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