July Was Hot, Sticky, and Wet, Illinois State Water Survey

Press Release

For Immediate Release August 2, 2006
July Was Hot, Sticky, and Wet
Jim Angel - (217) 333-0729, Fax: (217) 244-0220, jimangel@illinois.edu
Eva Kingston - (217) 244-7270, Fax: (217) 333-6540, eva@sws.uiuc.edu

"Preliminary data for Illinois indicate that July's 4.38 inches of rainfall was 0.56 inches above normal. The only areas with rainfall below normal were around Quincy and across south-central Illinois along Interstate 70. Amounts there generally were less than an inch below normal. Precipitation in northeastern and much of southern Illinois was above normal. Cisco, near Decatur, reported not only the heaviest one-day rainfall, 6.23 inches on July 27, which exceeded the amount from a 6-hour, 100-year storm, but also the highest monthly total, 14.27 inches," says State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu), a division of the Illinois Department of Natural Resources.

July's statewide average temperature was 77.3°F, 1.5°F above normal, and the 26 th hottest July on record. Temperature extremes ranged from 46°F at Mt. Carroll on July 7 to 101°F at Quincy on July 31.

"July 1936 is still the hottest July on record for Illinois with temperatures 7.7°F above normal and 1.4°F hotter than the second warmest July in 1901. July 1936 set several daily and monthly records across the state. West-central Illinois had some of the hottest temperatures in 1936, including 110°F on July 14 at Springfield, which also had 25 days at or above 90°F and 17 days at or above 100°F. The average high temperature in Springfield that July, before air conditioning was widely available, was 98.3°F," says Angel.

The National Weather Service (NWS) is calling for an increased chance of temperatures above normal for August and August–October. There are equal chances of precipitation being above, below, or at normal during the next three months. Historically, there is a degree of persistence between July and August temperatures so expect more of the same in August. "Stay tuned to NWS heat advisories and warnings, and take precautions to prevent heat exhaustion and heat stroke. For more information, consult www.weather.gov, www.sws.uiuc.edu/atmos/statecli/, and www.keepcool.illinois.gov," concludes Angel.

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