If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Mio: The hottest months are usually July and August with an average temp of 64°F, while the coldest months are February and January with an average of 24°F. The snowiest months in Mio are January, November, February, and March, with each month seeing an average of 11 inches of snowfall.