February in Kostroma is the snowiest, the cloudiest, and the most freezing month of the year. In February, the weather in Kostroma is typically freezing. Average daily high temperature in February is about 10 degrees below zero. On average, Kostroma has 19 snowy, 4 sunny, 3 cloudy, and 3 partly cloudy days in February. The snowfalls are usually heavy. February as well as January, May, September, and October is considered the most uncomfortable time to visit Kostroma.