December in Dickinson is the snowiest month of the year. In December, the weather in Dickinson is typically freezing. Average daily high temperature in December is about 2 degrees below zero. On average, Dickinson has 11 sunny, 11 partly cloudy, 5 snowy, and 4 cloudy days in December. The snowfalls are usually light. December as well as February, March, April, and May is considered the most uncomfortable time to visit Dickinson.