December weather forecast in Missoula

December in Missoula is the most freezing month of the year. In December, the weather in Missoula is typically freezing. Average daily high temperature in December is about 1 degree below zero. On average, Missoula has 10 partly cloudy, 8 snowy, 8 cloudy, and 5 sunny days in December. The snowfalls are usually moderate. December as well as January, February, March, and April is considered the most uncomfortable time to visit Missoula.