S
M
T
W
T
F
S
29
34°
25°
30
40°
25°
1
36°
28°
2
37°
28°
3
40°
27°
4
39°
28°
5
39°
28°
6
43°
27°
7
40°
26°
8
36°
26°
9
38°
25°
10
36°
25°
11
40°
18°
12
34°
13°
13
28°
8°
14
27°
17°
15
30°
9°
16
31°
22°
17
34°
23°
18
33°
22°
19
34°
22°
20
34°
21°
21
35°
22°
22
34°
22°
23
37°
14°
24
36°
8°
25
30°
10°
26
23°
15°
27
29°
19°
28
30°
19°
29
36°
21°
30
36°
23°
31
39°
24°
1
37°
6°
2
38°
5°
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 23° to 43°, with overnight lows between 5° and 28°. The average high for December is 35° 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 Jefferson. See also: January | February | March.
