If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Whitehall: The hottest months are usually July and August with an average temp of 59°F, while the coldest months are December and January with an average of 19°F. The snowiest months in Whitehall are February, October, March, and December, with each month seeing an average of 7 inches of snowfall.