S
M
T
W
T
F
S
29
42°
28°
30
41°
32°
1
50°
28°
2
47°
30°
3
43°
29°
4
54°
24°
5
53°
24°
6
38°
25°
7
39°
25°
8
40°
23°
9
39°
21°
10
37°
21°
11
33°
22°
12
34°
22°
13
35°
23°
14
36°
22°
15
35°
25°
16
36°
27°
17
36°
23°
18
37°
31°
19
38°
30°
20
39°
27°
21
37°
23°
22
35°
21°
23
34°
20°
24
35°
25°
25
34°
24°
26
35°
25°
27
33°
24°
28
35°
22°
29
33°
19°
30
35°
18°
31
38°
13°
1
Hist. Avg.
34°
16°
2
Hist. Avg.
34°
16°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Cornwall-on-Hudson
Cornwall-on-Hudson's December 2026 forecast shows daily high temperatures ranging from 33° to 54°, with overnight lows between 13° and 32°. The average high for December is 38° with an average low of 24°. 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 Cornwall-on-Hudson. See also: January | February | March.
