Taking into account the local weather in Trois-Rives can help you maximize your time at the pool during your trip. The hottest months are usually July and August with an average temp of 64°F, while the coldest months are January and February with an average of 19°F. The snowiest months in Trois-Rives are January, February, April, and December, with each month seeing an average of 53 inches of snowfall.