Illinois, Climate Division 1 January-June Average Temperature
Degrees Fahrenheit
1901-1952
-99
189506
40.5
-2.1
189606
45.2
2.6
189706
42.0
-0.6
189806
43.5
0.9
189906
40.5
-2.1
190006
41.6
-1.0
190106
41.5
-1.1
190206
41.7
-0.9
190306
42.9
0.3
190406
38.7
-3.9
190506
40.1
-2.5
190606
42.5
-0.1
190706
41.2
-1.4
190806
43.2
0.6
190906
42.3
-0.3
191006
42.8
0.2
191106
45.3
2.7
191206
37.2
-5.4
191306
42.1
-0.5
191406
42.9
0.3
191506
42.2
-0.4
191606
40.8
-1.8
191706
38.9
-3.7
191806
41.1
-1.5
191906
44.5
1.9
192006
40.8
-1.8
192106
48.4
5.8
192206
44.5
1.9
192306
41.7
-0.9
192406
39.8
-2.8
192506
44.4
1.8
192606
41.6
-1.0
192706
43.4
0.8
192806
43.0
0.4
192906
40.2
-2.4
193006
43.8
1.2
193106
45.4
2.8
193206
44.5
1.9
193306
45.6
3.0
193406
45.8
3.2
193506
42.1
-0.5
193606
39.5
-3.1
193706
41.6
-1.0
193806
45.5
2.9
193906
44.7
2.1
194006
40.0
-2.6
194106
44.1
1.5
194206
44.1
1.5
194306
41.8
-0.8
194406
44.5
1.9
194506
42.8
0.2
194606
45.8
3.2
194706
40.1
-2.5
194806
42.0
-0.6
194906
43.9
1.3
195006
41.4
-1.2
195106
41.0
-1.6
195206
44.5
1.9