In December, the weather in Staromyshastovskaya is typically cold. Average daily high temperature in December is about 5 degrees above zero. On average, Staromyshastovskaya has 13 rainy, 11 cloudy, 5 sunny, and 2 partly cloudy days in December. The rains are usually moderate. December as well as January, February, and March is considered the most uncomfortable time to visit Staromyshastovskaya.