Illinois, Climate Division 9 April-May Average Temperature
Degrees Fahrenheit
1901-1963
-99
189505
60.8
0.7
189605
66.8
6.7
189705
57.3
-2.8
189805
59.1
-1.0
189905
61.4
1.3
190005
60.9
0.8
190105
57.5
-2.6
190205
61.9
1.8
190305
61.4
1.3
190405
56.9
-3.2
190505
61.2
1.1
190605
62.4
2.3
190705
53.5
-6.6
190805
60.9
0.8
190905
58.3
-1.8
191005
57.9
-2.2
191105
61.5
1.4
191205
62.4
2.3
191305
60.1
0.0
191405
61.1
1.0
191505
62.9
2.8
191605
59.9
-0.2
191705
56.7
-3.4
191805
60.4
0.3
191905
59.3
-0.8
192005
57.8
-2.3
192105
61.6
1.5
192205
62.9
2.8
192305
58.4
-1.7
192405
57.8
-2.3
192505
61.7
1.6
192605
58.7
-1.4
192705
61.3
1.2
192805
58.0
-2.1
192905
60.4
0.3
193005
62.2
2.1
193105
58.6
-1.5
193205
61.3
1.2
193305
61.2
1.1
193405
62.1
2.0
193505
57.4
-2.7
193605
59.7
-0.4
193705
60.2
0.1
193805
61.8
1.7
193905
59.6
-0.5
194005
58.0
-2.1
194105
63.9
3.8
194205
61.5
1.4
194305
60.0
-0.1
194405
61.8
1.7
194505
58.8
-1.3
194605
60.4
0.3
194705
59.1
-1.0
194805
61.2
1.1
194905
60.3
0.2
195005
58.9
-1.2
195105
58.6
-1.5
195205
59.4
-0.7
195305
59.4
-0.7
195405
61.1
1.0
195505
63.7
3.6
195605
60.2
0.1
195705
61.9
1.8
195805
60.3
0.2
195905
62.7
2.6
196005
60.2
0.1
196105
55.4
-4.7
196205
62.8
2.7
196305
60.9
0.8