A Class 1 warning has been issued for the south west and parts of the eastern coast. The Swedish weather service, SMHI, defines class 1 as conditions that may put parts of the public at risk and affect some infrastructure such as trains or roads.
During the day, the north saw temperatures down to between minus 25 and minus 35 degrees.
All four departures between the northern towns of Luleå and Kiruna were cancelled by the operator, Norrtåg, due to the extreme cold. No replacement buses were called in.
Trains going from Sundsvall to Duved via Östersund were down on Monday morning. The Transport Authority said services were to resume at 8 A.M.
In the south, snowfall gave way to warmer temperatures later on Monday, but trains were still cancelled between Arboga and Kungsör.
Meteorologist Anna Hagendal at the Swedish weather service, SMHI, told Swedish Radio that the southern town of Kristianstad recorded 5 degrees Celsius on Monday morning, well above freezing. Rain and sleet is expected in the south Monday evening.