S
M
T
W
T
F
S
29
52°
41°
30
56°
40°
1
53°
39°
2
54°
35°
3
43°
36°
4
49°
34°
5
54°
39°
6
50°
36°
7
42°
28°
8
40°
25°
9
39°
25°
10
40°
30°
11
42°
36°
12
45°
31°
13
45°
31°
14
40°
23°
15
39°
28°
16
40°
33°
17
43°
32°
18
45°
30°
19
44°
23°
20
41°
22°
21
37°
22°
22
36°
26°
23
39°
30°
24
40°
28°
25
39°
21°
26
37°
17°
27
35°
20°
28
34°
20°
29
35°
18°
30
35°
26°
31
39°
21°
1
40°
18°
2
35°
14°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Williamstown
Williamstown's December 2026 forecast shows daily high temperatures ranging from 34° to 56°, with overnight lows between 14° and 41°. The average high for December is 42° with an average low of 28°. 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 Williamstown. See also: January | February | March.
