December in Grand Forks is the snowiest month of the year. In December, the weather in Grand Forks is typically freezing. Average daily high temperature in December is about 8 degrees below zero. On average, Grand Forks has 25 cloudy, 4 snowy, and 2 sunny days in December. The snowfalls are usually light. December as well as January, February, March, and April is considered the most uncomfortable time to visit Grand Forks.