The mean temperature of 2009 was 3...7 degrees in southern and central portions of the country and -1...+3 degrees in northern parts. The year was roughly 0,5...1,5 degrees warmer than average.
Although February had some cold days, the warm January turned winter of 2008-2009 milder than average. Dispite of this there were an average number of "winter days" in the country (daily mean temperature below zero). The lowest recorded temperature was -37,6°C at Inari Sevettijärvi on February 7th.
Spring was warmer and locally drier than average. The precipitation between March and May was roughly half of normal values in eastern Finland. On the other hand western Finland and Lapland received normal amounts of rain.
Summer began cooler than normal and in the beginning of June the weather was exceptionally cold in southern and central parts of the country. There was a brief warm period at the end of June, but early July the coldness came back and temperatures below zero were recorded at night. In the end summer turned out to be slightly warmer than average thanks to a warm August. The highest temperature was 29,6°C in Jämsä on 28th of June.
Autumn began with rare warmth in September, but October on the other hand was colder than average. November was mild and so autumn was warmer than average in the whole country. December was cold and so the winter season of 2009-2010 started with below average temperatures everywhere except Lapland.
The annual precipitation was slightly less than average in the whole country. Approximately 500-650 mm of precipitation was recorded, but in parts of central and western Finland and northern Lapland the amount was 400-500 mm. Central and southwestern parts of Finland had the least amount of precipitation when compared to long-term averages.
There were fewer storms in 2009 than on average. Storms with 10-minute wind speeds of at least 21 m/s occurred only on 11 days with average being 23. The last time the storm count was this small was in 2002.
The sun shone approximately 1500-2000 hours in most parts of the country. The sunshine duration was therefore close to long-term averages.