Illinois, Climate Division 5 24-Month Period Ending in May Average Temperature
Degrees Fahrenheit
189705
49.9
189805
49.9
189905
49.7
190005
49.2
190105
49.9
190205
49.5
190305
49.5
190405
48.0
190505
47.1
190605
48.9
190705
49.7
190805
49.5
190905
49.9
191005
49.9
191105
49.7
191205
49.0
191305
48.9
191405
50.6
191505
51.0
191605
49.7
191705
49.0
191805
48.2
191905
49.1
192005
50.0
192105
51.0
192205
52.5
192305
51.2
192405
49.9
192505
49.7
192605
49.4
192705
49.6
192805
50.1
192905
49.8
193005
49.6
193105
50.5
193205
52.7
193305
52.4
193405
51.2
193505
51.7
193605
50.0
193705
49.8
193805
51.1
193905
51.3
194005
50.7
194105
50.4
194205
51.7
194305
50.8
194405
50.0
194505
50.7
194605
50.6
194705
50.2
194805
50.3
194905
51.1
195005
51.3
195105
49.8
195205
49.0
195305
50.6
195405
52.2
195505
52.6
195605
51.5
195705
50.9
195805
50.5
195905
49.6
196005
49.5
196105
49.8
196205
49.9
196305
49.3
196405
49.7
196505
50.5
196605
50.0
196705
50.0
196805
49.4
196905
49.4
197005
49.4
197105
49.5
197205
50.8
197305
50.9
197405
51.0
197505
50.8
197605
50.8
197705
50.1
197805
47.9
197905
48.0
198005
49.1
198105
50.4
198205
49.9
198305
49.8
198405
50.4
198505
50.8
198605
51.1
198705
51.5
198805
51.8
198905
51.2
199005
51.1
199105
51.7
199205
52.5
199305
51.0
199405
49.4
199505
50.5
199605
50.7
199705
49.5
199805
50.8
199905
52.7
200005
52.9
200105
51.5
200205
51.3
200305
51.6
200405
51.3
200505
51.6
200605
52.4
200705
52.5
200805
51.5
200905
50.8
201005
50.5
201105
50.9
201205
53.1
201305
53.3
201405
50.0
201505
48.8
201605
51.4
201705
54.1
201805
52.9
201905
51.1