December in Korosten is the windiest month of the year. In December, the weather in Korosten is typically freezing. Average daily high temperature in December is about zero. On average, Korosten has 12 cloudy, 9 rainy, 8 snowy, and 2 sunny days in December. The rains are usually moderate. December as well as February, March, April, and November is considered the most uncomfortable time to visit Korosten.