If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Fontanella: The hottest months are usually July and August with an average temp of 55°F, while the coldest months are January and February with an average of 27°F. The rainiest months in Fontanella are August, June, July, and May, with each month seeing an average of 9 inches of rainfall.