Dublin or Lisbon: which climate?
Dublin (Ireland) has a temperate oceanic climate, whereas Lisbon (Portugal) has a warm-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 Dublin and to Lisbon.
Lisbon is warmer than Dublin by 6.5 °C in annual average: 16.0 °C against 9.5 °C.
Dublin gets more rain than Lisbon: 829 mm per year against 586 mm.
Lisbon gets 10.5 hours of sunshine per day on average, against 7.8 hours in Dublin.
Dublin and Lisbon are warming at the same rate: about +0.8 °C between 1940 and 2025 on both sides.
Dublin averages 0 hot days (≥ 30 °C) and 17 frost days per year; Lisbon averages 2 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 | Dublin | Lisbon | Difference |
|---|---|---|---|
| Mean daily temperature | 9.5 °C | 16.0 °C | +6.5 °C |
| Average daily high | 12.1 °C | 18.6 °C | +6.5 °C |
| Average daily low | 7.0 °C | 13.7 °C | +6.7 °C |
| Annual rainfall | 829 mm | 586 mm | -243 mm |
| Sunshine / day | 7.8 h | 10.5 h | +2.7 h |
| Hot days (≥ 30 °C) | 0 d/yr | 2 d/yr | negligible |
| Frost days (< 0 °C) | 17 d/yr | 0 d/yr | -17 d/yr |
| Rainy days (≥ 1 mm) | 159 d/yr | 82 d/yr | -77 d/yr |
| Mean relative humidity | 83 % | 78 % | -5 % |
| Average peak wind | 22.5 km/h | 23.3 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.