Community Corner

History of Heat Indexes For Chicago Area

A heat index has tipped over 105 degrees only 31 time in the past twenty years.

Will this week's extreme heat be one for the history books? 

could tip heat indexes over 105 degrees at times Wednesday through Friday — a marker that has only been recorded 31 times over the past 20 years in the Chicago area

The National Weather Service records heat indexes over 105 degrees — and how long those high indexes last — at O'Hare International Airport.

Find out what's happening in Algonquin-Lake In The Hillswith free, real-time updates from Patch.

The heat index has only been recorded over 110 degrees six times since 1990. The highest index occurred on July 13, 1995 when the heat index reached 118 degrees.

Here is a list of heat indexes of 105 indexes and higher over the past 20 years:

Find out what's happening in Algonquin-Lake In The Hillswith free, real-time updates from Patch.

Date Heat Index Hours With Index Above 105 8/2/2006               105 4 8/1/2006 105 4 7/31/2006 108 5 7/17/2006 107 4 7/24/2005 107 5 8/21/2003 105 3 8/1/2003 105 1 7/21/2002 107 7 8/7/2001 105 1 7/23/2001 107 1 7/30/1999 114 12 7/29/1999 113 8 7/22/1999 105 1 7/4/1999 105 1 7/3/1999 105 1 6/27/1998 105 1 7/26/1998 105 1 8/16/1995 105 1 8/14/1995 107 3 8/13/1995 105 2 8/12/1995 111 6 7/15/1995 105 2 7/14/1995 116 11 7/13/1995 118 12 7/06/1994 105 1 7/05/1994 107 2 7/18/1993 109 2 8/09/1992 105 2 7/22/1991 107 2 8/27/1990 105 1 7/4/1990 109 8


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