Latitude is the principal influence on Finland's
Because of Finland's northern location, winter is the
season. On the average, winter lasts 105 to 120 days in
archipelago and 180 to 220 days in Lapland. This means
southern portions of the country are snow-covered about
months of the year and the northern, about seven months.
winter causes about half of the annual 500 to 600
precipitation in the north to fall as snow. Precipitation
south amounts to about 600 to 700 millimeters annually.
of the north, it occurs all through the year, though not
of it is snow.
The Atlantic Ocean to the west and the Eurasian
the east interact to modify the climate of the country.
waters of the Gulf Stream and the North Atlantic Drift
which warm Norway and Sweden, also warm Finland. Westerly
bring the warm air currents into the Baltic areas and to
country's shores, moderating winter temperatures,
the south. These winds, because of clouds associated with
systems accompanying the westerlies, also decrease the
sunshine received during the summer. By contrast, the
high pressure system situated over the Eurasian continent
counteracts the maritime influences, causing severe
occasionally high temperatures in the summer.
Data as of December 1988