S
M
T
W
T
F
S
29
42°
33°
30
43°
33°
1
44°
34°
2
46°
33°
3
44°
32°
4
33°
23°
5
39°
19°
6
34°
15°
7
28°
16°
8
29°
21°
9
32°
20°
10
32°
20°
11
31°
17°
12
31°
17°
13
32°
23°
14
33°
26°
15
34°
27°
16
38°
23°
17
35°
21°
18
34°
19°
19
33°
18°
20
29°
17°
21
35°
21°
22
35°
25°
23
38°
24°
24
35°
23°
25
33°
24°
26
34°
22°
27
33°
19°
28
32°
18°
29
29°
15°
30
29°
15°
31
28°
14°
1
29°
15°
2
31°
16°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Rockford
Rockford's December 2026 forecast shows daily high temperatures ranging from 28° to 46°, with overnight lows between 14° and 34°. The average high for December is 34° with an average low of 22°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Rockford. See also: January | February | March.
