If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Keosauqua: The hottest months are usually July and August with an average temp of 73°F, while the coldest months are January and February with an average of 32°F. The snowiest months in Keosauqua are January, December, November, and February, with each month seeing an average of 6 inches of snowfall.