Visiting local bars in Kostroma is more fun in good weather. These temperatures and rainfall averages can help you decide the best time for bar hopping. The hottest months are usually July and August with an average temp of 61°F, while the coldest months are January and February with an average of 19°F. The snowiest months in Kostroma are February, March, January, and December, with each month seeing an average of 91 inches of snowfall.