Temperatures Reached 100 degrees in some spots again Wednesday July 20th, after Rockford and Kankakee both hit the century mark on Tuesday the 19th.
Rockford reached 100 degrees for the second day in a row Wednesday, marking the first time Rockford has had back to back 100 degree days since August 16th and 17th of 1988, 23 years ago! It had been 22 years since it last reached 100 degrees in Rockford, on July 10th, 1989.
In Chicago, while the official recording site at O’Hare only reached 99 degrees, a few spots including Northerly Island, Midway Airport and northwest suburban Chicago Executive Airport in Wheeling did reach 100 degrees Wednesday afternoon. The last time Chicago officially hit 100 degrees was six years ago, on July 24th 2005, when O’Hare, Midway and Northerly Island recorded highs of 102, 104 and 102 degrees respectively.
The hot temperatures Wednesday, combined with dew point temperatures in the lower and middle 70s, resulted in oppressive conditions which yielded peak heat index values ranging from 105 degrees to as high as 115 degrees during the warmest afternoon hours.
The following is a list of high temperatures and peak hourly heat index values for Wednesday July 20th 2011 across northern Illinois and northwest Indiana:
Location: Max T Peak HI
Chicago Northerly Island 100 112
WFO Chicago at Romeoville 99 107
Airport ASOS Locations:
Aurora/Sugar Grove 97 109
Chicago O’Hare 99 108
Chicago Midway 100 108
Chicago Executive/Wheeling 100 112
DuPage County/West Chicago 97 109
Rockford 100 108
Waukegan 98 108
Valparaiso 99 111
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Airport AWOS Locations: Highest Hourly
DeKalb 95 112
Gary 99 107
Joliet 99 107
Kankakee 99 115
Lansing 100 111
Morris 95 101
Peru 97 107
Pontiac 97 112
Rochelle 93 102