Illinois, Climate Division 3 36-Month Period Ending in May Average Temperature
Degrees Fahrenheit
189805
51.5
189905
50.4
190005
50.7
190105
50.6
190205
51.3
190305
51.1
190405
49.9
190505
49.2
190605
49.3
190705
50.3
190805
51.0
190905
51.1
191005
51.2
191105
51.2
191205
50.6
191305
50.6
191405
51.1
191505
52.1
191605
51.8
191705
50.7
191805
49.5
191905
50.3
192005
50.4
192105
52.2
192205
52.4
192305
52.9
192405
51.8
192505
51.1
192605
50.6
192705
50.7
192805
50.8
192905
50.8
193005
50.8
193105
51.3
193205
52.9
193305
53.1
193405
53.2
193505
52.5
193605
51.8
193705
51.6
193805
51.4
193905
52.7
194005
52.1
194105
52.1
194205
52.2
194305
52.1
194405
51.7
194505
51.1
194605
51.4
194705
51.2
194805
51.4
194905
51.5
195005
51.9
195105
50.9
195205
50.4
195305
50.5
195405
52.0
195505
53.0
195605
52.7
195705
52.3
195805
51.4
195905
51.1
196005
50.4
196105
50.4
196205
50.5
196305
50.5
196405
51.0
196505
51.2
196605
51.4
196705
50.9
196805
50.5
196905
50.3
197005
50.0
197105
50.2
197205
50.7
197305
51.0
197405
51.7
197505
51.0
197605
51.7
197705
50.8
197805
50.2
197905
48.9
198005
49.3
198105
50.7
198205
50.9
198305
51.1
198405
50.7
198505
51.4
198605
51.2
198705
51.9
198805
52.0
198905
52.4
199005
51.8
199105
52.1
199205
52.4
199305
51.7
199405
50.7
199505
50.3
199605
50.6
199705
50.4
199805
50.8
199905
52.0
200005
53.4
200105
52.6
200205
52.4
200305
51.6
200405
52.2
200505
51.9
200605
52.8
200705
52.9
200805
52.7
200905
51.6
201005
51.0
201105
51.0
201205
52.6
201305
52.9
201405
51.9
201505
50.1
201605
50.9
201705
53.0
201805
53.5
201905
52.6