Weather will likely play an important role when you plan your trip to Three Forks, and keep in mind that cheaper options are usually available when the weather isn’t as good. The hottest months are usually July and August with an average temp of 64°F, while the coldest months are December and January with an average of 23°F. The snowiest months in Three Forks are February, January, March, and October, with each month seeing an average of 12 inches of snowfall.