°C	-	20%	0.23kPa
07:00	11°C	15°C	13°C	-	5%	0.22kPa
08:00	12°C	15°C	15°C	-	4%	0.36kPa
09:00	12°C	15°C	18°C	-	5%	0.62kPa
10:00	12°C	15°C	19°C	-	6%	0.8kPa
11:00	11°C	16°C	20°C	-	42%	0.93kPa
12:00	11°C	16°C	20°C	-	79%	1.1kPa
13:00	10°C	16°C	20°C	-	88%	1.1kPa
14:00	10°C	17°C	20°C	-	71%	1.1kPa
15:00	10°C	17°C	21°C	-	5%	1.2kPa
16:00	11°C	17°C	22°C	-	5%	1.3kPa
17:00	11°C	18°C	21°C	-	5%	1.1kPa
18:00	12°C	18°C	20°C	-	5%	0.91kPa
19:00	12°C	18°C	19°C	-	5%	0.76kPa
20:00	13°C	18°C	18°C	-	4%	0.56kPa
21:00 ☾	13°C	18°C	17°C	-	55%	0.44kPa
22:00 ☾	13°C	18°C	16°C	-	100%	0.37kPa
23:00 ☾	13°C	17°C	16°C	-	19%	0.32kPa
Tue, Aug 25 Sunrise 06:38 Sunset 20:47
24:00 ☾	13°C	17°C	15°C	-	0%	0.23kPa
01:00 ☾	12°C	17°C	15°C	-	0%	0.25kPa
02:00 ☾	12°C	17°C	14°C	-	1%	0.26kPa
03:00 ☾	12°C	3253°C	16°C	-	29%	0.45kPa
04:00 ☾	12°C	6490°C	18°C	-	58%	0.67kPa
05:00 ☾	11°C	9726°C	20°C	-	86%	0.95kPa
06:00 ☾	11°C	9726°C	21°C	-	59%	1.1kPa
07:00	11°C	9726°C	22°C	-	32%	1.3kPa
08:00	11°C	9726°C	23°C	-	5%	1.5kPa
09:00	11°C	9726°C	23°C	-	13%	1.5kPa
10:00	11°C	9726°C	24°C	-	21%	1.6kPa
11:00	11°C	9726°C	24°C	-	30%	1.7kPa
12:00	12°C	9726°C	24°C	-	51%	1.6kPa
13:00	13°C	9726°C	24°C	-	72%	1.4kPa
14:00	13°C	9726°C	23°C	-	94%	1.3kPa
15:00	13°C	9726°C	23°C	-	77%	1.3kPa
16:00	13°C	9726°C	22°C	-	61%	1.2kPa
17:00	13°C	9726°C	22°C	-	45%	1.1kPa
18:00	13°C	9726°C	21°C	-	59%	1kPa
19:00	13°C	9726°C	21°C	-	73%	0.92kPa
20:00	13°C	9726°C	20°C	-	87%	0.84kPa
21:00 ☾	13°C	9726°C	20°C	-	91%	0.78kPa

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 22, 2026, 7:10 PM UTC

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