Illinois, Climate Division 5 December-May Average Temperature
Degrees Fahrenheit
1901-1927
-99
189605
40.2
2.9
189705
37.3
0.0
189805
38.5
1.2
189905
34.9
-2.4
190005
36.6
-0.7
190105
35.8
-1.5
190205
35.6
-1.7
190305
38.0
0.7
190405
32.7
-4.6
190505
35.4
-1.9
190605
37.9
0.6
190705
37.4
0.1
190805
39.0
1.7
190905
38.2
0.9
191005
36.7
-0.6
191105
39.0
1.7
191205
34.1
-3.2
191305
38.1
0.8
191405
38.7
1.4
191505
36.8
-0.5
191605
37.0
-0.3
191705
35.3
-2.0
191805
35.2
-2.1
191905
40.3
3.0
192005
34.4
-2.9
192105
42.8
5.5
192205
39.7
2.4
192305
36.9
-0.4
192405
37.1
-0.2
192505
38.3
1.0
192605
36.3
-1.0
192705
39.1
1.8