December in Whitehorse is the most freezing month of the year. In December, the weather in Whitehorse is typically freezing. Average daily high temperature in December is about 11 degrees below zero. On average, Whitehorse has 18 cloudy, 5 sunny, 5 partly cloudy, and 3 snowy days in December. The snowfalls are usually light. December as well as January, February, April, and July is considered the most uncomfortable time to visit Whitehorse.