Bost climate — normals and trends
Bost has a temperate oceanic climate, averaging 10.0 °C annually with 792 mm of rain per year.
Climate normals · ERA5
BostFlanders
- coords
- 50.79°, 4.94°
- period
- 1940–2025 · 86 yrs
The normals for this period
The average of every indicator across the whole window: temperature, water, sky, wind and notable days.
Mean daily temperature
10.0°C
Average daily high
13.4°C
Average daily low
6.5°C
Annual rainfall
792mm
Sunshine / day
7.4h
Mean relative humidity
80%
Average peak wind
20.0km/h
Seasonal range
15.3°C
Frost days (< 0 °C)
52 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
150 d/yr
Annual snowfall
21.8 cm
Average feels-like high
10.9 °C
Average feels-like low
3.5 °C
Average peak gust
38.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.8 MJ/m²
Has the climate changed?
What the yearly averages say about warming here, and whether the slope is statistically solid.
+2.0 °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).
Climate month by month
How an average year unfolds: when it rains, when it turns hot, when the sun is out.
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
The most extreme days ever measured here, then the year-by-year detail.
Hottest day
38.7 °C
25 July 2019
Coldest day
-22.2 °C
3 February 1942
Wettest day
59 mm
22 June 2023
Windiest day
59.0 km/h
25 January 1990
Strongest gust
123.8 km/h
18 January 2007
Hottest feels-like
41.0 °C
25 July 2019
Coldest feels-like
-27.9 °C
27 January 1942
Snowiest day
11.3 cm
15 February 1987
Sunniest day
15.7 h
2 July 2018
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and compare it with the normal: warmer, drier, more extreme?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 4.9 °C | +0.4 °C | 164 mm | +99 mm |
| Feb | 7.0 °C | +1.2 °C | 40 mm | -18 mm |
| Mar | 12.9 °C | +3.4 °C | 12 mm | -50 mm |
| Apr | 16.8 °C | +3.7 °C | 41 mm | -16 mm |
| May | 19.5 °C | +2.4 °C | 53 mm | -18 mm |
| Jun | 23.6 °C | +3.6 °C | 75 mm | +1 mm |
| Jul | 23.7 °C | +1.9 °C | 88 mm | +12 mm |
| Aug | 24.2 °C | +2.6 °C | 40 mm | -32 mm |
| Sep | 19.4 °C | +0.8 °C | 82 mm | +22 mm |
| Oct | 14.1 °C | 0.0 °C | 72 mm | +10 mm |
| Nov | 10.4 °C | +1.7 °C | 65 mm | -2 mm |
| Dec | 8.2 °C | +2.6 °C | 31 mm | -37 mm |
The year's extremes
What was the weather like that day?
The weather actually measured on a given date, anywhere in the covered window.
Bost (Belgium) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.0 °C and it receives 792 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 (2.4 °C). Rainfall peaks in July.
Bost averages 52 frost days, 3 hot days (≥ 30 °C) and 150 rainy days per year.
Bost 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 69 to 35 per year over the period.
The hottest day of the period reached 38.7 °C (on 25 July 2019) and the coldest -22.2 °C (on 3 February 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.
Frequently asked questions
What is the climate of Bost?
Bost has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.0 °C and it receives 792 mm of precipitation per year.
What is the hottest day ever recorded in Bost?
The hottest day measured in Bost between 1940 and 2025 was 25 July 2019, reaching 38.7 °C.
What is the coldest day in Bost?
The coldest day measured in Bost between 1940 and 2025 was 3 February 1942, at -22.2 °C.
Does it snow in Bost?
Yes. Bost gets on average 21.8 cm of snow per year and has around 52 frost days.
Has the climate of Bost warmed?
Yes: Bost warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bost?
The wettest day measured in Bost between 1940 and 2025 was 22 June 2023, with 59 mm of rain in 24 hours.
What was the windiest day in Bost?
The windiest day measured in Bost between 1940 and 2025 was 25 January 1990, with winds reaching 59.0 km/h.
What is the warmest month in Bost?
The warmest month in Bost is July (17.7 °C on average); the coldest is January (2.4 °C).
How much does it rain in Bost?
Bost receives on average 792 mm of precipitation per year, spread over about 150 rainy days.
Is it sunny in Bost?
Bost gets on average 7.4 hours of sunshine per day, roughly 2,701 hours per year over 1940-2025.
What is the biggest single-day snowfall in Bost?
The heaviest 24-hour snowfall measured in Bost between 1940 and 2025 was 15 February 1987, with 11.3 cm.
Are there tropical nights in Bost?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Bost.
What was the most extreme apparent temperature in Bost?
In Bost, between 1940 and 2025, the highest apparent temperature reached 41.0 °C on 25 July 2019, and the lowest was -27.9 °C on 27 January 1942.
These forecasts and records come from our own weather API. Developer documentation →
Compare Bost with another city
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Nearby cities
The climate around Bost