December in Ribnovsk is the snowiest and the windiest month of the year. In December, the weather in Ribnovsk is typically freezing. Average daily high temperature in December is about 10 degrees below zero. On average, Ribnovsk has 21 snowy, 7 cloudy, and 3 sunny days in December. The snowfalls are usually moderate. December as well as January, February, and October is considered the most uncomfortable time to visit Ribnovsk.