Mean temperature change

Updated: 2 Dec 2019
Next update: 2 Mar 2020

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.


Colder than usual in Lapland

Autumn (September-November) was approximately one degree Celsius colder than usual in Lapland. Elsewhere in the country autumn was near average.
The last time Lapland experienced such cold autumn was in 2002.

The highest temperature this autumn was 26,2 degrees on September 10th at Lappeenranta Konnunsuo. It was also the last hot day
(maximum temperature over 25 degrees) in the country. This was also the second latest hot day ever measured in Finland. The latest was measured
on September 17th 1947 at Tampere and Seinäjoki. Temperature then was 25,2 degrees.

The lowest temperature this autumn was -30,9 degrees, which was measured on November 11th at Enontekiö and Utsjoki.