Illinois, Climate Division 6 18-Month Period Ending in June Average Temperature
Degrees Fahrenheit
1901-1967
-99
189606
50.8
-0.7
189706
51.6
0.1
189806
51.7
0.2
189906
50.3
-1.2
190006
50.4
-1.1
190106
51.5
0.0
190206
50.6
-0.9
190306
50.5
-1.0
190406
49.1
-2.4
190506
49.0
-2.5
190606
50.3
-1.2
190706
50.7
-0.8
190806
51.0
-0.5
190906
51.9
0.4
191006
51.0
-0.5
191106
51.7
0.2
191206
50.5
-1.0
191306
49.9
-1.6
191406
52.4
0.9
191506
51.5
0.0
191606
50.4
-1.1
191706
50.4
-1.1
191806
48.9
-2.6
191906
51.7
0.2
192006
51.0
-0.5
192106
52.4
0.9
192206
53.9
2.4
192306
52.0
0.5
192406
50.5
-1.0
192506
50.6
-0.9
192606
51.2
-0.3
192706
50.9
-0.6
192806
51.3
-0.2
192906
50.7
-0.8
193006
50.5
-1.0
193106
52.5
1.0
193206
54.2
2.7
193306
52.5
1.0
193406
53.3
1.8
193506
52.4
0.9
193606
50.4
-1.1
193706
51.6
0.1
193806
51.7
0.2
193906
53.8
2.3
194006
51.3
-0.2
194106
50.9
-0.6
194206
52.9
1.4
194306
51.6
0.1
194406
51.6
0.1
194506
51.9
0.4
194606
52.0
0.5
194706
52.2
0.7
194806
51.2
-0.3
194906
51.8
0.3
195006
52.1
0.6
195106
50.0
-1.5
195206
51.2
-0.3
195306
53.1
1.6
195406
53.9
2.4
195506
53.6
2.1
195606
52.4
0.9
195706
52.4
0.9
195806
51.0
-0.5
195906
50.9
-0.6
196006
51.0
-0.5
196106
50.4
-1.1
196206
51.1
-0.4
196306
50.9
-0.6
196406
51.8
0.3
196506
52.2
0.7
196606
51.4
-0.1
196706
51.0
-0.5