How does the rainy summer of 2011 in Chicago stack up historically so far?

Through August 20th, 18.39" of rainfall have been observed at Chicago-O'Hare in meteorological summer (June 1-August 31) so far, which means that this summer is already the 5th wettest summer on record in Chicago. Records have been kept since 1871. The 1871-2010 seasonal normal rainfall total through this date is 10.45". With a frontal system moving through the region on Tuesday, there is  good chance for showers and thunderstorms, and thus a good chance to add to this rainfall total and continue to move up in the rankings. Below is an updated list of the top-10 wettest summers in Chicago, including this summer's total through August 20th.



20.28 1957
20.15 1993
18.92 1885
18.39 2011
18.38 1924
17.82 2001
17.45 1950
16.81 2010
16.22 1977

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