The current freezing temperatures of -10 degrees Celsius will drop with the arrival of a cold front from the east that will push the mercury down to -15 degrees Celsius on Monday in western Finland and -20 degrees Celsius in central and northern Finland.
In southern Finland on Wednesday and Thursday it may drop to -20 degrees Celsius, with -30 degrees Celsius in store for further up north.
Temperatures below -40 degrees Celsius are extremely rare in Finland, and have only been recorded five times according to official readings.
The coldest temperatures on record for Finland are:
-51.5 Kittilä (January 1, 1999)
-49 Sodankylä (February 5, 1912)
-47 Pielisjärvi (December 21, 1919)
-44.3 Salla (March 1, 1971)
-42 Sodankylä (November 30, 1815)
Heavy snowfall during the beginning of the week will create difficult driving conditions in many parts of the country.