S
M
T
W
T
F
S
29
45°
37°
30
43°
34°
1
42°
30°
2
41°
29°
3
41°
33°
4
48°
37°
5
50°
38°
6
50°
40°
7
42°
27°
8
40°
26°
9
41°
31°
10
40°
32°
11
50°
28°
12
47°
26°
13
39°
26°
14
39°
24°
15
37°
22°
16
37°
21°
17
36°
21°
18
36°
22°
19
35°
20°
20
35°
23°
21
36°
26°
22
36°
29°
23
40°
32°
24
43°
36°
25
49°
27°
26
50°
24°
27
47°
23°
28
35°
26°
29
37°
19°
30
38°
17°
31
33°
18°
1
32°
23°
2
35°
22°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Peconic
Peconic's December 2026 forecast shows daily high temperatures ranging from 32° to 50°, with overnight lows between 17° and 40°. The average high for December is 41° with an average low of 27°. 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 Peconic. See also: January | February | March.
