Illinois, Climate Division 9 October-April Average Temperature
Degrees Fahrenheit
1901-1928
-99
189604
43.0
-0.1
189704
43.4
0.3
189804
44.7
1.6
189904
39.5
-3.6
190004
43.1
0.0
190104
43.2
0.1
190204
40.3
-2.8
190304
44.6
1.5
190404
39.6
-3.5
190504
41.1
-2.0
190604
42.2
-0.9
190704
44.0
0.9
190804
43.6
0.5
190904
44.3
1.2
191004
43.7
0.6
191104
43.5
0.4
191204
39.8
-3.3
191304
43.3
0.2
191404
43.8
0.7
191504
42.9
-0.2
191604
43.6
0.5
191704
43.3
0.2
191804
39.1
-4.0
191904
45.9
2.8
192004
42.1
-1.0
192104
46.8
3.7
192204
44.6
1.5
192304
44.2
1.1
192404
42.9
-0.2
192504
46.0
2.9
192604
40.9
-2.2
192704
44.1
1.0
192804
43.7
0.6