S
M
T
W
T
F
S
29
34°
14°
30
34°
16°
1
35°
14°
2
34°
14°
3
32°
16°
4
34°
25°
5
41°
21°
6
41°
26°
7
42°
16°
8
37°
14°
9
33°
20°
10
44°
19°
11
40°
14°
12
Hist. Avg.
34°
15°
13
Hist. Avg.
34°
15°
14
Hist. Avg.
34°
14°
15
Hist. Avg.
34°
14°
16
Hist. Avg.
34°
14°
17
Hist. Avg.
34°
14°
18
Hist. Avg.
34°
14°
19
Hist. Avg.
34°
14°
20
Hist. Avg.
34°
14°
21
Hist. Avg.
34°
14°
22
Hist. Avg.
34°
14°
23
Hist. Avg.
34°
14°
24
Hist. Avg.
34°
14°
25
Hist. Avg.
34°
14°
26
Hist. Avg.
34°
14°
27
Hist. Avg.
34°
14°
28
Hist. Avg.
34°
14°
29
Hist. Avg.
34°
14°
30
Hist. Avg.
34°
14°
31
Hist. Avg.
34°
14°
1
Hist. Avg.
34°
14°
2
Hist. Avg.
34°
14°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Casper
Casper's December 2026 forecast shows daily high temperatures ranging from 32° to 44°, with overnight lows between 14° and 26°. The average high for December is 37° with an average low of 18°. 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 Casper. See also: January | February | March.
