Other facts from our historical weather data: Which is the warmest month in Saint-Chaffrey? August has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Saint-Chaffrey? The coldest month is January with an average maximum temperature of -4°C (25°F). Which is the wettest month in Saint-Chaffrey? November tops the wettest month list with 124mm (4.9 in) of rainfall. Which is the driest month in Saint-Chaffrey? August is the driest month with 65mm (2.6 in) of precipitation. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.