If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in L'Islet: 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 L'Islet are January, February, March, and November, with each month seeing an average of 47 inches of snowfall.