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