Illinois, Climate Division 4 60-Month Period Ending in April Average Temperature
Degrees Fahrenheit
1901-1956
-99
190004
49.9
-0.7
190104
50.0
-0.6
190204
49.8
-0.8
190304
49.7
-0.9
190404
49.4
-1.2
190504
49.0
-1.6
190604
48.9
-1.7
190704
49.3
-1.3
190804
49.2
-1.4
190904
50.0
-0.6
191004
50.4
-0.2
191104
50.3
-0.3
191204
49.9
-0.7
191304
50.1
-0.5
191404
50.3
-0.3
191504
50.6
0.0
191604
50.4
-0.2
191704
50.6
0.0
191804
49.8
-0.8
191904
49.9
-0.7
192004
49.4
-1.2
192104
50.1
-0.5
192204
50.6
0.0
192304
51.6
1.0
192404
51.2
0.6
192504
51.4
0.8
192604
50.6
0.0
192704
50.3
-0.3
192804
50.0
-0.6
192904
50.0
-0.6
193004
49.9
-0.7
193104
50.5
-0.1
193204
51.2
0.6
193304
51.3
0.7
193404
51.7
1.1
193504
52.4
1.8
193604
51.5
0.9
193704
51.2
0.6
193804
51.3
0.7
193904
51.4
0.8
194004
50.8
0.2
194104
51.5
0.9
194204
51.6
1.0
194304
51.3
0.7
194404
50.9
0.3
194504
51.2
0.6
194604
51.1
0.5
194704
50.6
0.0
194804
50.9
0.3
194904
51.1
0.5
195004
50.9
0.3
195104
50.6
0.0
195204
50.5
-0.1
195304
50.6
0.0
195404
51.0
0.4
195504
51.2
0.6
195604
51.7
1.1