Rule Morning Frost

Morning Frost Forecast for Haarlem, The Netherlands

Haarlem, North Holland, The Netherlands

Gabled houses, the Grote Markt and the River Spaarne provide layered street scenes, waterside facades and church-tower sightlines.

Currently

Real-time conditions

Frost Probability

Soil Temperature17.3°C

Dew Point9.2°C (moderate dew point)

Wind Speed4.9m/s (calm conditions)

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 Speed92% 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 Haarlem.

Explore Morning Frost conditions across The Netherlands →

Recorded match history

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

Last 30 days

recorded matching windows

Last 90 days

recorded matching windows

Last 365 days

recorded matching window · 68% average confidence

Only 1 completed match is 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.

Create your own Morning Frost alerts

Get notified when these conditions match at your own locations.

Get this template

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%	4.3m/s
08:00	✓	0%	4.8m/s
09:00	✕	0%	4.1m/s
10:00	✕	0%	5m/s
11:00	✕	0%	6m/s
12:00	✕	0%	5.9m/s
13:00	✕	0%	6.7m/s
14:00	✕	0%	6.8m/s
15:00	✕	0%	7.3m/s
16:00	✕	0%	7.1m/s
17:00	✕	0%	6.8m/s
18:00	✕	0%	6.3m/s
19:00	✕	0%	5.8m/s
20:00	✕	0%	4.8m/s
21:00	✕	0%	4.9m/s
22:00	✕	0%	4.9m/s
23:00	✕	0%	5.1m/s
Sun, Aug 23
24:00	✕	0%	4.5m/s
01:00	✕	0%	4.4m/s
02:00	✕	0%	4.4m/s
03:00	✕	0%	4m/s
04:00	✕	0%	4.3m/s
05:00	✓	0%	4.1m/s
06:00	✓	0%	4.1m/s
07:00	✓	0%	3.9m/s
08:00	✓	0%	4.1m/s
09:00	✕	0%	4.1m/s
10:00	✕	0%	4.4m/s
11:00	✕	0%	4.8m/s
12:00	✕	0%	4.7m/s
13:00	✕	0%	4.8m/s
14:00	✕	0%	5.2m/s
15:00	✕	0%	5.9m/s
16:00	✕	0%	5.6m/s
17:00	✕	0%	5.4m/s
18:00	✕	0%	5m/s
19:00	✕	0%	4.6m/s
20:00	✕	0%	3.7m/s
21:00	✕	0%	3m/s
22:00	✕	0%	2.6m/s
23:00	✕	0%	2.3m/s
Mon, Aug 24
24:00	✕	0%	2.1m/s
01:00	✕	0%	1.8m/s
02:00	✕	0%	1.6m/s
03:00	✕	0%	1.1m/s
04:00	✕	0%	1.2m/s
05:00	✓	0%	1m/s
06:00	✓	0%	0.32m/s
07:00	✓	0%	0.31m/s
08:00	✓	0%	0.68m/s
09:00	✕	0%	2m/s
10:00	✕	0%	2.9m/s
11:00	✕	0%	2.9m/s
12:00	✕	0%	3.3m/s
13:00	✕	0%	3.6m/s
14:00	✕	0%	4m/s
15:00	✕	0%	4m/s
16:00	✕	0%	4.2m/s
17:00	✕	0%	4.5m/s
18:00	✕	0%	5.3m/s
19:00	✕	0%	5.9m/s
20:00	✕	0%	5.6m/s
21:00	✕	0%	5.9m/s
22:00	✕	0%	6.4m/s
23:00	✕	0%	6.1m/s
Tue, Aug 25
24:00	✕	0%	5.6m/s
01:00	✕	0%	5m/s
02:00	✕	0%	4.5m/s
03:00	✕	0%	5.9m/s
04:00	✕	0%	7.3m/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 06:36 Sunset 20:51
22:00 ☾	9.2°C	17°C	16°C	-	100%	0.63kPa
23:00 ☾	9.5°C	17°C	15°C	-	100%	0.57kPa
Sun, Aug 23 Sunrise 06:36 Sunset 20:51
24:00 ☾	9.6°C	17°C	15°C	-	100%	0.54kPa
01:00 ☾	9.7°C	17°C	15°C	-	100%	0.53kPa
02:00 ☾	9.5°C	17°C	15°C	-	29%	0.53kPa
03:00 ☾	8.9°C	16°C	14°C	-	44%	0.45kPa
04:00 ☾	8.9°C	16°C	14°C	-	97%	0.49kPa
05:00 ☾	8.8°C	16°C	15°C	-	100%	0.57kPa
06:00 ☾	8.8°C	16°C	15°C	-	100%	0.58kPa
07:00	8.8°C	16°C	15°C	-	100%	0.58kPa
08:00	9.1°C	16°C	15°C	-	100%	0.58kPa
09:00	9.5°C	16°C	16°C	-	100%	0.59kPa
10:00	9.9°C	16°C	16°C	-	100%	0.62kPa
11:00	9.6°C	16°C	17°C	-	100%	0.71kPa
12:00	9.5°C	16°C	17°C	-	100%	0.79kPa
13:00	9.5°C	17°C	18°C	-	100%	0.83kPa
14:00	9.9°C	17°C	18°C	-	98%	0.84kPa
15:00	9.7°C	17°C	19°C	-	46%	0.94kPa
16:00	9.2°C	17°C	19°C	-	53%	1kPa
17:00	9.9°C	18°C	19°C	-	63%	0.92kPa
18:00	10°C	18°C	18°C	-	55%	0.82kPa
19:00	10°C	18°C	18°C	-	25%	0.78kPa
20:00	11°C	18°C	17°C	-	48%	0.64kPa
21:00 ☾	10°C	17°C	15°C	-	80%	0.45kPa
22:00 ☾	10°C	17°C	14°C	-	62%	0.39kPa
23:00 ☾	10°C	17°C	14°C	-	12%	0.34kPa
Mon, Aug 24 Sunrise 06:37 Sunset 20:49
24:00 ☾	10°C	16°C	14°C	-	5%	0.31kPa
01:00 ☾	10°C	16°C	13°C	-	0%	0.28kPa
02:00 ☾	10°C	16°C	13°C	-	0%	0.27kPa
03:00 ☾	10°C	15°C	13°C	-	4%	0.26kPa
04:00 ☾	10°C	15°C	13°C	-	4%	0.25kPa
05:00 ☾	11°C	15°C	13°C	-	5%	0.23kPa
06:00 ☾	11°C	15°C	13°C	-	5%	0.22kPa
07:00	11°C	14°C	13°C	-	6%	0.21kPa
08:00	11°C	14°C	15°C	-	5%	0.32kPa
09:00	12°C	15°C	17°C	-	9%	0.53kPa
10:00	11°C	15°C	18°C	-	9%	0.8kPa
11:00	11°C	16°C	20°C	-	41%	0.98kPa
12:00	11°C	16°C	20°C	-	89%	1.1kPa
13:00	10°C	17°C	20°C	-	89%	1.2kPa
14:00	9.4°C	17°C	21°C	-	5%	1.3kPa
15:00	9.2°C	18°C	22°C	-	5%	1.5kPa
16:00	9.4°C	19°C	22°C	-	8%	1.5kPa
17:00	9.7°C	19°C	22°C	-	11%	1.5kPa
18:00	10°C	19°C	22°C	-	5%	1.3kPa
19:00	11°C	19°C	20°C	-	9%	1kPa
20:00	12°C	19°C	19°C	-	76%	0.71kPa
21:00 ☾	12°C	19°C	17°C	-	100%	0.56kPa
22:00 ☾	12°C	19°C	17°C	-	30%	0.51kPa
23:00 ☾	12°C	18°C	16°C	-	5%	0.41kPa
Tue, Aug 25 Sunrise 06:39 Sunset 20:47
24:00 ☾	12°C	18°C	16°C	-	3%	0.36kPa
01:00 ☾	12°C	18°C	15°C	-	2%	0.36kPa
02:00 ☾	11°C	17°C	15°C	-	75%	0.36kPa
03:00 ☾	11°C	3254°C	16°C	-	78%	0.52kPa
04:00 ☾	11°C	6490°C	18°C	-	82%	0.72kPa
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

Get Notified of Opportunities

Create your own custom alerts for this location and more.

Create Free Account