S
M
T
W
T
F
S
29
42°
30°
30
45°
32°
1
44°
31°
2
42°
32°
3
44°
30°
4
43°
29°
5
43°
29°
6
40°
30°
7
43°
28°
8
40°
27°
9
35°
27°
10
37°
26°
11
37°
27°
12
36°
26°
13
37°
19°
14
37°
14°
15
33°
14°
16
26°
16°
17
27°
14°
18
26°
23°
19
33°
22°
20
37°
20°
21
34°
15°
22
31°
17°
23
30°
11°
24
29°
18°
25
28°
16°
26
33°
11°
27
27°
11°
28
23°
12°
29
27°
12°
30
25°
15°
31
27°
21°
1
37°
19°
2
37°
12°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Casco
Casco's December 2026 forecast shows daily high temperatures ranging from 23° to 45°, with overnight lows between 11° and 32°. The average high for December is 35° with an average low of 21°. 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 Casco. See also: January | February | March.
