Hamburg or Oslo: which climate?
Hamburg (Germany) has a temperate oceanic 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 Hamburg and to Oslo.
Hamburg is warmer than Oslo by 4.0 °C in annual average: 9.0 °C against 5.0 °C.
Oslo gets more rain than Hamburg: 940 mm per year against 733 mm.
Oslo has warmed by +2.8 °C between 1940 and 2025, against +2.2 °C in Hamburg. Oslo is therefore warming faster than Hamburg. Both trends are statistically significant.
Hamburg averages 3 hot days (≥ 30 °C) and 67 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 | Hamburg | Oslo | Difference |
|---|---|---|---|
| Mean daily temperature | 9.0 °C | 5.0 °C | -4.0 °C |
| Average daily high | 12.4 °C | 8.3 °C | -4.1 °C |
| Average daily low | 5.8 °C | 1.5 °C | -4.3 °C |
| Annual rainfall | 733 mm | 940 mm | +207 mm |
| Sunshine / day | 7.2 h | 7.5 h | negligible |
| Hot days (≥ 30 °C) | 3 d/yr | 0 d/yr | negligible |
| Frost days (< 0 °C) | 67 d/yr | 148 d/yr | +81 d/yr |
| Rainy days (≥ 1 mm) | 144 d/yr | 133 d/yr | -11 d/yr |
| Mean relative humidity | 80 % | 79 % | negligible |
| Average peak wind | 18.6 km/h | 13.7 km/h | -4.9 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.