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