If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Biddeford: The hottest months are usually July and August with an average temp of 66°F, while the coldest months are January and February with an average of 30°F. The snowiest months in Biddeford are January, March, February, and December, with each month seeing an average of 7 inches of snowfall.