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