Update: Chicago's Record Wettest July

July 29 Update: A 24-hour total of 1.40" through this morning extends the July record to 11.15" and raises the month to number 7 overall.

Original post:
After getting an all-time record daily rainfall on Saturday, Chicago received another 0.71" on Wednesday, July 28. This pushed the monthly total to an all-time July record of 9.75". An additional 0.06" has fallen so far today, raising the amount to 9.81". July 2011 is now the 9th wettest calendar month at Chicago.

The 10 wettest months at Chicago are:

RANK..................VALUE..................MONTH/YEAR
1.....................17.10..................AUG/1987
2.....................14.17..................SEPT/1961
3.....................13.63..................SEPT/2008
4.....................12.25..................AUG/2001
5.....................12.06..................OCT/1954
6.....................11.28..................AUG/1885
7.....................10.58..................JUNE/1892
8......................9.96..................JUNE/1993
9......................9.81..................JULY/2011
10.....................9.70..................AUG/2007  

Rainfall amounts for the 24 hours ending this morning were considerably higher in Lake County to the north:

THE FOLLOWING ARE RAIN AMOUNTS FOR THE PREVIOUS 24-HOURS
 AS MEASURED IN THE MORNING BY NWS COOPERATIVE OBSERVERS
 AND COCORAHS OBSERVERS.
 OBSERVATIONS ARE USUALLY TAKEN BETWEEN 6 AND 8 AM.

 24-HOUR RAINFALL AMOUNTS
     FOR THURSDAY(07/28/11)...

ILLINOIS                                       RAIN
LOCATION (COUNTY):                           FALL (IN)

GURNEE 2NE (LAKE)............................4.10
BEACH PARK (LAKE)............................4.00
BEACH PARK 1W (LAKE).........................4.00
WAUKEGAN (LAKE)..............................3.46
ZION (LAKE)..................................3.27
WINTHROP HARBOR (LAKE).......................3.10
WINTHROP HARBOR 1SSW (LAKE)..................2.90
GURNEE 2W (LAKE).............................2.75