In December, the weather in Ostrovnoye is typically freezing. Average daily high temperature in December is about 22 degrees below zero. On average, Ostrovnoye has 16 partly cloudy, 8 sunny, 6 cloudy, and 1 snowy day in December. The snowfalls are usually light. December as well as January, February, March, and November is considered the most uncomfortable time to visit Ostrovnoye.