S
M
T
W
T
F
S
29
36°
14°
30
33°
11°
1
26°
22°
2
31°
13°
3
33°
9°
4
30°
21°
5
29°
23°
6
35°
23°
7
36°
24°
8
37°
21°
9
28°
14°
10
31°
18°
11
Hist. Avg.
26°
10°
12
Hist. Avg.
25°
9°
13
Hist. Avg.
25°
9°
14
Hist. Avg.
25°
9°
15
Hist. Avg.
24°
8°
16
Hist. Avg.
24°
8°
17
Hist. Avg.
24°
8°
18
Hist. Avg.
24°
7°
19
Hist. Avg.
23°
7°
20
Hist. Avg.
23°
7°
21
Hist. Avg.
23°
6°
22
Hist. Avg.
23°
6°
23
Hist. Avg.
22°
6°
24
Hist. Avg.
22°
6°
25
Hist. Avg.
22°
5°
26
Hist. Avg.
22°
5°
27
Hist. Avg.
22°
5°
28
Hist. Avg.
22°
4°
29
Hist. Avg.
22°
4°
30
Hist. Avg.
22°
4°
31
Hist. Avg.
22°
4°
1
Hist. Avg.
21°
4°
2
Hist. Avg.
21°
4°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Monticello
Monticello's December 2026 forecast shows daily high temperatures ranging from 26° to 37°, with overnight lows between 9° and 24°. The average high for December is 32° with an average low of 18°. 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.
