Weather will likely play an important role when you plan your trip to Sparta, 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 68°F, while the coldest months are January and February with an average of 23°F. The snowiest months in Sparta are January, April, March, and February, with each month seeing an average of 9 inches of snowfall.