Average Temperatures for Illinois in April

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Average temperatures for April at cities throughout Illinois are listed below.

The tables give the normal maximum and minimum temperatures based on weather data collected from 1981 to 2010 by the US National Climatic Data Center.

You can jump to a separate table for each region of the state: Chicago Area, Northern Illinois, Central Illinois and Southern Illinois.

Chicago Area

Average April temperatures
High °F Low °F Place High °C Low °C
60 40 Aurora 16 5
57 38 Chicago Botanical Garden 14 3
59 42 Chicago Midway Airport 15 5
59 39 Chicago O'Hare Airport 15 4
60 42 Chicago University 15 5
59 37 Elgin 15 3
61 39 Joliet 16 4

Northern Illinois

Average temperatures in April
High °F Low °F Place High °C Low °C
57 38 Antioch 14 3
59 38 DeKalb 15 3
60 38 Dixon 16 3
60 37 Freeport 15 3
62 41 Moline 17 5
61 38 Rockford 16 3
55 37 Waukegan 13 3

Central Illinois

Normal temperatures for April
High °F Low °F Place High °C Low °C
67 47 Alton 19 8
67 46 Cahokia 19 8
65 42 Danville 18 6
63 42 Peoria 17 5
63 43 Quincy 17 6
65 42 Springfield 18 6
63 41 Urbana 17 5

Southern Illinois

Average April temperatures
High °F Low °F Place High °C Low °C
70 46 Cairo 21 8
66 43 Marion 19 6
65 44 Mt Vernon 18 6
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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