July 2010 Central IL Summary

July 2010 experienced above normal temperatures and precipitation across Illinois and much of the Midwest.  Rainfall amounts in extreme northwest Illinois ranged from 13 to 15 inches, which was 11 inches above normal and among the wettest July's on record from Freeport west to Dubuque.  By contrast a pocket of below normal rainfall by an inch or so occurred from Bloomington-Normal and Champaign-Urbana north to Pontiac and in far southeast Illinois near Paducah.  Below are graphics for July 2010 showing total rainfall, departure of normal and percent of normal rainfall across the Midwest and zoomed in on Illinois.  There are also graphics showing average July 2010 temperature, average monthly high temperature, average monthly low temperature and departure from normal temperatures across the Midwest and zoomed in on Illinois.

Total precipitation for July 2010 across the Midwest.  Image courtesy of the Midwestern Regional Climate Center Departure of normal precipitation for July 2010 acorss the Midwest.  Image courtesy of the Midwestern Regional Climate Center. Percentage of normal precipitation for July 2010 across the Midwest.  Image courtesy of the Midwestern Regional Climate Center.

Total Rainfall 
July 2010
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Departure of normal rainfall 
July 2010
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Percent of normal rainfall 
July 2010
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Total precipitation for July 2010 across Illinois.  Image courtesy of the Midwestern Regional Climate Center Departure of normal precipitation for July 2010 acorss Illinois.  Image courtesy of the Midwestern Regional Climate Center. Percentage of normal precipitation for July 2010 across Illinois.  Image courtesy of the Midwestern Regional Climate Center.

Total Rainfall (IL)
July 2010
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Departure of normal rainfall (IL)
July 2010
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Percent of normal rainfall (IL)
July 2010
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Average Temperature for July 2010 across the Midwest.  Image courtesy of the Midwestern Regional Climate Center Departure from Normal Temperature for July 2010 across the Midwest.  Image courtesy of the Midwestern Regional Climate Center. Average Temperature for July 2010 across Illinois.  Image courtesy of the Midwestern Regional Climate Center

Average Temperature 
July 2010
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Departure of normal Temperature July 2010
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Average Temperature (IL)
July 2010
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Average High Temperature for July 2010 across the Midwest.  Image courtesy of the Midwestern Regional Climate Center Departure of normal high temperature for July 2010 across the Midwest.  Image courtesy of the Midwestern Regional Climate Center. Departure of normal high temperature for July 2010 across Illinois.  Image courtesy of the Midwestern Regional Climate Center.

Average High Temperature
 July 2010
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Departure of normal 
High Temperature 
July 2010
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Average High Temperature (IL)
July 2010
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Average Low Temperature for July 2010 across the Midwest.  Image courtesy of the Midwestern Regional Climate Center Departure of normal low temperature for July 2010 across the Midwest.  Image courtesy of the Midwestern Regional Climate Center. Departure of normal low temperature for July 2010 across Illinois.  Image courtesy of the Midwestern Regional Climate Center.

Average Low Temperature
July 2010
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Departure of normal 
Low Temperature 
July  2010
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 Average Low Temperature (IL)
July 2010
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Several rounds of thunderstorms occurring during the month of July, some with severe storms and flooding, especially across northern and western Illinois.  The strongest storms to affect central Illinois during July 2010 were on Monday afternoon July 19th when 80 to 100 mph winds heavily damaged areas around Sullivan.  Lincoln, IL set a daily rainfall record of 2.09 inches on this day.  Check out the July 19th Severe Weather Event.  Other significant weather events included...

July 15... Localized heavy rain and flash flooding from Tuscola to near Charleston.

July 18... Severe thunderstorms downed trees and power liens in west central Illinois from Quincy through Jacksonville to the St Louis metro.

July 19... Severe storms produced a widespread swath of wind damage in central and southern Illinois.  Numerous trees and power lines were blown down, and property damage was done to several outbuildings, as well as roofs of homes and businesses.  The hardest hit areas were from near Carlinville through Taylorville to Sullivan and Mattoon in central Illinois, where wind gusts of 80 to 100 mph were reported.

July 19-20... Another round of strong storms impacted western and central Illinois with heavy rain and areas of flash flooding.  The heaviest rainfall amounts ranged from 4 to 6 inches in an area from Rushville to Pittsfield and from Sullivan to Mattoon.

July 21... A brief tornado was reported in Vermilion county about 20 miles southwest of Danville.  No damage was reported.

July 24... Severe storms in west central Illinois resulted in numerous reports of trees and power lines down west of a line from Havana to the St. Louis metro.

July 28... Up to 4.25 inches of rain in just one to two hours with thunderstorms Wednesday evening caused flooding around Beardstown and affected parts of Schuyler, Fulton, Cass and Mason counties.  

Temperatures were 1 to 3 degrees above normal across central Illinois during July with several hot and humid days with highs in the low to mid 90s and afternoon heat indices of 100 to 115 degrees.  There were four distinct heat waves during the month with heat advisories from July 4-7, 14-17, 21-24 and 27-28.  An excessive heat warning was issued as far north as I-72 on Saturday July 24th.  Record warm lows were set on Friday July 23rd at Springfield with 79 degrees and Lincoln with 77 degrees.  The Lawenceville airport in southeast Illinois had 19 days in July with highs in the 90s, with an average monthly high temperature of 90 degrees. Springfield and Decatur had 11 days in July with highs in the 90s. Bloomington had 10 days in July with highs in the 90s, Champaign-Urbana had 9 days in the 90s, Peoria and Charleston-Mattoon had 8 days in the 90s.   

Click the links below to view July 2010 climate summaries for seven cities across central Illinois.  Only the summaries for Peoria, Springfield, and Lincoln, IL are considered to be official climatological summaries, while the remaining sites provide supplemental data.


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