Finland is experiencing warm and sunny weather with temperatures ranging between 20 and 25 degrees Celsius, and an advisory for strong ultraviolet radiation has been issued for the south and southwest.
A high of 14.7 degrees Celsius was measured in the southwestern city of Pori on Monday night.
According to Simo Laine, head horticulturalist at botanical garden in Turku, southwest Finland, it could well be the first time that the blooms have made an appearance in the country as early as January.
More than 40,000 households faced blackouts overnight.
A close cousin to the tornado - the waterspout - touched down in south-western Finland on Friday.
Record wind speeds have been clocked in southern maritime districts as a storm dubbed Aapeli causes widespread power cuts and train delays across Finland.
Packed ice crystals have pushed up water levels on the Kokemäki River, soaking some buildings in Huittinen and Pori.
As many people resident in Finland already know, May was an exceptionally cold month. According to the Finnish Meteorological Institute FMI, the last time May daytime temperatures were this low was in 1969.
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