Sommethonne climate — normals and trends
Sommethonne has a temperate oceanic climate, averaging 9.4 °C annually with 886 mm of rain per year.
Climate normals · ERA5
SommethonneWallonia
- coords
- 49.58°, 5.45°
- 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
9.4°C
Average daily high
12.9°C
Average daily low
5.9°C
Annual rainfall
886mm
Sunshine / day
7.6h
Mean relative humidity
80%
Average peak wind
18.9km/h
Seasonal range
16.5°C
Frost days (< 0 °C)
65 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
150 d/yr
Annual snowfall
36.7 cm
Average feels-like high
10.4 °C
Average feels-like low
2.9 °C
Average peak gust
37.2 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
11.2 MJ/m²
Has the climate changed?
What the yearly averages say about warming here, and whether the slope is statistically solid.
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.39 · 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
39.2 °C
25 July 2019
Coldest day
-18.0 °C
22 January 1940
Wettest day
56 mm
11 May 1970
Windiest day
56.5 km/h
3 February 1990
Strongest gust
123.5 km/h
24 November 1984
Hottest feels-like
39.6 °C
26 June 2026
Coldest feels-like
-25.1 °C
6 January 1947
Snowiest day
12.0 cm
7 January 1968
Sunniest day
15.4 h
29 June 2019
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 | 5.3 °C | +2.0 °C | 141 mm | +56 mm |
| Feb | 6.0 °C | +1.1 °C | 46 mm | -26 mm |
| Mar | 13.0 °C | +4.0 °C | 16 mm | -55 mm |
| Apr | 16.7 °C | +3.9 °C | 54 mm | -10 mm |
| May | 19.2 °C | +2.4 °C | 40 mm | -35 mm |
| Jun | 24.7 °C | +4.7 °C | 68 mm | -3 mm |
| Jul | 23.6 °C | +1.6 °C | 104 mm | +39 mm |
| Aug | 24.8 °C | +3.1 °C | 47 mm | -22 mm |
| Sep | 18.6 °C | +0.3 °C | 146 mm | +79 mm |
| Oct | 13.8 °C | +0.5 °C | 104 mm | +31 mm |
| Nov | 9.4 °C | +2.0 °C | 70 mm | -13 mm |
| Dec | 7.3 °C | +3.0 °C | 43 mm | -48 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.
Sommethonne (Belgium) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.4 °C and it receives 886 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 (1.2 °C). Rainfall peaks in December.
Sommethonne averages 65 frost days, 3 hot days (≥ 30 °C) and 150 rainy days per year.
Sommethonne has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 80 to 50 per year over the period.
The hottest day of the period reached 39.2 °C (on 25 July 2019) and the coldest -18.0 °C (on 22 January 1940).
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 Sommethonne?
Sommethonne has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.4 °C and it receives 886 mm of precipitation per year.
What is the hottest day ever recorded in Sommethonne?
The hottest day measured in Sommethonne between 1940 and 2025 was 25 July 2019, reaching 39.2 °C.
What is the coldest day in Sommethonne?
The coldest day measured in Sommethonne between 1940 and 2025 was 22 January 1940, at -18.0 °C.
Does it snow in Sommethonne?
Yes. Sommethonne gets on average 36.7 cm of snow per year and has around 65 frost days.
Has the climate of Sommethonne warmed?
Yes: Sommethonne warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sommethonne?
The wettest day measured in Sommethonne between 1940 and 2025 was 11 May 1970, with 56 mm of rain in 24 hours.
What was the windiest day in Sommethonne?
The windiest day measured in Sommethonne between 1940 and 2025 was 3 February 1990, with winds reaching 56.5 km/h.
What is the warmest month in Sommethonne?
The warmest month in Sommethonne is July (17.7 °C on average); the coldest is January (1.2 °C).
How much does it rain in Sommethonne?
Sommethonne receives on average 886 mm of precipitation per year, spread over about 150 rainy days.
Is it sunny in Sommethonne?
Sommethonne 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 Sommethonne?
The heaviest 24-hour snowfall measured in Sommethonne between 1940 and 2025 was 7 January 1968, with 12.0 cm.
Are there tropical nights in Sommethonne?
Yes: Sommethonne has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sommethonne?
In Sommethonne, between 1940 and 2025, the highest apparent temperature reached 39.6 °C on 26 June 2026, and the lowest was -25.1 °C on 6 January 1947.
These forecasts and records come from our own weather API. Developer documentation →
Compare Sommethonne with another city
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Nearby cities
The climate around Sommethonne