If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Le Lavancher: The hottest months are usually July and August with an average temp of 54°F, while the coldest months are January and February with an average of 24°F. The rainiest months in Le Lavancher are May, July, June, and August, with each month seeing an average of 10 inches of rainfall.