S
M
T
W
T
F
S
29
40°
24°
30
36°
21°
1
27°
19°
2
30°
21°
3
37°
22°
4
38°
22°
5
32°
20°
6
32°
18°
7
24°
16°
8
26°
18°
9
35°
19°
10
36°
19°
11
35°
18°
12
35°
17°
13
34°
18°
14
21°
16°
15
29°
14°
16
31°
13°
17
29°
9°
18
27°
7°
19
24°
2°
20
20°
0°
21
17°
12°
22
29°
12°
23
30°
10°
24
28°
6°
25
27°
10°
26
26°
13°
27
29°
14°
28
31°
11°
29
30°
9°
30
27°
4°
31
26°
-5°
1
24°
-5°
2
15°
4°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Cosmos
Cosmos's December 2026 forecast shows daily high temperatures ranging from 15° to 40°, with overnight lows between -5° and 24°. The average high for December is 29° with an average low of 13°. 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 Cosmos. See also: January | February | March.
