S
M
T
W
T
F
S
29
32°
18°
30
30°
19°
1
31°
25°
2
37°
30°
3
40°
23°
4
39°
23°
5
35°
24°
6
36°
24°
7
35°
23°
8
35°
23°
9
34°
22°
10
36°
21°
11
33°
18°
12
32°
17°
13
33°
19°
14
37°
27°
15
36°
22°
16
38°
23°
17
31°
27°
18
37°
29°
19
38°
28°
20
37°
26°
21
37°
26°
22
36°
28°
23
36°
24°
24
37°
27°
25
34°
18°
26
37°
10°
27
32°
10°
28
21°
17°
29
24°
16°
30
30°
22°
31
28°
27°
1
33°
27°
2
35°
23°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Valley
Valley's December 2026 forecast shows daily high temperatures ranging from 21° to 40°, with overnight lows between 10° and 30°. The average high for December is 34° with an average low of 22°. 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 Valley. See also: January | February | March.
