Grimbergen climate — normals and trends
Grimbergen (Belgium) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.4 °C and it receives 714 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 (17.9 °C on average) and the coldest is January (3.0 °C). Rainfall peaks in July.
Grimbergen averages 42 frost days, 3 hot days (≥ 30 °C) and 140 rainy days per year.
Grimbergen has warmed by +1.9 °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 57 to 27 per year over the period.
The hottest day of the period reached 38.9 °C (on 25 July 2019) and the coldest -20.7 °C (on 6 January 1979).
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
GrimbergenFlanders
- coords
- 50.93°, 4.37°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.4°C
Average daily high
13.7°C
Average daily low
7.2°C
Annual rainfall
714mm
Sunshine / day
7.6h
Mean relative humidity
79%
Average peak wind
19.4km/h
Seasonal range
14.9°C
Frost days (< 0 °C)
42 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
140 d/yr
Annual snowfall
14.8 cm
Average feels-like high
11.3 °C
Average feels-like low
4.4 °C
Average peak gust
38.2 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.44 · 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
38.9 °C
25 July 2019
Coldest day
-20.7 °C
6 January 1979
Wettest day
74 mm
29 August 1996
Windiest day
59.8 km/h
25 January 1990
Strongest gust
127.4 km/h
18 January 2007
Hottest feels-like
41.6 °C
25 July 2019
Coldest feels-like
-25.8 °C
27 January 1942
Snowiest day
13.5 cm
20 February 1957
Sunniest day
15.9 h
25 June 2023
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 | +0.5 °C | 137 mm | +79 mm |
| Feb | 7.3 °C | +1.0 °C | 49 mm | -3 mm |
| Mar | 13.1 °C | +3.3 °C | 10 mm | -45 mm |
| Apr | 17.3 °C | +3.9 °C | 26 mm | -25 mm |
| May | 19.7 °C | +2.3 °C | 42 mm | -22 mm |
| Jun | 24.1 °C | +3.9 °C | 50 mm | -14 mm |
| Jul | 24.3 °C | +2.3 °C | 77 mm | +7 mm |
| Aug | 24.4 °C | +2.6 °C | 27 mm | -38 mm |
| Sep | 20.5 °C | +1.5 °C | 41 mm | -13 mm |
| Oct | 15.0 °C | +0.4 °C | 74 mm | +16 mm |
| Nov | 10.9 °C | +1.7 °C | 52 mm | -10 mm |
| Dec | 8.7 °C | +2.5 °C | 27 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 Grimbergen?
Grimbergen has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.4 °C and it receives 714 mm of precipitation per year.
What is the hottest day ever recorded in Grimbergen?
The hottest day measured in Grimbergen between 1940 and 2025 was 25 July 2019, reaching 38.9 °C.
What is the coldest day in Grimbergen?
The coldest day measured in Grimbergen between 1940 and 2025 was 6 January 1979, at -20.7 °C.
Does it snow in Grimbergen?
Yes. Grimbergen gets on average 14.8 cm of snow per year and has around 42 frost days.
Has the climate of Grimbergen warmed?
Yes: Grimbergen warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Grimbergen?
The wettest day measured in Grimbergen between 1940 and 2025 was 29 August 1996, with 74 mm of rain in 24 hours.
What was the windiest day in Grimbergen?
The windiest day measured in Grimbergen between 1940 and 2025 was 25 January 1990, with winds reaching 59.8 km/h.
What is the warmest month in Grimbergen?
The warmest month in Grimbergen is July (17.9 °C on average); the coldest is January (3.0 °C).
How much does it rain in Grimbergen?
Grimbergen receives on average 714 mm of precipitation per year, spread over about 140 rainy days.
Is it sunny in Grimbergen?
Grimbergen gets on average 7.6 hours of sunshine per day, roughly 2,774 hours per year over 1940-2025.
What is the biggest single-day snowfall in Grimbergen?
The heaviest 24-hour snowfall measured in Grimbergen between 1940 and 2025 was 20 February 1957, with 13.5 cm.
Are there tropical nights in Grimbergen?
Yes: Grimbergen has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Grimbergen?
In Grimbergen, between 1940 and 2025, the highest apparent temperature reached 41.6 °C on 25 July 2019, and the lowest was -25.8 °C on 27 January 1942.
Compare Grimbergen with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Grimbergen