Illinois, Climate Division 9 May-April Average Temperature
Degrees Fahrenheit
1901-2000
-99
189604
55.5
0.1
189704
55.8
0.4
189804
56.2
0.8
189904
53.7
-1.7
190004
55.6
0.2
190104
56.2
0.8
190204
54.4
-1.0
190304
56.3
0.9
190404
53.0
-2.4
190504
53.5
-1.9
190604
55.0
-0.4
190704
56.1
0.7
190804
54.8
-0.6
190904
56.3
0.9
191004
55.5
0.1
191104
54.9
-0.5
191204
54.4
-1.0
191304
55.2
-0.2
191404
56.6
1.2
191504
56.3
0.9
191604
55.0
-0.4
191704
55.5
0.1
191804
51.9
-3.5
191904
56.9
1.5
192004
54.9
-0.5
192104
57.0
1.6
192204
57.3
1.9
192304
56.6
1.2
192404
54.9
-0.5
192504
55.8
0.4
192604
54.7
-0.7
192704
56.5
1.1
192804
55.0
-0.4
192904
55.2
-0.2
193004
55.0
-0.4
193104
56.3
0.9
193204
58.9
3.5
193304
56.0
0.6
193404
56.8
1.4
193504
57.9
2.5
193604
53.5
-1.9
193704
57.1
1.7
193804
56.4
1.0
193904
56.7
1.3
194004
54.7
-0.7
194104
55.8
0.4
194204
57.5
2.1
194304
55.4
0.0
194404
55.6
0.2
194504
56.5
1.1
194604
55.7
0.3
194704
54.8
-0.6
194804
55.5
0.1
194904
55.9
0.5
195004
56.1
0.7
195104
53.4
-2.0
195204
55.2
-0.2
195304
56.5
1.1
195404
57.8
2.4
195504
56.9
1.5
195604
55.4
0.0
195704
56.5
1.1
195804
54.0
-1.4
195904
54.7
-0.7
196004
54.7
-0.7
196104
54.7
-0.7
196204
54.0
-1.4
196304
54.8
-0.6
196404
55.2
-0.2
196504
55.2
-0.2
196604
55.6
0.2
196704
55.4
0.0
196804
53.1
-2.3
196904
54.4
-1.0
197004
53.6
-1.8
197104
55.3
-0.1
197204
56.3
0.9
197304
55.0
-0.4
197404
56.8
1.4
197504
54.2
-1.2
197604
56.8
1.4
197704
51.8
-3.6
197804
53.4
-2.0
197904
53.6
-1.8
198004
53.8
-1.6
198104
56.5
1.1
198204
53.5
-1.9
198304
55.5
0.1
198404
54.3
-1.1
198504
55.3
-0.1
198604
55.6
0.2
198704
56.2
0.8
198804
56.0
0.6
198904
55.7
0.3
199004
55.2
-0.2
199104
56.2
0.8
199204
57.6
2.2
199304
53.7
-1.7
199404
54.9
-0.5
199504
56.1
0.7
199604
54.2
-1.2
199704
54.9
-0.5
199804
55.7
0.3
199904
57.9
2.5
200004
57.5
2.1
200104
54.9
-0.5
200204
57.2
1.8
200304
55.9
0.5
200404
56.0
0.6
200504
56.8
1.4
200604
57.6
2.2
200704
56.0
0.6
200804
57.0
1.6