Illinois, Climate Division 4 January-June Average Temperature
Degrees Fahrenheit
1901-1921
-99
189506
43.1
-1.6
189606
47.5
2.8
189706
43.9
-0.8
189806
46.0
1.3
189906
42.8
-1.9
190006
43.9
-0.8
190106
43.8
-0.9
190206
43.6
-1.1
190306
44.7
0.0
190406
41.0
-3.7
190506
43.0
-1.7
190606
45.0
0.3
190706
44.1
-0.6
190806
45.9
1.2
190906
45.1
0.4
191006
45.6
0.9
191106
48.1
3.4
191206
40.7
-4.0
191306
45.1
0.4
191406
45.9
1.2
191506
45.2
0.5
191606
43.8
-0.9
191706
42.4
-2.3
191806
44.0
-0.7
191906
46.9
2.2
192006
43.5
-1.2
192106
50.9
6.2