As climate — normals and trends
As (Belgium) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.3 °C and it receives 766 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 (18.2 °C on average) and the coldest is January (2.5 °C). Rainfall peaks in July.
As averages 49 frost days, 5 hot days (≥ 30 °C) and 147 rainy days per year.
As has warmed by +2.1 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The number of frost days there went from about 64 to 34 per year over the period.
The hottest day of the period reached 41.8 °C (on 25 July 2019) and the coldest -22.5 °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
AsFlanders
- coords
- 51.01°, 5.58°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.3°C
Average daily high
13.8°C
Average daily low
6.9°C
Annual rainfall
766mm
Sunshine / day
7.6h
Mean relative humidity
78%
Average peak wind
18.1km/h
Seasonal range
15.7°C
Frost days (< 0 °C)
49 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
147 d/yr
Annual snowfall
19.9 cm
Average feels-like high
11.4 °C
Average feels-like low
4.2 °C
Average peak gust
37.4 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °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
41.8 °C
25 July 2019
Coldest day
-22.5 °C
27 January 1942
Wettest day
57 mm
21 June 2021
Windiest day
54.9 km/h
25 January 1990
Strongest gust
124.9 km/h
18 January 2007
Hottest feels-like
42.5 °C
25 July 2019
Coldest feels-like
-28.3 °C
27 January 1942
Snowiest day
11.8 cm
24 January 1942
Sunniest day
15.7 h
29 June 2019
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 | 5.2 °C | +0.5 °C | 149 mm | +86 mm |
| Feb | 7.2 °C | +1.3 °C | 37 mm | -21 mm |
| Mar | 13.4 °C | +3.7 °C | 12 mm | -49 mm |
| Apr | 17.5 °C | +3.9 °C | 49 mm | -6 mm |
| May | 20.6 °C | +2.8 °C | 49 mm | -16 mm |
| Jun | 24.7 °C | +4.0 °C | 71 mm | +2 mm |
| Jul | 24.9 °C | +2.5 °C | 88 mm | +14 mm |
| Aug | 25.1 °C | +2.9 °C | 25 mm | -43 mm |
| Sep | 20.0 °C | +0.9 °C | 90 mm | +32 mm |
| Oct | 14.4 °C | 0.0 °C | 77 mm | +17 mm |
| Nov | 10.6 °C | +1.7 °C | 57 mm | -9 mm |
| Dec | 8.3 °C | +2.6 °C | 34 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 As?
As has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.3 °C and it receives 766 mm of precipitation per year.
What is the hottest day ever recorded in As?
The hottest day measured in As between 1940 and 2025 was 25 July 2019, reaching 41.8 °C.
What is the coldest day in As?
The coldest day measured in As between 1940 and 2025 was 27 January 1942, at -22.5 °C.
Does it snow in As?
Yes. As gets on average 19.9 cm of snow per year and has around 49 frost days.
Has the climate of As warmed?
Yes: As warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in As?
The wettest day measured in As between 1940 and 2025 was 21 June 2021, with 57 mm of rain in 24 hours.
What was the windiest day in As?
The windiest day measured in As between 1940 and 2025 was 25 January 1990, with winds reaching 54.9 km/h.
What is the warmest month in As?
The warmest month in As is July (18.2 °C on average); the coldest is January (2.5 °C).
How much does it rain in As?
As receives on average 766 mm of precipitation per year, spread over about 147 rainy days.
Is it sunny in As?
As 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 As?
The heaviest 24-hour snowfall measured in As between 1940 and 2025 was 24 January 1942, with 11.8 cm.
Are there tropical nights in As?
Yes: As has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in As?
In As, between 1940 and 2025, the highest apparent temperature reached 42.5 °C on 25 July 2019, and the lowest was -28.3 °C on 27 January 1942.
Compare As with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around As