Marseille or Rome: which climate?
Marseille (France) has a hot-summer mediterranean climate, whereas Rome (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 Marseille and to Rome.
Marseille and Rome have the same mean annual temperature, about 14.8 °C: the gap between the two cities is too small to be told apart from the noise in the data.
Rome gets more rain than Marseille: 860 mm per year against 657 mm.
Marseille gets 10.4 hours of sunshine per day on average, against 10.0 hours in Rome.
Marseille and Rome are warming at the same rate: about +1.8 °C between 1940 and 2025 on both sides.
Marseille averages 1 hot days (≥ 30 °C) and 3 frost days per year; Rome averages 43 and 17.
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 | Marseille | Rome | Difference |
|---|---|---|---|
| Mean daily temperature | 14.8 °C | 15.2 °C | negligible |
| Average daily high | 17.3 °C | 20.1 °C | +2.8 °C |
| Average daily low | 12.5 °C | 10.7 °C | -1.8 °C |
| Annual rainfall | 657 mm | 860 mm | +203 mm |
| Sunshine / day | 10.4 h | 10.0 h | -0.4 h |
| Hot days (≥ 30 °C) | 1 d/yr | 43 d/yr | +42 d/yr |
| Frost days (< 0 °C) | 3 d/yr | 17 d/yr | +14 d/yr |
| Rainy days (≥ 1 mm) | 78 d/yr | 107 d/yr | +29 d/yr |
| Mean relative humidity | 74 % | 74 % | negligible |
| Average peak wind | 25.5 km/h | 13.8 km/h | -11.7 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.