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