Mean temperature change
|Updated: 2.12.2013 - Next update: 3.3.2014|
Autumn was warmer than average
Autumn was warmer than the 1981-2010 long term average in the whole country. The mean temperature for the autumn months (September-November) was highest in the southwestern parts of Finland, approximately 8 °C. Northwestern Lapland was the coldest with a mean temperature slightly below 0 °C. During this century, the years 2000, 2005, 2006 and 2011 had warmer autumns.
Thermal autumn started in the whole country around September 20th, which in Lapland is approximately a month later than on average. In southern parts of the country thermal autumn started around the usual time. Thermal winter began in Lapland around mid-October, which is fairly typical. In central parts of Finland thermal winter began in late-November, which is later than usual.
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.