Illinois, Climate Division 4 August-March Average Temperature
Degrees Fahrenheit
189603
42.8
189703
42.5
189803
44.6
189903
40.0
190003
43.0
190103
44.2
190203
41.3
190303
43.0
190403
39.6
190503
41.2
190603
43.0
190703
45.5
190803
43.6
190903
44.8
191003
43.7
191103
43.7
191203
39.6
191303
43.8
191403
44.9
191503
43.4
191603
43.0
191703
42.8
191803
39.9
191903
45.5
192003
42.2
192103
47.2
192203
44.7
192303
44.4
192403
43.0
192503
43.5
192603
42.3
192703
43.9
192803
44.7
192903
43.1
193003
42.5
193103
45.6
193203
48.3
193303
43.8
193403
44.1
193503
45.4
193603
40.8
193703
44.5
193803
45.1
193903
46.4
194003
42.9
194103
43.9
194203
45.9
194303
42.9
194403
43.3
194503
44.6
194603
44.8
194703
43.8
194803
45.0
194903
45.1
195003
44.5
195103
41.6
195203
43.0
195303
44.9
195403
46.3
195503
44.9
195603
44.0
195703
45.0
195803
42.6
195903
42.9
196003
42.3
196103
44.9
196203
42.2
196303
41.6
196403
44.0
196503
42.5
196603
44.7
196703
43.5
196803
42.2
196903
42.8
197003
41.4
197103
43.5
197203
45.3
197303
44.4
197403
45.5
197503
43.2
197603
46.3
197703
39.5
197803
39.6
197903
41.2
198003
43.2
198103
44.8
198203
41.5
198303
46.2
198403
43.2
198503
44.4
198603
43.2
198703
45.5
198803
44.0
198903
44.6
199003
44.8
199103
45.4
199203
46.6
199303
42.7
199403
42.4
199503
45.7
199603
42.9
199703
43.3
199803
46.1
199903
46.9
200003
46.9
200103
42.7
200203
47.3
200303
43.8
200403
45.5
200503
45.4
200603
47.0
200703
45.1
200803
45.5
200903
43.5
201003
43.1
201103
44.2
201203
48.9
201303
44.5
201403
40.8
201503
42.3
201603
48.8
201703
49.4
201803
44.7
201903
44.2