The average temperature for Illinois in April was 52.7
degrees, just 0.1 degree above the statewide normal.
The statewide average rainfall for April was 3.30 inches, 0.5
inches below normal. The highest monthly rainfall totals were
8.65 inches at Paris, and 7.98 inches at Effingham. In general,
the northern half of the state received 1.5 to 4 inches of rain,
and the southern half received 4 to 7 inches of rain.
[Lisa A. 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.