London or Montreal: which climate?
London (United Kingdom) has a temperate oceanic climate, whereas Montreal (Canada) 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 London and to Montreal.
London is warmer than Montreal by 3.5 °C in annual average: 10.2 °C against 6.7 °C.
Montreal gets more rain than London: 1,081 mm per year against 615 mm.
Montreal gets 8.5 hours of sunshine per day on average, against 7.5 hours in London.
London and Montreal are warming at the same rate: about +1.8 °C between 1940 and 2025 on both sides.
London averages 1 hot days (≥ 30 °C) and 36 frost days per year; Montreal averages 9 and 146.
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 | London | Montreal | Difference |
|---|---|---|---|
| Mean daily temperature | 10.2 °C | 6.7 °C | -3.5 °C |
| Average daily high | 13.4 °C | 11.2 °C | -2.2 °C |
| Average daily low | 6.9 °C | 2.1 °C | -4.8 °C |
| Annual rainfall | 615 mm | 1,081 mm | +466 mm |
| Sunshine / day | 7.5 h | 8.5 h | +1.0 h |
| Hot days (≥ 30 °C) | 1 d/yr | 9 d/yr | +8 d/yr |
| Frost days (< 0 °C) | 36 d/yr | 146 d/yr | +110 d/yr |
| Rainy days (≥ 1 mm) | 123 d/yr | 138 d/yr | +15 d/yr |
| Mean relative humidity | 80 % | 72 % | -8 % |
| Average peak wind | 20.4 km/h | 18.7 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.