If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Interlochen: The hottest months are usually August and July with an average temp of 64°F, while the coldest months are February and January with an average of 27°F. The snowiest months in Interlochen are January, February, November, and December, with each month seeing an average of 14 inches of snowfall.