August Was Slightly Warmer and Wetter than Normal, Illinois State Water Survey

Press Release

For Immediate Release September 1, 2006
August Was Slightly Warmer and Wetter than Normal
Jim Angel - (217) 333-0729, Fax: (217) 244-0220,
Eva Kingston - (217) 244-7270, Fax: (217) 333-6540,

"Preliminary data for Illinois indicate that August's 4.42 inches of rainfall was 0.77 inches above normal. The driest spots in the state were areas to the east of St. Louis and along the Illinois/Wisconsin border. These drier areas averaged 2 to 3 inches in most cases. To put those numbers into perspective, Flora reported 5.64 inches, the heaviest one-day rainfall, while Park Forest reported 9.38 inches, the largest monthly total," says State Climatologist Jim Angel of the Illinois State Water Survey (, a division of the Illinois Department of Natural Resources.

"As we all know, summer rainfall can be highly variable. For example, this month O'Hare Airport at Chicago reported 2.95 inches while nearby Midway Airport reported 7.12 inches," adds Angel

August's statewide average temperature was 74.7°F, 1.1°F above normal, and the 34th warmest August on record. Temperature extremes ranged from 102°F at Kaskaskia on August 3 to 45°F at Mt. Carroll on August 16.

"Statewide, summer (June–August) temperatures and precipitation, respectively, averaged 74.5°F, 0.7°F above normal, and 12.25 inches, 0.69 inches above normal. Combined with a near-normal occurrence of days above 90°F, this summer could be characterized as very moderate. Year-to-date precipitation for 2006 averaged 28.01 inches, 1.32 inches above normal. Year-to-date temperatures averaged 56.8°F, 2.5°F above normal and the second warmest such period since 1895," says Angel.

The National Weather Service (NWS) outlook for September calls for equal chances of both temperature and precipitation above, below, or at normal. The September–October outlook indicates an increased chance of temperatures above normal and precipitation below normal. The outlook for this winter (December–February) calls for an increased chance of temperatures above normal and equal chances of precipitation below, above, or at normal.

"In any event, most of Illinois has avoided drought this year so we can expect to see more vibrant fall colors this year," concludes Angel.

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