S
M
T
W
T
F
S
29
59°
41°
30
59°
36°
1
55°
30°
2
48°
33°
3
50°
35°
4
51°
34°
5
48°
34°
6
52°
38°
7
54°
32°
8
52°
29°
9
48°
30°
10
45°
25°
11
45°
24°
12
36°
22°
13
39°
20°
14
36°
18°
15
33°
18°
16
35°
29°
17
40°
14°
18
38°
16°
19
31°
23°
20
35°
29°
21
43°
32°
22
42°
31°
23
43°
31°
24
46°
28°
25
47°
28°
26
45°
30°
27
46°
31°
28
Hist. Avg.
38°
24°
29
Hist. Avg.
38°
24°
30
Hist. Avg.
38°
24°
31
Hist. Avg.
38°
24°
1
Hist. Avg.
38°
23°
2
Hist. Avg.
38°
23°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Sullivan
Sullivan's December 2026 forecast shows daily high temperatures ranging from 31° to 59°, with overnight lows between 14° and 41°. The average high for December is 45° with an average low of 28°. 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 Sullivan. See also: January | February | March.
