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.

 

23.48

1987
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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