Geneva or New York: which climate?
Geneva (Switzerland) has a warm-summer humid continental climate, whereas New York (United States) has a hot-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 Geneva and to New York.
New York is warmer than Geneva by 3.5 °C in annual average: 12.1 °C against 8.6 °C.
Geneva gets more rain than New York: 1,405 mm per year against 1,098 mm.
Geneva has warmed by +3.0 °C between 1940 and 2025, against +1.7 °C in New York. Geneva is therefore warming faster than New York. Both trends are statistically significant.
Geneva averages 2 hot days (≥ 30 °C) and 100 frost days per year; New York averages 20 and 75.
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 | Geneva | New York | Difference |
|---|---|---|---|
| Mean daily temperature | 8.6 °C | 12.1 °C | +3.5 °C |
| Average daily high | 12.9 °C | 15.7 °C | +2.8 °C |
| Average daily low | 4.5 °C | 8.6 °C | +4.1 °C |
| Annual rainfall | 1,405 mm | 1,098 mm | -307 mm |
| Sunshine / day | 8.9 h | 8.8 h | negligible |
| Hot days (≥ 30 °C) | 2 d/yr | 20 d/yr | +18 d/yr |
| Frost days (< 0 °C) | 100 d/yr | 75 d/yr | -25 d/yr |
| Rainy days (≥ 1 mm) | 161 d/yr | 118 d/yr | -43 d/yr |
| Mean relative humidity | 78 % | 71 % | -7 % |
| Average peak wind | 9.6 km/h | 17.4 km/h | +7.8 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.