January in Muonio is the sunniest and the most freezing month of the year. In January, the weather in Muonio is typically freezing. Average daily high temperature in January is about 9 degrees below zero. On average, Muonio has 13 cloudy, 9 snowy, 5 sunny, and 4 partly cloudy days in January. The snowfalls are usually light. January as well as February, April, May, and June is considered the most uncomfortable time to visit Muonio.