temperature in iron mountain mi
Average Weather in Iron Mountain Michigan, United States. Iron Mountain has a humid continental climate with warm summers and no dry season. The temperature typically varies from 7Â°F to 80Â°F over the course of the year, and is rarely below -12Â°F or above 89Â°F. The warm season lasts for 116 days, from May 22 to September 15, with an average daily high temperature above 69Â°F.