Illinois, Climate Division 1 May-April Average Temperature
Degrees Fahrenheit
1901-2000
-99
189604
48.7
0.5
189704
48.0
-0.2
189804
48.7
0.5
189904
46.0
-2.2
190004
48.3
0.1
190104
48.4
0.2
190204
48.0
-0.2
190304
47.9
-0.3
190404
44.6
-3.6
190504
46.1
-2.1
190604
48.0
-0.2
190704
48.4
0.2
190804
47.2
-1.0
190904
48.3
0.1
191004
47.7
-0.5
191104
47.8
-0.4
191204
46.0
-2.2
191304
48.1
-0.1
191404
49.3
1.1
191504
49.1
0.9
191604
46.2
-2.0
191704
46.9
-1.3
191804
44.5
-3.7
191904
49.8
1.6
192004
46.7
-1.5
192104
50.9
2.7
192204
49.9
1.7
192304
48.7
0.5
192404
48.2
0.0
192504
47.3
-0.9
192604
46.4
-1.8
192704
48.0
-0.2
192804
48.0
-0.2
192904
47.3
-0.9
193004
47.4
-0.8
193104
50.1
1.9
193204
51.4
3.2
193304
48.7
0.5
193404
49.4
1.2
193504
50.5
2.3
193604
45.3
-2.9
193704
49.3
1.1
193804
49.5
1.3
193904
49.6
1.4
194004
48.6
0.4
194104
48.7
0.5
194204
50.7
2.5
194304
47.2
-1.0
194404
47.9
-0.3
194504
49.7
1.5
194604
48.1
-0.1
194704
47.9
-0.3
194804
48.5
0.3
194904
48.4
0.2
195004
48.5
0.3
195104
45.9
-2.3
195204
47.2
-1.0
195304
48.9
0.7
195404
50.7
2.5
195504
49.1
0.9
195604
48.4
0.2
195704
49.2
1.0
195804
47.5
-0.7
195904
46.7
-1.5
196004
47.8
-0.4
196104
48.2
0.0
196204
46.6
-1.6
196304
47.4
-0.8
196404
49.1
0.9
196504
47.6
-0.6
196604
48.6
0.4
196704
47.9
-0.3
196804
47.3
-0.9
196904
47.7
-0.5
197004
46.7
-1.5
197104
48.1
-0.1
197204
48.6
0.4
197304
48.8
0.6
197404
49.2
1.0
197504
47.0
-1.2
197604
50.4
2.2
197704
45.9
-2.3
197804
46.2
-2.0
197904
45.8
-2.4
198004
47.8
-0.4
198104
49.7
1.5
198204
46.2
-2.0
198304
49.8
1.6
198404
48.2
0.0
198504
48.7
0.5
198604
47.7
-0.5
198704
50.4
2.2
198804
49.3
1.1
198904
49.6
1.4
199004
48.8
0.6
199104
49.2
1.0
199204
50.6
2.4
199304
46.7
-1.5
199404
47.2
-1.0
199504
49.3
1.1
199604
47.5
-0.7
199704
47.0
-1.2
199804
49.9
1.7
199904
51.4
3.2
200004
51.1
2.9
200104
48.1
-0.1
200204
51.4
3.2
200304
48.9
0.7
200404
49.7
1.5
200504
50.0
1.8
200604
51.3
3.1
200704
49.4
1.2
200804
49.4
1.2
200904
47.8
-0.4
201004
48.6
0.4
201104
49.2
1.0
201204
52.6
4.4
201304
49.6
1.4