Solothurn climate — normals and trends
Solothurn (Switzerland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.7 °C and it receives 1,304 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 (17.8 °C on average) and the coldest is January (-0.6 °C). Rainfall peaks in August.
Solothurn averages 92 frost days, 3 hot days (≥ 30 °C) and 181 rainy days per year.
Solothurn has warmed by +2.5 °C between 1940 and 2025, or +0.29 °C per decade. This trend is statistically significant.
The number of frost days there went from about 116 to 68 per year over the period.
The hottest day of the period reached 35.0 °C (on 7 July 2015) and the coldest -26.3 °C (on 13 February 1956).
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
SolothurnCanton of Solothurn
- coords
- 47.21°, 7.54°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.7°C
Average daily high
12.7°C
Average daily low
4.9°C
Annual rainfall
1,304mm
Sunshine / day
8.3h
Mean relative humidity
79%
Average peak wind
11.2km/h
Seasonal range
18.4°C
Frost days (< 0 °C)
92 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
181 d/yr
Annual snowfall
102.2 cm
Average feels-like high
11.0 °C
Average feels-like low
2.8 °C
Average peak gust
31.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.59 · 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
35.0 °C
7 July 2015
Coldest day
-26.3 °C
13 February 1956
Wettest day
60 mm
27 September 1942
Windiest day
46.4 km/h
26 December 1999
Strongest gust
133.2 km/h
26 December 1999
Hottest feels-like
38.0 °C
26 June 2019
Coldest feels-like
-30.8 °C
13 February 1956
Snowiest day
29.0 cm
4 March 2006
Sunniest day
15.0 h
19 May 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 | 4.9 °C | +2.5 °C | 121 mm | +37 mm |
| Feb | 5.9 °C | +1.3 °C | 61 mm | -18 mm |
| Mar | 11.5 °C | +2.5 °C | 61 mm | -28 mm |
| Apr | 15.9 °C | +3.0 °C | 93 mm | -14 mm |
| May | 18.0 °C | +1.0 °C | 130 mm | -11 mm |
| Jun | 25.5 °C | +5.1 °C | 138 mm | -2 mm |
| Jul | 23.0 °C | +0.4 °C | 151 mm | +15 mm |
| Aug | 24.9 °C | +2.9 °C | 199 mm | +55 mm |
| Sep | 18.6 °C | +0.1 °C | 169 mm | +63 mm |
| Oct | 13.2 °C | -0.1 °C | 131 mm | +40 mm |
| Nov | 8.1 °C | +1.2 °C | 131 mm | +35 mm |
| Dec | 4.9 °C | +1.7 °C | 23 mm | -68 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 Solothurn?
Solothurn has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.7 °C and it receives 1,304 mm of precipitation per year.
What is the hottest day ever recorded in Solothurn?
The hottest day measured in Solothurn between 1940 and 2025 was 7 July 2015, reaching 35.0 °C.
What is the coldest day in Solothurn?
The coldest day measured in Solothurn between 1940 and 2025 was 13 February 1956, at -26.3 °C.
Does it snow in Solothurn?
Yes. Solothurn gets on average 102.2 cm of snow per year and has around 92 frost days.
Has the climate of Solothurn warmed?
Yes: Solothurn warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Solothurn?
The wettest day measured in Solothurn between 1940 and 2025 was 27 September 1942, with 60 mm of rain in 24 hours.
What was the windiest day in Solothurn?
The windiest day measured in Solothurn between 1940 and 2025 was 26 December 1999, with winds reaching 46.4 km/h.
What is the warmest month in Solothurn?
The warmest month in Solothurn is July (17.8 °C on average); the coldest is January (-0.6 °C).
How much does it rain in Solothurn?
Solothurn receives on average 1,304 mm of precipitation per year, spread over about 181 rainy days.
Is it sunny in Solothurn?
Solothurn 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 Solothurn?
The heaviest 24-hour snowfall measured in Solothurn between 1940 and 2025 was 4 March 2006, with 29.0 cm.
Are there tropical nights in Solothurn?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Solothurn.
What was the most extreme apparent temperature in Solothurn?
In Solothurn, between 1940 and 2025, the highest apparent temperature reached 38.0 °C on 26 June 2019, and the lowest was -30.8 °C on 13 February 1956.
Compare Solothurn with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Solothurn