When you're dreaming of a getaway to Zaysan, year-round temperatures and rainfall may be important factors to consider. The hottest months are usually July and August with an average temp of 67°F, while the coldest months are January and February with an average of 15°F. The snowiest months in Zaysan are February, January, December, and March, with each month seeing an average of 21 inches of snowfall.