Weather is probably a major factor when you plan your trip to Saint-Philemon, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August with an average temp of 62°F, while the coldest months are January and February with an average of 18°F. The snowiest months in Saint-Philemon are January, February, March, and November, with each month seeing an average of 47 inches of snowfall.