Mean temperature change 

Updated: 1.9.2017 - Next update: 1.12.2017

It was unusually cold occasionally during the summer

Summer (June-August) was unusually cold in southern and central parts of the country, where the anomaly was over 1 degree Celsius. In the north the anomaly was about 0,5 degrees. The cool temperatures were partly a result of increased cloud cover. Sunshine hours were unusually low, especially in the north.

The daily highs were on average the sixth coldest since the 1960s, which is fairly rare. In addition, the nation’s highest temperature was 27,6 degrees Celsius on July 28th in Utsjoki. The last time the highest temperature was this low was in 1976.

There were in total 19 hot days, where the temperature was over 25 degrees Celsius somewhere in Finland. The last time there were as many hot days was in 2015. Locally, the most hot days was recorded in Oulu and Mikkeli, in total 5. In many parts of Central-Finland there were no hot days this summer.

Finnish Meteorological Institute

Description of indicator

Following the evolution of mean temperatures gives information on the progress of climate change. There are many factors that affect the temperatures. Annual and decadal temperature oscillations are related to changes in different weather types. Occasionally we get mild weather from southerly and westerly flows and occasionally colder weather from the north.

Finnish temperatures have risen approximately one degree Celsius since early 20th century. In Helsinki the urban heat island effect amplifies the warming trend. The temperature rise is not constant and it is partly obscured by the large natural variability which is characteristic for Finland. Globally however the temperature rise of over half a degree Celsius in the 20th century is statistically significant.