S
M
T
W
T
F
S
29
54°
38°
30
55°
37°
1
54°
38°
2
55°
36°
3
44°
32°
4
47°
28°
5
53°
35°
6
53°
35°
7
42°
31°
8
40°
24°
9
38°
21°
10
38°
24°
11
37°
30°
12
38°
28°
13
41°
27°
14
38°
20°
15
37°
24°
16
39°
29°
17
41°
31°
18
44°
27°
19
46°
20°
20
40°
19°
21
36°
18°
22
34°
19°
23
36°
26°
24
38°
24°
25
38°
19°
26
35°
14°
27
34°
17°
28
33°
14°
29
34°
15°
30
35°
24°
31
41°
21°
1
43°
15°
2
34°
12°
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 33° to 55°, with overnight lows between 12° and 38°. The average high for December is 41° with an average low of 25°. 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.
