Event narrative (NOAA)
The second heat wave of the summer developed during the end of July and continued into early August. High temperatures at Northerly Island in downtown Chicago reached 88 on July 28th, 93 on July 29th, 90 on July 30th and 98 on July 31st. The peak heat index at Northerly Island reached 100 on July 28th, 105 on July 29th, 106 on July 30th, and 116 on July 31st. The low temperature on the morning of July 21st was only 81. At Ohare Airport, the high temperature reached 93 on July 28th, 94 on July 29th, 90 on July 30th and 99 on July 31st. The peak heat index reached 94 on July 28th, 100 on July 29th, 98 on July 30th and 107 on July 31st. A cold front moved south across Lake Michigan during the late morning and early afternoon of July 30th. This front brought a period of cooler temperatu
Other notable heat events in Illinois
Source: NOAA/NCEI Storm Events Database. Deaths and injuries are those NOAA classifies as direct. Damage is the reporting office's estimate at the time and is not inflation-adjusted. This is a catalogue record, not a forecast.