Taking into account the local weather in Dexter 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 64°F, while the coldest months are January and February with an average of 23°F. The snowiest months in Dexter are March, January, April, and December, with each month seeing an average of 22 inches of snowfall.