Winter has begun to assert itself across Finland, with temperatures dropping sharply and snowfall spreading from north to south over the weekend. The sudden shift follows an unusually mild October and early November, marking a dramatic start to the winter season.
In Lapland, temperatures fell to around –20°C on Saturday night, signalling the arrival of a harsher-than-average cold period. North Ostrobothnia and Kainuu recorded around 10 centimetres of snowfall, while lighter snow showers dusted parts of southern and central Finland.
The Finnish Meteorological Institute (FMI) has issued a traffic weather warning for Sunday across North Savo, North Karelia, Kainuu and western North Ostrobothnia.
The combination of snow and sleet is expected to create hazardous road conditions, reducing visibility and increasing the likelihood of accidents.
Meteorologists say the abrupt onset of winter may be more than just a brief cold snap.
According to the FMI, several atmospheric indicators point to a colder-than-normal period that could last for weeks or potentially even months.
A key factor behind Finland’s early deep freeze may be the behaviour of the polar vortex — a large area of cold, low-pressure air that forms over the Arctic during winter.
Yle meteorologist Matti Huutonen explained that current atmospheric signals suggest the vortex may be shifting directly over Finland.
“There are signs that it could bring colder weather for a longer period,” Huutonen noted, adding that such a shift often leads to extended cold spells. However, he cautioned that the polar vortex is not a guaranteed forecasting tool and its effects do not always translate to conditions at ground level.
Despite this uncertainty, meteorologists agree that Finland is entering a sustained cold phase following weeks of unseasonably warm conditions. The return of sub-zero temperatures marks a significant change, and forecasters expect more snowfall as winter firmly takes hold.
As Finland adjusts to the early arrival of winter, authorities are urging drivers to take extra caution on the roads. With temperatures expected to remain low and additional snowfall likely, the coming weeks may prove challenging across much of the country.