OCTOBER 2010 WAS WARM & DRY ACROSS CENTRAL AND SOUTHEAST ILLINOIS
Summer refused to leave central and southeast Illinois in October, at least during the first half of the month, as temperatures averaged above normal. Champaign-Urbana had a high of 86F on Saturday, October 9th which tied the record high set back in 1949. The high of of 85 degrees on Sunday, October 10th, was just a degree shy of the record high of 86 degrees set in 1962. Champaign airport had a high of 88 degrees on the 9th and 10th of October! Despite the unusally warm temperatures (especially with daytime highs) most of the month, there was a large diurnal swing in temperatures on many of the days, allowing early morning lows to drop some 30 to 35 degrees from the afternoon highs. A widespread freeze occurred on the morning of the 29th, as early morning lows dropped into the mid and upper 20s. Precipitation for the month was below to well below normal, with the extreme southeast counties (along and south of Interstate 70) placed in a moderate drought at the end of the month.
The maps below are courtesy of NOAA MRCC, showing precipitation and mean temperature for October 2010, and departure from normal. The last figure below represents the latest drought conditions across the Ohio Valley as of 11/02/2010. For a more detailed look at the drought conditions along the Ohio River valley north into southeast Illinois, refer to the U.S.DROUGHT MONITOR
The weather became active across the region from the 24th through the 27th of the month as isolated severe thunderstorms moved over parts of central Illinois on the 24th, producing wind damage in Springfield. An intense area of low pressure moved out of the Rockies on 26th and pushed across Iowa and finally into Minnesota. This particular storm system produced much more in the way of severe weather over the central portion of the country. A thin line of severe storms moved across central, east central and southeast Illinois on the morning of the 26th resulting in numerous reports of winds in excess of 60 mph. From the late morning of the 26th through the 27th, the intense area of low pressure produced strong gradient winds of from 40 to 60 mph.
The preliminary climate summaries for October are listed below. Only the summaries for Peoria, Springfield, and Lincoln are considered to be official climatological summaries. The remaining 4 sites are "supplemental", meaning another station in the area is the official climatological station for that location.