S
M
T
W
T
F
S
29
34°
21°
30
34°
20°
1
33°
25°
2
35°
28°
3
36°
27°
4
39°
31°
5
38°
32°
6
41°
32°
7
41°
31°
8
38°
29°
9
35°
28°
10
34°
28°
11
41°
25°
12
38°
26°
13
37°
17°
14
33°
15°
15
30°
19°
16
29°
20°
17
29°
21°
18
33°
24°
19
34°
28°
20
36°
28°
21
37°
27°
22
40°
28°
23
41°
28°
24
44°
24°
25
41°
16°
26
36°
13°
27
27°
18°
28
30°
26°
29
38°
25°
30
38°
29°
31
41°
30°
1
42°
24°
2
42°
17°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Cassopolis
Cassopolis's December 2026 forecast shows daily high temperatures ranging from 27° to 44°, with overnight lows between 13° and 32°. The average high for December is 36° 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 Cassopolis. See also: January | February | March.