August and summer were cool and dry in Illinois
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[September 11, 2013]
CHAMPAIGN -- The statewide
average precipitation for August was 1.38 inches, according to Jim
Angel, state climatologist at the Illinois State Water Survey,
Prairie Research Institute, University of Illinois. It was the
third-driest August on record and 2.22 inches below the 1981-2010
The driest August in Illinois was in 1952, with only 1.12 inches of
rain. Even though last year was remembered for the severe drought,
the August 2012 precipitation was 3.64 inches, which was 0.04 inches
The only areas with significant precipitation this August were
far southern Illinois and a portion of northeastern Illinois.
Elsewhere, precipitation amounts were far below average. A few areas
in western Illinois received less than 0.1 inch.
The statewide average temperature for August was 73.1 degrees F,
which is only 0.4 degrees below average. August temperatures were
noteworthy for being much below average for the first half of the
month and much above average for the latter half, effectively
canceling each other out by the end of the month.
The statewide average precipitation for summer -- June, July and
August -- was 9.93 inches, which is 1.92 inches below average. While
June was above average with 5.41 inches, both July and August were
below average, with 3.14 inches and 1.38 inches respectively. It was
an improvement over last summer, when the average precipitation for
the summer was 6.92 inches, 4.93 inches below the 1981-2010 average.
The statewide average temperature for this summer was 72.5
degrees, 1.1 degrees below the 1981-2010 average. June, July and
August were all below average, but July had the coolest departure of
2.4 degrees below average.
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The statewide average precipitation for 2013 so far was 33.48
inches, which was 6.0 inches above the 1981-2010 average. This was
far higher than last year, when the statewide precipitation was only
17.79 inches through the end of August -- an amount almost half of
this year's precipitation.
The statewide average temperature for 2013 so far was 46.3
degrees, which was 1.2 degrees below the 1981-2010 average. This was
far cooler than last year, when the statewide temperature was 52.7
degrees, 5.2 degrees above average.
[Text from file received from
State Water Survey]
The Illinois State Water Survey at the University of Illinois at
Urbana-Champaign, a division of the Prairie Research Institute, is
the primary agency in Illinois concerned with water and atmospheric