December in Achinsk is the snowiest month of the year. In December, the weather in Achinsk is typically freezing. Average daily high temperature in December is about 11 degrees below zero. On average, Achinsk has 12 snowy, 12 cloudy, 4 sunny, 2 partly cloudy, and 1 rainy day in December. The snowfalls are usually light. December as well as January, February, September, and October is considered the most uncomfortable time to visit Achinsk.