Excessive Heat in Clinton, Illinois

Hot and extremely humid conditions led to a week of heat index values over 105 degrees. The heat index peaked near 115 degrees.

A period of hot and very humid weather began in mid July. Although thunderstorms brought some heat relief in the first few days, the heat and humidity expanded on July 22 and lasted through the 29th or 30th for many locations. While temperatures generally topped out in the mid 90s, extreme humidity led to heat index values near or over 110 degrees for a week or more.