In December, the weather in Ust-Avam is typically freezing. Average daily high temperature in December is about 21 degrees below zero. On average, Ust-Avam has 16 cloudy, 6 partly cloudy, 5 sunny, and 4 snowy 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 Ust-Avam.