Tokyo or Vienna: which climate?
Tokyo (Japan) has a humid subtropical 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 Tokyo and to Vienna.
Tokyo is warmer than Vienna by 5.4 °C in annual average: 15.3 °C against 9.9 °C.
Tokyo gets more rain than Vienna: 1,376 mm per year against 639 mm.
Tokyo and Vienna are warming at the same rate: about +2.2 °C between 1940 and 2025 on both sides.
Tokyo averages 36 hot days (≥ 30 °C) and 34 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 | Tokyo | Vienna | Difference |
|---|---|---|---|
| Mean daily temperature | 15.3 °C | 9.9 °C | -5.4 °C |
| Average daily high | 19.1 °C | 14.0 °C | -5.1 °C |
| Average daily low | 12.0 °C | 6.1 °C | -5.9 °C |
| Annual rainfall | 1,376 mm | 639 mm | -737 mm |
| Sunshine / day | 8.2 h | 8.3 h | negligible |
| Hot days (≥ 30 °C) | 36 d/yr | 12 d/yr | -24 d/yr |
| Frost days (< 0 °C) | 34 d/yr | 83 d/yr | +49 d/yr |
| Rainy days (≥ 1 mm) | 134 d/yr | 118 d/yr | -16 d/yr |
| Mean relative humidity | 74 % | 74 % | negligible |
| Average peak wind | 19.9 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.