May Finished both Wetter and Warmer

For Illinois, the preliminary statewide average temperature was 64.1 degrees, 1.3 degrees above normal. Basically the first 17 days of the month ran on the cool side (1.4 degrees below normal) while the rest of the month ran on the warm side (4.8 degrees above normal). The map below shows the temperature departures.

The statewide average rainfall was 5.68 inches, 1.42 inches above normal or 133% of normal. The heaviest amounts for the month were in western Illinois between Quincy and the Quad Cities. Dallas City, along the Mississippi River, reported 9.07 inches for the month.

May 2010 temperature departure
Temperature Departure for May 2010 for the Midwest (click to enlarge).
Rainfall for the Midwest.
Rainfall totals for May 2010 for the Midwest (click to enlarge).
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