If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Petite-Riviere-Saint-Francois: The hottest months are usually July and August with an average temp of 60°F, while the coldest months are January and February with an average of 16°F. The snowiest months in Petite-Riviere-Saint-Francois are March, February, January, and April, with each month seeing an average of 153 inches of snowfall.