In December, the weather in Barnaul is typically freezing. Average daily high temperature in December is about 10 degrees below zero. On average, Barnaul has 14 snowy, 14 cloudy, 2 sunny, and 1 partly cloudy day in December. The snowfalls are usually light. December as well as January, February, April, and October is considered the most uncomfortable time to visit Barnaul.