If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Colfax: The hottest months are usually July and August with an average temp of 72°F, while the coldest months are December and February with an average of 44°F. The rainiest months in Colfax are December, March, February, and January, with each month seeing an average of 9 inches of rainfall.