Rockford Monthly and Yearly Normals   (1971-2000)
Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F
27.2
33.0
45.5
59.1
71.2
79.9
83.1
80.9
73.9
61.8
45.5
32.0
57.8
Low °F
10.8
16.3
26.7
36.8
47.9
57.6
62.6
60.9
51.8
40.1
29.0
16.9
38.1
Mean °F
19.0
24.7
36.1
47.9
59.6
68.8
72.9
70.9
62.8
51.0
37.2
24.4
47.9
Precip. (in)
1.41
1.34
2.39
3.62
4.03
4.80
4.10
4.21
3.47
2.57
2.63
2.06
36.63
Snow (in)
10.3
8.0
5.6
1.4
0.0
0.0
0.0
0.0
0.0
0.1
2.6
10.8
38.8
HDD
1430
1143
912
522
215
36
5
14
136
444
832
1244
6933
CDD
0
0
1
7
49
162
263
205
74
7
0
0
768
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