Bordeaux or Vienna: which climate?
Bordeaux (France) has a temperate oceanic climate, whereas Vienna (Austria) 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 Bordeaux and to Vienna.
Bordeaux is warmer than Vienna by 3.5 °C in annual average: 13.4 °C against 9.9 °C.
Bordeaux gets more rain than Vienna: 778 mm per year against 639 mm.
Bordeaux gets 9.1 hours of sunshine per day on average, against 8.3 hours in Vienna.
Vienna has warmed by +2.4 °C between 1940 and 2025, against +1.7 °C in Bordeaux. Vienna is therefore warming faster than Bordeaux. Both trends are statistically significant.
Bordeaux averages 19 hot days (≥ 30 °C) and 26 frost days per year; Vienna averages 12 and 83.
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 | Bordeaux | Vienna | Difference |
|---|---|---|---|
| Mean daily temperature | 13.4 °C | 9.9 °C | -3.5 °C |
| Average daily high | 18.0 °C | 14.0 °C | -4.0 °C |
| Average daily low | 9.2 °C | 6.1 °C | -3.1 °C |
| Annual rainfall | 778 mm | 639 mm | -139 mm |
| Sunshine / day | 9.1 h | 8.3 h | -0.8 h |
| Hot days (≥ 30 °C) | 19 d/yr | 12 d/yr | -7 d/yr |
| Frost days (< 0 °C) | 26 d/yr | 83 d/yr | +57 d/yr |
| Rainy days (≥ 1 mm) | 126 d/yr | 118 d/yr | -8 d/yr |
| Mean relative humidity | 76 % | 74 % | negligible |
| Average peak wind | 14.9 km/h | 18.3 km/h | +3.4 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.