Sijsele climate — normals and trends
Sijsele (Belgium) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.6 °C and it receives 697 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 August (17.6 °C on average) and the coldest is January (3.8 °C). Rainfall peaks in November.
Sijsele averages 28 frost days, 1 hot days (≥ 30 °C) and 141 rainy days per year.
Sijsele 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 42 to 14 per year over the period.
The hottest day of the period reached 37.5 °C (on 25 July 2019) and the coldest -16.2 °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
SijseleFlanders
- coords
- 51.21°, 3.32°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.6°C
Average daily high
13.2°C
Average daily low
8.1°C
Annual rainfall
697mm
Sunshine / day
8.3h
Mean relative humidity
81%
Average peak wind
23.6km/h
Seasonal range
13.8°C
Frost days (< 0 °C)
28 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
141 d/yr
Annual snowfall
11.6 cm
Average feels-like high
10.5 °C
Average feels-like low
4.8 °C
Average peak gust
41.6 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
11.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.47 · 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
37.5 °C
25 July 2019
Coldest day
-16.2 °C
6 January 1979
Wettest day
77 mm
29 August 1996
Windiest day
72.9 km/h
25 January 1990
Strongest gust
133.2 km/h
18 January 2007
Hottest feels-like
39.0 °C
25 July 2019
Coldest feels-like
-21.3 °C
22 January 1942
Snowiest day
14.8 cm
11 December 2017
Sunniest day
16.0 h
18 June 1940
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 | 6.1 °C | +0.5 °C | 94 mm | +37 mm |
| Feb | 7.0 °C | +0.7 °C | 42 mm | -5 mm |
| Mar | 11.9 °C | +2.8 °C | 5 mm | -46 mm |
| Apr | 15.9 °C | +3.7 °C | 20 mm | -26 mm |
| May | 17.6 °C | +1.8 °C | 30 mm | -26 mm |
| Jun | 21.9 °C | +3.3 °C | 50 mm | -5 mm |
| Jul | 22.2 °C | +1.7 °C | 92 mm | +29 mm |
| Aug | 22.3 °C | +1.6 °C | 34 mm | -29 mm |
| Sep | 19.3 °C | +0.9 °C | 38 mm | -23 mm |
| Oct | 14.9 °C | +0.4 °C | 79 mm | +13 mm |
| Nov | 10.9 °C | +1.3 °C | 63 mm | -7 mm |
| Dec | 8.7 °C | +1.9 °C | 30 mm | -34 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 Sijsele?
Sijsele has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.6 °C and it receives 697 mm of precipitation per year.
What is the hottest day ever recorded in Sijsele?
The hottest day measured in Sijsele between 1940 and 2025 was 25 July 2019, reaching 37.5 °C.
What is the coldest day in Sijsele?
The coldest day measured in Sijsele between 1940 and 2025 was 6 January 1979, at -16.2 °C.
Does it snow in Sijsele?
Yes. Sijsele gets on average 11.6 cm of snow per year and has around 28 frost days.
Has the climate of Sijsele warmed?
Yes: Sijsele warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sijsele?
The wettest day measured in Sijsele between 1940 and 2025 was 29 August 1996, with 77 mm of rain in 24 hours.
What was the windiest day in Sijsele?
The windiest day measured in Sijsele between 1940 and 2025 was 25 January 1990, with winds reaching 72.9 km/h.
What is the warmest month in Sijsele?
The warmest month in Sijsele is August (17.6 °C on average); the coldest is January (3.8 °C).
How much does it rain in Sijsele?
Sijsele receives on average 697 mm of precipitation per year, spread over about 141 rainy days.
Is it sunny in Sijsele?
Sijsele gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sijsele?
The heaviest 24-hour snowfall measured in Sijsele between 1940 and 2025 was 11 December 2017, with 14.8 cm.
Are there tropical nights in Sijsele?
Yes: Sijsele has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sijsele?
In Sijsele, between 1940 and 2025, the highest apparent temperature reached 39.0 °C on 25 July 2019, and the lowest was -21.3 °C on 22 January 1942.
Compare Sijsele with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sijsele