If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Herbster: The hottest months are usually July and August with an average temp of 63°F, while the coldest months are January and February with an average of 21°F. The snowiest months in Herbster are March, January, December, and November, with each month seeing an average of 9 inches of snowfall.