October Weather Summary -- Cooler and Wetter than Normal

Continuing the trend of wetter than normal weather that began in September, much of central and southeast Illinois saw rainfall amounts between 3 and 6 inches during October (center image, click to enlarge).  The heaviest amounts were in a corridor extending from around Beardstown and Meredosia, east through Lincoln, to around Danville and Hoopeston.  In these areas, rainfall totals of 5 to 6 inches were common, including widespread 2 to 3 inch amounts that fell on the 13-14th.  By the end of the month, the lingering drought conditions were mainly confined to the Illinois River Valley northwestward (lower right image).

Average temperature departure from normal for October.  Information courtesy of High Plains Regional Climate Center.

October 12 rainfall.  Image courtesy of the High Plains Regional Climate Center.

Drought monitor as of October 30

October 2012 temperatures versus normal

October 2012 total rainfall

Drought status as of October 30

Temperatures averaged below normal (left image), ranging from 2 to 4 degrees below normal east of a Peoria to Olney line.  Some of the more extended cool periods were from the 5th through the 12th, and again from the 26th through the 31st.  A pair of sharp cold fronts brought significant temperature falls during the month.  After high temperatures on the 4th that were in the lower 80s in most areas, highs were only in the middle to upper 40s the next two days, setting several records for coldest high temperature observed on those two days.  A period of well above normal temperatures on the 21-25th came crashing to an end during the afternoon and evening of the 25th.  As a cold front passed, temperatures in the 75 to 80 degree range plunged from 15 to 25 degrees in just an hour, and were in the 40s within a few hours.  By the next morning, temperatures were in the upper 20s northwest of the Illinois River.

The remnants of Hurricane Sandy, which transitioned into a powerful extratropical storm toward the end of the month, impacted areas as far west as Illinois.  Wind gusts on the 30th ranged from 25 to 40 mph, highest near the Indiana border, while further north, waves on southern Lake Michigan peaked in excess of 20 feet.  Visit this link at the Chicago NWS web page for more information in that area.

Here are the monthly climate summaries for area cities.  Only the summaries for Peoria, Springfield and Lincoln are considered "official", meaning they are the station of record for their respective locations.  The other summaries are "supplemental", meaning another location in the area is the official climate station for that city.

Climate data for other area cities is available at http://www.nws.noaa.gov/climate/xmacis.php?wfo=ilx .

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