Rockford, Illinois September-March Average Temperature
Degrees Fahrenheit
1952-1985
-99
195203
35.3
-1.1
195303
37.9
1.5
195403
39.2
2.8
195503
37.0
0.6
195603
36.3
-0.1
195703
37.6
1.2
195803
35.5
-0.9
195903
34.9
-1.5
196003
34.7
-1.7
196103
38.0
1.6
196203
34.9
-1.5
196303
34.7
-1.7
196403
38.8
2.4
196503
35.3
-1.1
196603
38.0
1.6
196703
37.1
0.7
196803
37.2
0.8
196903
36.9
0.5
197003
34.8
-1.6
197103
36.4
0.0
197203
38.5
2.1
197303
38.3
1.9
197403
38.3
1.9
197503
36.3
-0.1
197603
38.8
2.4
197703
32.2
-4.2
197803
32.5
-3.9
197903
33.7
-2.7
198003
35.8
-0.6
198103
37.4
1.0
198203
34.4
-2.0
198303
40.1
3.7
198403
35.3
-1.1
198503
36.7
0.3