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Solothurn, Switzerland climate
Cfb Oceanic / temperate
Solothurn has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 25°C, while the coldest is January averaging around −3°C at night. Around 1026 mm of precipitation falls each year, peaking in August (115 mm) and easing off in February (57 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Solothurn climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 3 | 5 | 11 | 15 | 19 | 23 | 25 | 25 | 20 | 14 | 8 | 4 |
| Avg temp (°C) | 0 | 1 | 5 | 9 | 13 | 17 | 19 | 18 | 14 | 10 | 4 | 1 |
| Avg low (°C) | −3 | −3 | 0 | 3 | 8 | 11 | 13 | 13 | 9 | 6 | 1 | −2 |
| Precipitation (mm) | 65 | 57 | 63 | 75 | 105 | 107 | 107 | 115 | 85 | 85 | 77 | 85 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 3 | 5 | 11 | 15 | 19 | 23 |
| Avg temp (°C) | 0 | 1 | 5 | 9 | 13 | 17 |
| Avg low (°C) | −3 | −3 | 0 | 3 | 8 | 11 |
| Precipitation (mm) | 65 | 57 | 63 | 75 | 105 | 107 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 25 | 25 | 20 | 14 | 8 | 4 |
| Avg temp (°C) | 19 | 18 | 14 | 10 | 4 | 1 |
| Avg low (°C) | 13 | 13 | 9 | 6 | 1 | −2 |
| Precipitation (mm) | 107 | 115 | 85 | 85 | 77 | 85 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 70 | 68 | 69 | 70 | 66 | 61 | 60 | 62 | 70 | 75 | 74 |
| Relative humidity (%) | 84 | 83 | 80 | 78 | 78 | 77 | 76 | 75 | 78 | 82 | 85 | 84 |
| Wind speed (km/h) | 6.9 | 7.3 | 7.6 | 6.8 | 6.7 | 6.4 | 6.0 | 5.6 | 5.9 | 5.9 | 5.8 | 6.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 70 | 68 | 69 | 70 | 66 |
| Relative humidity (%) | 84 | 83 | 80 | 78 | 78 | 77 |
| Wind speed (km/h) | 6.9 | 7.3 | 7.6 | 6.8 | 6.7 | 6.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 60 | 62 | 70 | 75 | 74 |
| Relative humidity (%) | 76 | 75 | 78 | 82 | 85 | 84 |
| Wind speed (km/h) | 6.0 | 5.6 | 5.9 | 5.9 | 5.8 | 6.8 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from a national meteorological service, measured at Koppigen, about 11 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.