Having a good idea of the weather in Petite-Riviere-Saint-Francois will help you enjoy your stay to the fullest. The hottest months are usually July and August, with an average temperature of 15°C, while the coldest months are January and February, with an average of -9°C. The snowiest months in Petite-Riviere-Saint-Francois are March, February, January and April, with each month seeing an average of 409 cm of snowfall.