S
M
T
W
T
F
S
29
50°
31°
30
47°
23°
1
36°
16°
2
35°
18°
3
41°
29°
4
41°
29°
5
39°
28°
6
38°
24°
7
35°
21°
8
33°
22°
9
40°
23°
10
43°
27°
11
43°
27°
12
47°
26°
13
45°
27°
14
39°
24°
15
40°
24°
16
41°
22°
17
38°
14°
18
37°
12°
19
35°
8°
20
30°
8°
21
28°
19°
22
37°
14°
23
38°
15°
24
38°
8°
25
34°
22°
26
35°
23°
27
38°
22°
28
38°
21°
29
37°
17°
30
36°
14°
31
34°
5°
1
31°
5°
2
28°
17°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Jansen
Jansen's December 2026 forecast shows daily high temperatures ranging from 28° to 50°, with overnight lows between 5° and 31°. The average high for December is 38° with an average low of 20°. 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 Jansen. See also: January | February | March.
