If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Three Forks: The hottest months are usually July and August, with an average temperature of 18°C, while the coldest months are December and January, with an average of -5°C. The snowiest months in Three Forks are February, January, March and October, with each month seeing an average of 31 cm of snowfall.