December in Grand Island is the snowiest month of the year. In December, the weather in Grand Island is typically cold. Average daily high temperature in December is about 1 degree above zero. On average, Grand Island has 17 partly cloudy, 11 sunny, 2 snowy, and 1 cloudy day in December. The snowfalls are usually light. December as well as January, February, and November is considered the most uncomfortable time to visit Grand Island.