Harmelen climate — normals and trends
Harmelen (The Netherlands) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.0 °C and it receives 742 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (17.5 °C on average) and the coldest is January (2.7 °C). Rainfall peaks in July.
Harmelen averages 44 frost days, 2 hot days (≥ 30 °C) and 145 rainy days per year.
Harmelen has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 58 to 30 per year over the period.
The hottest day of the period reached 37.9 °C (on 25 July 2019) and the coldest -22.4 °C (on 27 January 1942).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
HarmelenUtrecht
- coords
- 52.09°, 4.96°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.0°C
Average daily high
13.2°C
Average daily low
7.0°C
Annual rainfall
742mm
Sunshine / day
7.7h
Mean relative humidity
81%
Average peak wind
20.5km/h
Seasonal range
14.8°C
Frost days (< 0 °C)
44 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
145 d/yr
Annual snowfall
16.5 cm
Average feels-like high
10.7 °C
Average feels-like low
4.1 °C
Average peak gust
38.9 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.45 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
37.9 °C
25 July 2019
Coldest day
-22.4 °C
27 January 1942
Wettest day
50 mm
6 July 1968
Windiest day
68.6 km/h
25 January 1990
Strongest gust
130.0 km/h
18 January 2007
Hottest feels-like
40.2 °C
25 July 2019
Coldest feels-like
-27.9 °C
27 January 1942
Snowiest day
14.1 cm
7 February 2021
Sunniest day
16.0 h
28 June 2010
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 5.6 °C | +0.9 °C | 86 mm | +26 mm |
| Feb | 6.8 °C | +1.1 °C | 38 mm | -13 mm |
| Mar | 12.6 °C | +3.5 °C | 6 mm | -49 mm |
| Apr | 16.2 °C | +3.4 °C | 30 mm | -22 mm |
| May | 18.6 °C | +1.8 °C | 38 mm | -24 mm |
| Jun | 22.4 °C | +2.9 °C | 66 mm | +1 mm |
| Jul | 23.0 °C | +1.8 °C | 107 mm | +32 mm |
| Aug | 23.0 °C | +1.8 °C | 28 mm | -44 mm |
| Sep | 19.3 °C | +0.9 °C | 68 mm | +7 mm |
| Oct | 14.5 °C | +0.5 °C | 91 mm | +31 mm |
| Nov | 10.3 °C | +1.4 °C | 64 mm | -2 mm |
| Dec | 8.4 °C | +2.5 °C | 29 mm | -35 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Harmelen?
Harmelen has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.0 °C and it receives 742 mm of precipitation per year.
What is the hottest day ever recorded in Harmelen?
The hottest day measured in Harmelen between 1940 and 2025 was 25 July 2019, reaching 37.9 °C.
What is the coldest day in Harmelen?
The coldest day measured in Harmelen between 1940 and 2025 was 27 January 1942, at -22.4 °C.
Does it snow in Harmelen?
Yes. Harmelen gets on average 16.5 cm of snow per year and has around 44 frost days.
Has the climate of Harmelen warmed?
Yes: Harmelen warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Harmelen?
The wettest day measured in Harmelen between 1940 and 2025 was 6 July 1968, with 50 mm of rain in 24 hours.
What was the windiest day in Harmelen?
The windiest day measured in Harmelen between 1940 and 2025 was 25 January 1990, with winds reaching 68.6 km/h.
What is the warmest month in Harmelen?
The warmest month in Harmelen is July (17.5 °C on average); the coldest is January (2.7 °C).
How much does it rain in Harmelen?
Harmelen receives on average 742 mm of precipitation per year, spread over about 145 rainy days.
Is it sunny in Harmelen?
Harmelen gets on average 7.7 hours of sunshine per day, roughly 2,811 hours per year over 1940-2025.
What is the biggest single-day snowfall in Harmelen?
The heaviest 24-hour snowfall measured in Harmelen between 1940 and 2025 was 7 February 2021, with 14.1 cm.
Are there tropical nights in Harmelen?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Harmelen.
What was the most extreme apparent temperature in Harmelen?
In Harmelen, between 1940 and 2025, the highest apparent temperature reached 40.2 °C on 25 July 2019, and the lowest was -27.9 °C on 27 January 1942.
Compare Harmelen with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Harmelen