Illinois, Climate Division 5 18-Month Period Ending in March Average Temperature
Degrees Fahrenheit
189703
44.8
189803
45.2
189903
44.2
190003
43.5
190103
45.0
190203
44.0
190303
43.7
190403
43.2
190503
41.6
190603
43.7
190703
45.4
190803
44.1
190903
45.6
191003
44.9
191103
44.5
191203
43.6
191303
43.1
191403
45.8
191503
45.6
191603
44.2
191703
44.7
191803
42.4
191903
44.4
192003
45.8
192103
45.4
192203
47.9
192303
46.0
192403
44.9
192503
44.2
192603
45.1
192703
43.9
192803
45.3
192903
45.1
193003
44.6
193103
46.0
193203
48.0
193303
47.3
193403
46.0
193503
46.8
193603
44.2
193703
44.7
193803
45.3
193903
46.7
194003
45.9
194103
44.6
194203
46.8
194303
45.9
194403
44.8
194503
45.9
194603
45.4
194703
45.8
194803
45.4
194903
46.2
195003
46.7
195103
44.6
195203
44.0
195303
46.3
195403
47.4
195503
47.4
195603
46.2
195703
45.7
195803
45.4
195903
44.1
196003
44.6
196103
44.6
196203
44.4
196303
43.7
196403
44.4
196503
45.4
196603
45.3
196703
45.2
196803
44.3
196903
44.4
197003
43.8
197103
44.4
197203
45.8
197303
46.1
197403
46.3
197503
45.6
197603
46.3
197703
44.4
197803
42.4
197903
42.3
198003
43.4
198103
45.4
198203
44.2
198303
45.1
198403
46.0
198503
44.7
198603
45.8
198703
46.6
198803
46.8
198903
46.3
199003
45.7
199103
46.6
199203
48.3
199303
45.6
199403
44.7
199503
45.9
199603
46.1
199703
44.2
199803
45.7
199903
48.4
200003
48.2
200103
46.2
200203
46.8
200303
47.0
200403
45.6
200503
47.0
200603
48.1
200703
47.2
200803
46.9
200903
45.5
201003
44.9
201103
46.3
201203
47.8
201303
48.8
201403
44.3
201503
42.9
201603
46.9
201703
49.9
201803
48.0
201903
46.1