S
M
T
W
T
F
S
29
61°
39°
30
59°
39°
1
60°
31°
2
45°
26°
3
47°
28°
4
53°
34°
5
52°
35°
6
45°
29°
7
44°
25°
8
43°
22°
9
42°
22°
10
42°
27°
11
48°
27°
12
52°
30°
13
50°
29°
14
46°
26°
15
46°
28°
16
43°
31°
17
45°
27°
18
44°
22°
19
43°
20°
20
41°
18°
21
40°
21°
22
43°
27°
23
45°
24°
24
42°
20°
25
40°
19°
26
40°
21°
27
42°
20°
28
42°
21°
29
41°
25°
30
41°
21°
31
42°
20°
1
40°
16°
2
39°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Big Flat
Big Flat's December 2026 forecast shows daily high temperatures ranging from 39° to 61°, with overnight lows between 16° and 39°. The average high for December is 45° with an average low of 25°. 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 Big Flat. See also: January | February | March.
