In December, the weather in Barter Island is typically freezing. Average daily high temperature in December is about 18 degrees below zero. On average, Barter Island has 25 cloudy, 4 sunny, 1 snowy, and 1 partly cloudy day in December. The snowfalls are usually light. December as well as January, February, March, and April is considered the most uncomfortable time to visit Barter Island.