Illinois was warmer and wetter than normal in August and in the
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[September 05, 2018]
The statewide average temperature for Illinois
in August was 74.9 degrees, 1.3 degrees above normal. The statewide
average rainfall was 5.25 inches, 1.66 inches above normal,
according to Illinois State Climatologist Jim Angel of the Illinois
State Water Survey at the University of Illinois.
The warmest daily high temperature was 97 degrees reported at
the Chicago Botanical Gardens (Aug. 5), Chicago O’Hare (Aug. 4),
Jerseyville (Aug. 7), and Pittsfield (Aug. 29). The coolest
reading was 42 degrees reported at Rochelle on Aug. 22.
August was the 12th wettest August on record in Illinois.
Rainfall was heaviest in the west and southern portions of the
state with some areas 5 to 8 inches above normal. Meanwhile,
parts of east-central and northeast Illinois had below-normal
rainfall. The largest monthly total was in Arlington Heights
with 10.22 inches.
In the summer (June, July, and August), the statewide average
temperature was 75.0 degrees, 1.4 degrees above normal. The
statewide average precipitation for the summer was 14.86 inches,
2.99 inches above normal and the 13th wettest summer on record.
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Rainfall was heaviest in the northwest and south with
some areas reporting totals that were 6 inches or more above normal.
Meanwhile, a few spots around the state were persistently dry, as in
the area around Kankakee.
The largest summer rainfall total was 24.50 inches at Rockford. One
of the lowest summer rainfall totals was 5.92 inches reported at
Ashkum in Iroquois County, south of Kankakee. The rainfall total was
about half the normal summer rainfall for that area.
[Lisa A. Sheppard]