Visiting local bars in Istra is more fun in good weather. These temperatures and rainfall averages can help you determine the best time for bar hopping. The hottest months are usually July and August with an average temp of 62°F, while the coldest months are January and February with an average of 22°F. The snowiest months in Istra are December, January, November, and February, with each month seeing an average of 44 inches of snowfall.