Wide Temperature Swings in October, Illinois State Water Survey

Press Release

For Immediate Release November 5, 2003
Wide Temperature Swings in October
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

“Although October temperatures across Illinois averaged 54.3 degrees, just 0.3 degrees below normal, the month actually had some record high daily temperatures (see graph). Kilbourne and Havana tied for the record high of 90 degrees on October 20 and 21, respectively, and Mt. Carroll had the lowest reading, 20 degrees on October 2. Many locations also had their first frost and temperature departures of up to 17 degrees below average on October 2, followed by alternating weeks of warm and cool weather,” 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.

October rainfall was 2.14 inches or 73 percent of average, the 40th driest October since 1895. Charleston reported 1.93 inches on October 14, the heaviest one-day rainfall total. Alton had the highest monthly rainfall total, 3.42 inches. Those amounts look better when compared with the 0.19-inch total in 1964, the driest October on record.

“North of I-80, precipitation remains below average for the past 1, 3, 6, and 12 months. Northwestern Illinois is 10.88 inches below average (70 percent of average), and northeastern Illinois is 7.82 inches below average (79 percent of average) for the period of November 1, 2002–October 31, 2003, the 4th and 13th driest November–October period since 1895,” says Angel.

National Weather Service outlooks for November are neutral on temperatures but show a slightly increased chance for below normal precipitation in Illinois. Winter outlooks also are neutral: no additional chance of above or below normal temperatures and precipitation.

“Now is the time to prepare for winter. Make sure your car and furnace are in good working order, stock up on winter supplies and clothing, and follow the changing weather situation” reminds Angel.

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