S
M
T
W
T
F
S
29
47°
30°
30
45°
28°
1
44°
30°
2
44°
28°
3
45°
25°
4
43°
27°
5
43°
29°
6
49°
38°
7
53°
39°
8
57°
35°
9
58°
30°
10
45°
28°
11
46°
32°
12
48°
29°
13
46°
29°
14
41°
28°
15
42°
24°
16
40°
24°
17
40°
22°
18
39°
24°
19
40°
30°
20
41°
37°
21
49°
34°
22
54°
29°
23
51°
37°
24
52°
36°
25
56°
34°
26
51°
33°
27
44°
29°
28
46°
25°
29
44°
27°
30
39°
18°
31
49°
17°
1
34°
19°
2
39°
21°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Commonwealth
Commonwealth's December 2026 forecast shows daily high temperatures ranging from 34° to 58°, with overnight lows between 17° and 39°. The average high for December is 46° with an average low of 29°. 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 Commonwealth. See also: January | February | March.
