S
M
T
W
T
F
S
29
46°
28°
30
42°
23°
1
33°
20°
2
30°
12°
3
33°
25°
4
36°
24°
5
34°
24°
6
32°
17°
7
29°
13°
8
27°
15°
9
31°
15°
10
34°
24°
11
36°
24°
12
39°
22°
13
35°
24°
14
32°
23°
15
35°
20°
16
36°
20°
17
33°
16°
18
31°
14°
19
32°
9°
20
25°
7°
21
23°
20°
22
33°
18°
23
33°
16°
24
32°
7°
25
29°
11°
26
26°
20°
27
32°
19°
28
33°
17°
29
30°
7°
30
29°
14°
31
27°
3°
1
28°
-1°
2
20°
6°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Jefferson
Jefferson's December 2026 forecast shows daily high temperatures ranging from 20° to 46°, with overnight lows between -1° and 28°. The average high for December is 32° with an average low of 16°. 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 Jefferson. See also: January | February | March.
