S
M
T
W
T
F
S
30
41°
28°
1
49°
28°
2
38°
23°
3
37°
26°
4
35°
21°
5
39°
22°
6
42°
24°
7
46°
28°
8
46°
29°
9
49°
29°
10
53°
32°
11
56°
29°
12
54°
36°
13
55°
31°
14
54°
31°
15
51°
34°
16
52°
30°
17
49°
27°
18
49°
30°
19
54°
32°
20
51°
34°
21
53°
34°
22
59°
24°
23
55°
40°
24
55°
35°
25
54°
43°
26
49°
36°
27
43°
31°
28
50°
38°
29
47°
20°
30
44°
20°
31
48°
23°
1
50°
30°
2
50°
32°
3
42°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Monticello
Monticello's December 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for December is ° with an average low of °. 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 Monticello. See also: January | February | March.
