Deerlijk climate — normals and trends
Deerlijk (Belgium) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.4 °C and it receives 709 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 (17.7 °C on average) and the coldest is January (3.3 °C). Rainfall peaks in November.
Deerlijk averages 40 frost days, 2 hot days (≥ 30 °C) and 139 rainy days per year.
Deerlijk has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 55 to 25 per year over the period.
The hottest day of the period reached 38.8 °C (on 25 July 2019) and the coldest -20.0 °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
DeerlijkFlanders
- coords
- 50.85°, 3.35°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.4°C
Average daily high
13.7°C
Average daily low
7.3°C
Annual rainfall
709mm
Sunshine / day
7.8h
Mean relative humidity
80%
Average peak wind
19.1km/h
Seasonal range
14.4°C
Frost days (< 0 °C)
40 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
139 d/yr
Annual snowfall
14.1 cm
Average feels-like high
11.3 °C
Average feels-like low
4.5 °C
Average peak gust
39.0 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.46 · 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
38.8 °C
25 July 2019
Coldest day
-20.0 °C
6 January 1979
Wettest day
66 mm
29 August 1996
Windiest day
58.4 km/h
25 January 1990
Strongest gust
127.8 km/h
18 January 2007
Hottest feels-like
39.4 °C
25 July 2019
Coldest feels-like
-24.4 °C
6 January 1979
Snowiest day
13.4 cm
20 February 1957
Sunniest day
16.0 h
25 June 1949
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 | +0.3 °C | 133 mm | +73 mm |
| Feb | 7.0 °C | +0.5 °C | 45 mm | -6 mm |
| Mar | 12.9 °C | +3.0 °C | 9 mm | -46 mm |
| Apr | 17.3 °C | +4.1 °C | 23 mm | -29 mm |
| May | 19.0 °C | +2.0 °C | 39 mm | -24 mm |
| Jun | 23.5 °C | +3.7 °C | 50 mm | -10 mm |
| Jul | 23.7 °C | +2.0 °C | 78 mm | +15 mm |
| Aug | 23.7 °C | +2.1 °C | 27 mm | -34 mm |
| Sep | 19.8 °C | +0.9 °C | 44 mm | -11 mm |
| Oct | 15.0 °C | +0.4 °C | 71 mm | +10 mm |
| Nov | 10.8 °C | +1.4 °C | 54 mm | -12 mm |
| Dec | 8.6 °C | +2.2 °C | 36 mm | -27 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 Deerlijk?
Deerlijk has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.4 °C and it receives 709 mm of precipitation per year.
What is the hottest day ever recorded in Deerlijk?
The hottest day measured in Deerlijk between 1940 and 2025 was 25 July 2019, reaching 38.8 °C.
What is the coldest day in Deerlijk?
The coldest day measured in Deerlijk between 1940 and 2025 was 6 January 1979, at -20.0 °C.
Does it snow in Deerlijk?
Yes. Deerlijk gets on average 14.1 cm of snow per year and has around 40 frost days.
Has the climate of Deerlijk warmed?
Yes: Deerlijk warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Deerlijk?
The wettest day measured in Deerlijk between 1940 and 2025 was 29 August 1996, with 66 mm of rain in 24 hours.
What was the windiest day in Deerlijk?
The windiest day measured in Deerlijk between 1940 and 2025 was 25 January 1990, with winds reaching 58.4 km/h.
What is the warmest month in Deerlijk?
The warmest month in Deerlijk is July (17.7 °C on average); the coldest is January (3.3 °C).
How much does it rain in Deerlijk?
Deerlijk receives on average 709 mm of precipitation per year, spread over about 139 rainy days.
Is it sunny in Deerlijk?
Deerlijk gets on average 7.8 hours of sunshine per day, roughly 2,847 hours per year over 1940-2025.
What is the biggest single-day snowfall in Deerlijk?
The heaviest 24-hour snowfall measured in Deerlijk between 1940 and 2025 was 20 February 1957, with 13.4 cm.
Are there tropical nights in Deerlijk?
Yes: Deerlijk has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Deerlijk?
In Deerlijk, between 1940 and 2025, the highest apparent temperature reached 39.4 °C on 25 July 2019, and the lowest was -24.4 °C on 6 January 1979.
Compare Deerlijk with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Deerlijk