S
M
T
W
T
F
S
29
39°
16°
30
38°
15°
1
39°
26°
2
43°
26°
3
40°
25°
4
39°
20°
5
38°
18°
6
38°
19°
7
43°
21°
8
41°
22°
9
44°
20°
10
41°
22°
11
44°
24°
12
43°
24°
13
47°
25°
14
42°
22°
15
45°
19°
16
44°
18°
17
41°
19°
18
45°
24°
19
50°
23°
20
48°
20°
21
43°
23°
22
46°
23°
23
47°
22°
24
46°
26°
25
45°
20°
26
49°
13°
27
42°
14°
28
35°
24°
29
40°
17°
30
41°
24°
31
43°
25°
1
46°
23°
2
46°
20°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Diamond
Diamond's December 2026 forecast shows daily high temperatures ranging from 35° to 50°, with overnight lows between 13° and 26°. The average high for December is 43° 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 Diamond. See also: January | February | March.
