February in Sumy is the cloudiest month of the year. In February, the weather in Sumy is typically freezing. Average daily high temperature in February is about 13 degrees below zero. On average, Sumy has 21 cloudy, 7 snowy, and 1 sunny day in February. The snowfalls are usually light. February as well as January, April, October, and December is considered the most uncomfortable time to visit Sumy.