Weather can make or break a roadtrip, so here’s some data about year-round temperatures in Chapais to help you plan yours: The hottest months are usually July and August with an average temp of 58°F, while the coldest months are January and February with an average of 9°F. The snowiest months in Chapais are January, November, February, and March, with each month seeing an average of 15 inches of snowfall.