Geneva or Oslo: which climate?
Geneva (Switzerland) has a warm-summer humid continental climate, whereas Oslo (Norway) has a warm-summer humid continental climate, according to the Köppen-Geiger classification.
The values compared here are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme. The same method and the same period apply to Geneva and to Oslo.
Geneva is warmer than Oslo by 3.6 °C in annual average: 8.6 °C against 5.0 °C.
Geneva gets more rain than Oslo: 1,405 mm per year against 940 mm.
Geneva gets 8.9 hours of sunshine per day on average, against 7.5 hours in Oslo.
Geneva and Oslo are warming at the same rate: about +3.0 °C between 1940 and 2025 on both sides.
Geneva averages 2 hot days (≥ 30 °C) and 100 frost days per year; Oslo averages 0 and 148.
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
| Indicator | Geneva | Oslo | Difference |
|---|---|---|---|
| Mean daily temperature | 8.6 °C | 5.0 °C | -3.6 °C |
| Average daily high | 12.9 °C | 8.3 °C | -4.6 °C |
| Average daily low | 4.5 °C | 1.5 °C | -3.0 °C |
| Annual rainfall | 1,405 mm | 940 mm | -465 mm |
| Sunshine / day | 8.9 h | 7.5 h | -1.4 h |
| Hot days (≥ 30 °C) | 2 d/yr | 0 d/yr | negligible |
| Frost days (< 0 °C) | 100 d/yr | 148 d/yr | +48 d/yr |
| Rainy days (≥ 1 mm) | 161 d/yr | 133 d/yr | -28 d/yr |
| Mean relative humidity | 78 % | 79 % | negligible |
| Average peak wind | 9.6 km/h | 13.7 km/h | +4.1 km/h |
A difference is only reported when it exceeds the resolution of the data. ERA5 is a reanalysis on a grid of about 31 km: two nearby cities often fall in the same cell, and below half a degree you are reading the grid, not the climate.