S
M
T
W
T
F
S
29
55°
25°
30
49°
22°
1
39°
21°
2
40°
22°
3
43°
24°
4
47°
30°
5
50°
37°
6
53°
37°
7
55°
34°
8
54°
28°
9
49°
30°
10
44°
26°
11
43°
20°
12
37°
21°
13
38°
19°
14
37°
18°
15
35°
19°
16
36°
17°
17
35°
16°
18
34°
21°
19
35°
21°
20
39°
27°
21
44°
32°
22
49°
30°
23
49°
25°
24
42°
20°
25
37°
19°
26
36°
19°
27
35°
23°
28
42°
20°
29
43°
16°
30
35°
14°
31
32°
16°
1
33°
23°
2
42°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Mason
Mason's December 2026 forecast shows daily high temperatures ranging from 32° to 55°, with overnight lows between 14° and 37°. The average high for December is 42° with an average low of 23°. 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 Mason. See also: January | February | March.
