100s at Chicago

Dear Tom,
I am in the third grade, and our class is studying about weather. My teacher
said I should ask you if it ever got to 100 degrees in Chicago.
Zain Mohammed
Dear Zain,
Chicago's temperature has indeed risen to 100 degrees, though not very
often. Chicago weather historian Frank Wachowski reports that the
thermometer at Midway Airport has registered at least one day at or above
100 degrees in 30 of the 80 years (1928-2007) for which we have data at that
location.
And one (but only one) of those super-hot days occurred in May, and right at
this time of the year. On May 31, 1934, the Midway temperature zoomed to
102. Chicago's all-time high temperature was also recorded at Midway
Airport: a scorching 109 degrees on July 23, 1934.
Chicago's most recent 100-degree day occurred three years ago: 104 on July
24, 2005.