Taking into account the local weather in Thayerville is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually July and August with an average temp of 66°F, while the coldest months are January and February with an average of 32°F. The snowiest months in Thayerville are January, December, February, and May, with each month seeing an average of 31 inches of snowfall.