Weather is only one factor, but it can really affect your travel plans, especially when you're planning an extended stay in Mound City. The hottest months are usually July and August with an average temp of 71°F, while the coldest months are January and February with an average of 22°F. The snowiest months in Mound City are April, March, December, and October, with each month seeing an average of 6 inches of snowfall.