Just How Hot Did it Get on August 23 and 24?
According to the National Weather Service, it was pretty hot and humid August 23, and 24. August 24 was particularly notable as Chicago recorded its first 100°F temperature since 7/6/2012 and also saw its highest recorded heat index of 120°F (see the graphic for an explanation on an important caveat about this).
- An expansive ridge of high pressure over the central United States brought several days of record-breaking temperatures to this part of the country during the 4th week of August.
- In northern Illinois and northwest Indiana, a brief spurt of heat and humidity occurred on Sunday, August 20th before a cold front brought some relief to the area on Monday and Tuesday.
- The worst of the heat and humidity, however, arrived on Wednesday, August 23rd and continued into Thursday, August 24th.
- Chicago officially observed a high temperature of 98°F on the 23rd at O'Hare Airport, setting a new record daily high temperature for this date. The peak heat index observed at O'Hare Airport on the 23rd was 116°F**.
- Chicago officially observed a high temperature of 100°F on the 24th at O'Hare Airport, tying the record daily high temperature for this date. The peak heat index observed at O'Hare Airport on the 24th was 120°F**.
- Chicago logged two days in a row with peak heat indices greater than 115°F, which was the first time that this occurred since the deadly heat wave of July 1995.
- Rockford officially observed a high temperature of 97°F and also recorded a peak heat index of 118°F on both the 23rd and 24th.