December in Fort Nelson is the most freezing month of the year. In December, the weather in Fort Nelson is typically freezing. Average daily high temperature in December is about 14 degrees below zero. On average, Fort Nelson has 11 cloudy, 10 partly cloudy, 6 sunny, and 4 snowy days in December. The snowfalls are usually light. December as well as January, February, April, and November is considered the most uncomfortable time to visit Fort Nelson.