100-degree highs in Chicago

Dear Tom,
I don't think we've hit a 100-degree high yet this year. What is the
likelihood we might still get one?
Amy Chatfield
Dear Amy,
Not only haven't we hit 100 degrees yet this summer, but the city's warmest
day so far has been only 91, something that has never happened here since
Midway Airport weather records began in 1928. Since then, a 92-degree high
in 1951, 1979 and 2004 reigns as the year's lowest maximum temperature. The
odds are very much against getting 100 yet this year. Chicago has logged
only six September 100-degree days since 1871, and none since it reached 100
on Sept. 7, 1960. The latest 100 on record here is Sept. 15, 1939, when the
mercury peaked at 102. The city's last encounter with triple-digit heat was
July 24, 2005, when it hit 102 at O'Hare and 104 at Midway.