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