Visiting local bars in Irkutsk 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 June with an average temp of 60°F, while the coldest months are January and February with an average of 6°F. The snowiest months in Irkutsk are April, January, December, and February, with each month seeing an average of 12 inches of snowfall.