Illinois May-October Average Temperature
Degrees Fahrenheit
189510
66.7
189610
66.9
189710
68.1
189810
67.2
189910
68.1
190010
69.4
190110
68.6
190210
66.4
190310
65.9
190410
65.4
190510
66.9
190610
67.4
190710
64.5
190810
67.2
190910
65.7
191010
66.1
191110
68.8
191210
66.9
191310
68.3
191410
69.2
191510
64.9
191610
67.3
191710
63.2
191810
67.4
191910
68.2
192010
67.4
192110
69.5
192210
68.9
192310
66.3
192410
64.9
192510
66.4
192610
67.0
192710
66.1
192810
66.1
192910
65.4
193010
68.1
193110
69.3
193210
67.5
193310
69.2
193410
70.3
193510
66.3
193610
70.8
193710
67.1
193810
68.6
193910
69.0
194010
67.6
194110
69.5
194210
66.8
194310
67.2
194410
68.8
194510
64.9
194610
66.6
194710
68.4
194810
66.7
194910
67.9
195010
66.4
195110
66.2
195210
67.2
195310
69.3
195410
68.5
195510
68.6
195610
68.5
195710
66.6
195810
66.3
195910
68.6
196010
67.0
196110
66.4
196210
68.0
196310
68.2
196410
67.6
196510
67.3
196610
65.6
196710
64.4
196810
66.6
196910
66.4
197010
67.8
197110
68.1
197210
66.4
197310
68.0
197410
65.3
197510
67.4
197610
64.6
197710
68.1
197810
67.2
197910
66.6
198010
68.1
198110
65.8
198210
66.8
198310
68.6
198410
67.3
198510
66.9
198610
68.1
198710
68.3
198810
68.3
198910
66.2
199010
66.4
199110
69.5
199210
64.9
199310
66.4
199410
66.8
199510
67.7
199610
66.4
199710
65.9
199810
69.5
199910
67.7
200010
67.9
200110
67.2
200210
67.9
200310
66.3
200410
66.7
200510
69.0
200610
66.8
200710
70.3
200810
66.6
200910
65.5
201010
69.6
201110
68.1
201210
68.9
201310
67.4
201410
66.6
201510
68.2
201610
69.8
201710
68.0
201810
70.0
201910
68.2