Weather can make or break a roadtrip, so here's some data about year-round temperatures in Farson to help you plan yours: The hottest months are usually July and August with an average temp of 62°F, while the coldest months are January and December with an average of 18°F. The snowiest months in Farson are March, January, February, and April, with each month seeing an average of 11 inches of snowfall.