Miami or Vienna: which climate?
Miami (United States) has a tropical savanna 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 Miami and to Vienna.
Miami is warmer than Vienna by 14.5 °C in annual average: 24.4 °C against 9.9 °C.
Miami gets more rain than Vienna: 1,041 mm per year against 639 mm.
Miami gets 10.6 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 +1.0 °C in Miami. Vienna is therefore warming faster than Miami. Both trends are statistically significant.
Miami averages 45 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 | Miami | Vienna | Difference |
|---|---|---|---|
| Mean daily temperature | 24.4 °C | 9.9 °C | -14.5 °C |
| Average daily high | 26.7 °C | 14.0 °C | -12.7 °C |
| Average daily low | 22.3 °C | 6.1 °C | -16.2 °C |
| Annual rainfall | 1,041 mm | 639 mm | -402 mm |
| Sunshine / day | 10.6 h | 8.3 h | -2.3 h |
| Hot days (≥ 30 °C) | 45 d/yr | 12 d/yr | -33 d/yr |
| Frost days (< 0 °C) | 0 d/yr | 83 d/yr | +83 d/yr |
| Rainy days (≥ 1 mm) | 162 d/yr | 118 d/yr | -44 d/yr |
| Mean relative humidity | 75 % | 74 % | negligible |
| Average peak wind | 21.3 km/h | 18.3 km/h | -3.0 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.