Excessive Heat in Marquette, Wisconsin

Maximum daily heat index values ranged from 104 to 110 over the four days of July 17th through July 20th. An 80-year-old Illinois man died from heat-related causes while staying at his second home in Marquette County. The man had underlying medical problems that contributed to his death while spending time outside.

A dome of hot and humid air over the southern and central Plains built northward into the Upper Midwest from July 17th through July 21st. High temperatures climbed into the lower to middle 90s, which combined with muggy dew points in the middle 70s to lower 80s produce heat index values between 100 and 110 for four straight days. Three people were confirmed to have died due to the excessive heat: one each in the couinties of Columbia, Marquette, and Sauk. Based on news reports, it is estimated that about 25 people in Dane County received medical treatment for the heat, and 5 people each in the counties of Rock, Columbia, and Sauk. There may have been people in other counties that received medical treatment, but this could not be verified.