If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Afton: 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 21°F. The snowiest months in Afton are March, April, January, and February, with each month seeing an average of 7 inches of snowfall.