Rio de Janeiro or Vienna: which climate?
Rio de Janeiro (Brazil) has a tropical monsoon 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 Rio de Janeiro and to Vienna.
Rio de Janeiro is warmer than Vienna by 13.5 °C in annual average: 23.4 °C against 9.9 °C.
Rio de Janeiro gets more rain than Vienna: 1,270 mm per year against 639 mm.
Rio de Janeiro gets 9.6 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 +1.5 °C in Rio de Janeiro. Vienna is therefore warming faster than Rio de Janeiro. Both trends are statistically significant.
Rio de Janeiro averages 57 hot days (≥ 30 °C) and 0 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 | Rio de Janeiro | Vienna | Difference |
|---|---|---|---|
| Mean daily temperature | 23.4 °C | 9.9 °C | -13.5 °C |
| Average daily high | 26.5 °C | 14.0 °C | -12.5 °C |
| Average daily low | 20.9 °C | 6.1 °C | -14.8 °C |
| Annual rainfall | 1,270 mm | 639 mm | -631 mm |
| Sunshine / day | 9.6 h | 8.3 h | -1.3 h |
| Hot days (≥ 30 °C) | 57 d/yr | 12 d/yr | -45 d/yr |
| Frost days (< 0 °C) | 0 d/yr | 83 d/yr | +83 d/yr |
| Rainy days (≥ 1 mm) | 157 d/yr | 118 d/yr | -39 d/yr |
| Mean relative humidity | 81 % | 74 % | -7 % |
| Average peak wind | 16.9 km/h | 18.3 km/h | negligible |
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.