First Half of September – Cool and Dry

Based on preliminary data, the first half of September in Illinois has been cooler and drier than average. The statewide average temperature was 67.6 degrees, 2.1 degrees below average. The statewide average precipitation was 1.26 inches, 0.26 inches below average or 83 percent of average.

September 1-15 precipitation in Illinois
September 1-15, 2011, precipitation in Illinois.
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