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This year, September was tied in sixth place with 2005. The
warmest September on record was a tie between 1933 and 1925 with
a statewide average temperature of 72.2 degrees.
The average statewide temperature for January through September
of this year was 57.8 degrees, 2.1 degrees above normal and the
fifth warmest January through September on record. Every month,
except May, has been warmer than the 1981–2010 normal.
September rainfall was 3.47 inches for a statewide average,
which is just 0.24 inches above normal. Most areas received 3 to
5 inches of rain. However, southwestern Illinois was the wettest
part of the state with between 5 and 7.5 inches of rain.
In the heart of the wet area, two sites in St. Clair County
reported over 8 inches of rain: Mascoutah with 8.32 inches and
Mascoutah with 8.17 inches.
The statewide average precipitation for January through
September was 33.43 inches, 2.87 inches above normal. Although
it was the wettest July–August on record, the entire period was
ranked as only the 30th wettest on record because of the dry
January through June.
[Lisa Sheppard]
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 resources.
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