Last year was the second-warmest ever recorded in Finland, according to preliminary data published on Friday by the Finnish Meteorological Institute (FMI).

The nationwide average temperature for 2025 was 4.5 degrees Celsius, which is 1.6 degrees higher than the long-term average for the years 1991–2020.

The warmest year on record is 2020, when the nationwide average temperature stood at 4.8 degrees.

Annual average temperatures last year ranged from about +8 degrees in the southwestern archipelago to around zero degrees in northwestern Lapland.

On average, temperatures in 2025 were 1-2 degrees higher than normal in most parts of the country.

Most of Finland's weather measurement stations recorded their second-highest ever average temperature, just below the records set in 2020.

The highest temperature of last year was 32.6 degrees, registered in Oulu in July, while the lowest temperature of 2025 was -39.6 degrees, recorded in Savukoski in February.

Finland saw an unprecedented heatwave during the summer of 2025, with at least one weather station in the country recording temperatures above 30 degrees Celsius for 22 consecutive days — from 12 July to 2 August. The previous record was set in 1972, when the mercury climbed above 30 degrees on 13 consecutive days.

Last January, the FMI issued a warning that the climate in the Nordic region is warming considerably faster than the rest of the world.