Steam rises from Lake Superior as the ship St. Clair comes to harbor on Sunday, Dec. 31, 2017, at Canal Park in Duluth, Minn. The ship arrived during the coldest holiday week (Dec. 25-31) ever recorded in Duluth. The average temperature for the seven-day period, including both highs and lows, was a bone-chilling –12.1°F. Photo: David Joles, Star Tribune via AP