S
M
T
W
T
F
S
29
47°
38°
30
50°
37°
1
45°
36°
2
44°
36°
3
41°
35°
4
42°
34°
5
40°
34°
6
41°
35°
7
41°
35°
8
38°
34°
9
40°
34°
10
44°
35°
11
44°
34°
12
38°
32°
13
36°
28°
14
32°
28°
15
33°
31°
16
36°
32°
17
43°
34°
18
44°
32°
19
41°
32°
20
39°
28°
21
33°
26°
22
35°
31°
23
39°
30°
24
41°
29°
25
30°
18°
26
30°
22°
27
33°
25°
28
35°
24°
29
33°
23°
30
34°
24°
31
32°
16°
1
29°
14°
2
27°
14°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Summit
Summit's December 2026 forecast shows daily high temperatures ranging from 27° to 50°, with overnight lows between 14° and 38°. The average high for December is 38° with an average low of 29°. 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 Summit. See also: January | February | March.
