Buenos Aires or Naples: which climate?
Buenos Aires (Argentina) has a humid subtropical climate, whereas Naples (Italy) has a hot-summer mediterranean 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 Buenos Aires and to Naples.
Buenos Aires and Naples have the same mean annual temperature, about 17.2 °C: the gap between the two cities is too small to be told apart from the noise in the data.
Naples gets more rain than Buenos Aires: 1,099 mm per year against 992 mm.
Naples gets 10.2 hours of sunshine per day on average, against 9.6 hours in Buenos Aires.
Naples has warmed by +1.4 °C between 1940 and 2025, against +0.6 °C in Buenos Aires. Naples is therefore warming faster than Buenos Aires. Both trends are statistically significant.
Buenos Aires averages 11 hot days (≥ 30 °C) and 0 frost days per year; Naples averages 0 and 0.
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 | Buenos Aires | Naples | Difference |
|---|---|---|---|
| Mean daily temperature | 17.2 °C | 16.9 °C | negligible |
| Average daily high | 20.4 °C | 18.2 °C | -2.2 °C |
| Average daily low | 14.2 °C | 15.6 °C | +1.4 °C |
| Annual rainfall | 992 mm | 1,099 mm | +107 mm |
| Sunshine / day | 9.6 h | 10.2 h | +0.6 h |
| Hot days (≥ 30 °C) | 11 d/yr | 0 d/yr | -11 d/yr |
| Frost days (< 0 °C) | 0 d/yr | 0 d/yr | negligible |
| Rainy days (≥ 1 mm) | 93 d/yr | 108 d/yr | +15 d/yr |
| Mean relative humidity | 75 % | 76 % | negligible |
| Average peak wind | 22.6 km/h | 21.5 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.