December in Ossora is the windiest month of the year. In December, the weather in Ossora is typically freezing. Average daily high temperature in December is about 8 degrees below zero. On average, Ossora has 16 snowy, 6 sunny, 5 partly cloudy, and 4 cloudy days in December. The snowfalls are usually heavy. December as well as January, February, May, and September is considered the most uncomfortable time to visit Ossora.