Chicago's Cool Summer

The Chicago Tribune has this story:

summer heat continues in short supply, continuing a trend that has dominated much of the 21st Century's opening decade. There have been only 162 days 90 degrees or warmer at Midway Airport over the period from 2000 to 2008. That's by far the fewest 90-degree temperatures in the opening nine years of any decade on record here since 1930.

This summer's highest reading to date has been just 91 degrees. That's unusual. Since 1928, only one year—2000—has failed to record a higher warm-season temperature by Aug. 13.