Kalmthout climate — normals and trends
Kalmthout (Belgium) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.3 °C and it receives 738 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 (17.8 °C on average) and the coldest is January (2.9 °C). Rainfall peaks in July.
Kalmthout averages 42 frost days, 3 hot days (≥ 30 °C) and 143 rainy days per year.
Kalmthout 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 57 to 27 per year over the period.
The hottest day of the period reached 39.0 °C (on 25 July 2019) and the coldest -21.5 °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
KalmthoutFlanders
- coords
- 51.38°, 4.48°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.3°C
Average daily high
13.5°C
Average daily low
7.1°C
Annual rainfall
738mm
Sunshine / day
7.7h
Mean relative humidity
80%
Average peak wind
20.2km/h
Seasonal range
14.9°C
Frost days (< 0 °C)
42 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
143 d/yr
Annual snowfall
15.3 cm
Average feels-like high
11.0 °C
Average feels-like low
4.3 °C
Average peak gust
39.3 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.46 · 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
39.0 °C
25 July 2019
Coldest day
-21.5 °C
27 January 1942
Wettest day
54 mm
24 August 2002
Windiest day
63.8 km/h
25 January 1990
Strongest gust
132.1 km/h
25 January 1990
Hottest feels-like
40.2 °C
25 July 2019
Coldest feels-like
-26.9 °C
27 January 1942
Snowiest day
15.8 cm
27 December 2014
Sunniest day
15.9 h
1 July 2025
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 | 5.7 °C | +0.7 °C | 103 mm | +43 mm |
| Feb | 7.1 °C | +1.1 °C | 40 mm | -12 mm |
| Mar | 12.9 °C | +3.5 °C | 7 mm | -49 mm |
| Apr | 17.1 °C | +4.0 °C | 25 mm | -26 mm |
| May | 19.7 °C | +2.6 °C | 34 mm | -31 mm |
| Jun | 23.6 °C | +3.7 °C | 51 mm | -14 mm |
| Jul | 23.8 °C | +2.2 °C | 83 mm | +9 mm |
| Aug | 23.9 °C | +2.4 °C | 22 mm | -46 mm |
| Sep | 20.0 °C | +1.3 °C | 48 mm | -10 mm |
| Oct | 14.8 °C | +0.4 °C | 90 mm | +29 mm |
| Nov | 10.6 °C | +1.5 °C | 60 mm | -5 mm |
| Dec | 8.5 °C | +2.4 °C | 27 mm | -38 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 Kalmthout?
Kalmthout has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.3 °C and it receives 738 mm of precipitation per year.
What is the hottest day ever recorded in Kalmthout?
The hottest day measured in Kalmthout between 1940 and 2025 was 25 July 2019, reaching 39.0 °C.
What is the coldest day in Kalmthout?
The coldest day measured in Kalmthout between 1940 and 2025 was 27 January 1942, at -21.5 °C.
Does it snow in Kalmthout?
Yes. Kalmthout gets on average 15.3 cm of snow per year and has around 42 frost days.
Has the climate of Kalmthout warmed?
Yes: Kalmthout warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Kalmthout?
The wettest day measured in Kalmthout between 1940 and 2025 was 24 August 2002, with 54 mm of rain in 24 hours.
What was the windiest day in Kalmthout?
The windiest day measured in Kalmthout between 1940 and 2025 was 25 January 1990, with winds reaching 63.8 km/h.
What is the warmest month in Kalmthout?
The warmest month in Kalmthout is July (17.8 °C on average); the coldest is January (2.9 °C).
How much does it rain in Kalmthout?
Kalmthout receives on average 738 mm of precipitation per year, spread over about 143 rainy days.
Is it sunny in Kalmthout?
Kalmthout 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 Kalmthout?
The heaviest 24-hour snowfall measured in Kalmthout between 1940 and 2025 was 27 December 2014, with 15.8 cm.
Are there tropical nights in Kalmthout?
Yes: Kalmthout has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Kalmthout?
In Kalmthout, between 1940 and 2025, the highest apparent temperature reached 40.2 °C on 25 July 2019, and the lowest was -26.9 °C on 27 January 1942.
Compare Kalmthout with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Kalmthout