S
M
T
W
T
F
S
29
54°
45°
30
51°
39°
1
50°
43°
2
49°
44°
3
49°
41°
4
49°
42°
5
55°
44°
6
53°
40°
7
51°
41°
8
52°
40°
9
51°
43°
10
51°
46°
11
55°
44°
12
55°
42°
13
54°
37°
14
48°
36°
15
48°
38°
16
47°
36°
17
47°
37°
18
48°
40°
19
48°
40°
20
49°
41°
21
50°
45°
22
51°
42°
23
50°
44°
24
52°
44°
25
51°
42°
26
52°
38°
27
53°
41°
28
51°
45°
29
52°
46°
30
55°
41°
31
55°
40°
1
54°
42°
2
55°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Caspar
Caspar's December 2026 forecast shows daily high temperatures ranging from 47° to 55°, with overnight lows between 36° and 46°. The average high for December is 51° with an average low of 42°. 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 Caspar. See also: January | February | March.
