S
M
T
W
T
F
S
29
49°
30°
30
53°
36°
1
49°
36°
2
49°
28°
3
56°
24°
4
47°
23°
5
39°
28°
6
48°
29°
7
53°
34°
8
55°
36°
9
39°
22°
10
55°
39°
11
57°
35°
12
Hist. Avg.
46°
30°
13
Hist. Avg.
46°
30°
14
Hist. Avg.
45°
30°
15
Hist. Avg.
45°
30°
16
Hist. Avg.
45°
30°
17
Hist. Avg.
45°
29°
18
Hist. Avg.
44°
29°
19
Hist. Avg.
44°
29°
20
Hist. Avg.
44°
29°
21
Hist. Avg.
44°
29°
22
Hist. Avg.
44°
28°
23
Hist. Avg.
43°
28°
24
Hist. Avg.
43°
28°
25
Hist. Avg.
43°
28°
26
Hist. Avg.
43°
28°
27
Hist. Avg.
42°
28°
28
Hist. Avg.
42°
28°
29
Hist. Avg.
42°
27°
30
Hist. Avg.
42°
27°
31
Hist. Avg.
42°
27°
1
Hist. Avg.
42°
27°
2
Hist. Avg.
42°
27°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Mount Vernon
Mount Vernon's December 2026 forecast shows daily high temperatures ranging from 39° to 57°, with overnight lows between 22° and 39°. The average high for December is 50° with an average low of 31°. 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 Mount Vernon. See also: January | February | March.
