The statewide average rainfall was 5.6 inches, which was 1
inch above average and the 22nd wettest May on record. Some of
the heaviest amounts were seen in northwest Illinois and just
southeast of St. Louis.
The highest reported monthly rainfall total was 9.41 inches at
Red Bud (Randolph County). The next highest total was 8.77
inches at Mt. Carroll.
Most of Illinois was near average to above average in rainfall
for May. There was a stretch of Illinois to the east of
Interstate 57 from near Champaign southward with below-average
rainfall.
[Lisa A. Sheppard, Illinois 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 resources.
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