If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Henrietta: The hottest months are usually July and August with an average temp of 68°F, while the coldest months are January and February with an average of 30°F. The snowiest months in Henrietta are January, March, February, and December, with each month seeing an average of 12 inches of snowfall.