Tuesday night was unusually cold, with temperatures falling below zero in an area stretching from the far north of the country down as far south as Götaland, the southernmost quarter of Sweden.
At Ronneby Airport in Blekinge, southern Sweden, the lowest August temperature was recorded since measurements began there in 1945. Early on Wednesday morning the thermometer there was showing 0.7 degrees celsius.
The previous August record was 1.3 degrees, which was measured in Ronneby in 1978, according to the SMHI weather service.
Frost is expected in many parts of the country on Wednesday night. The mean daytime temperature is expected to be below normal in the whole country, with temperatures in Norrland forecast to be significantly below average for the time of year.