Weather in Finland
The mean temperature remains below 0 degrees of Celcius during the winter. Warm air flows may raise the daily temperature above 0 C at times.
Winter in Lapland
Winter starts around mid-October and it lasts 200 days. Polar night is a period when the sun does not rise at all. It lasts 51 days in Nuorgam, which is the most northern place in Finland.
There's permanent snow on the ground usually within two weeks from the start of the winter. The deepest snow coverage is 60 - 90 cm in mid-March. Average temperature is around -12 degrees of Celcius.
Winter in Southern Finland
Winter starts in December and it lasts around 100 days. There's 20 - 30 cm snow coverage during the mid-winter. Lakes get frozen and the ice is thickest in early April. Average temperature is around -5 degrees of Celcius.
The mean daily temperature raises from 0 to 10 during spring. Snow starts to melt away.
Spring in Lapland
The most northern Lapland gets spring in May. Spring lasts around 45 days. Average temperature is around 0 degrees of Celcius in April
Spring in Southern Finland
Spring starts in April. The longest spring lasts 65 days in the coastal regions due to the coldness of the sea. Average temperature is around 3 degrees of Celcius in April.
Daily temperature is consistently above 10 degrees of Celcius. The warmest days of the year are typically in late July.
Summer in Lapland
Lapland has a really short summer period. It starts in June and ends in mid-August. The regions north from the Arctic Circle have polar days when the sun does not set at all. Nuorgam has 73 polar days. Average temperature is around 14 degrees of Celcius in July.
Summer in Southern Finland
Summer begins in late May and lasts until mid-September. Average temperature is around 18 degrees of Celcius in late July.
Daily temperatures remain below 10 degrees of Celcius. The growing season ends when daily temperatures drop below 5 degrees of Celcius.
Autumn in Lapland
Autumn begins in late August. Average temperature is around 5 degrees of Celcius in October.
Autumn in Southern Finland
Autumn begins in late October. The first snow falls in October, but it does not create a permanent snow blanket. Average temperature is around 0 degrees of Celcius in October.