S
M
T
W
T
F
S
29
41°
27°
30
44°
31°
1
45°
30°
2
43°
30°
3
45°
28°
4
42°
26°
5
43°
27°
6
40°
28°
7
43°
27°
8
36°
25°
9
33°
25°
10
34°
24°
11
33°
25°
12
34°
22°
13
35°
18°
14
35°
16°
15
31°
15°
16
30°
16°
17
31°
17°
18
30°
22°
19
33°
21°
20
36°
19°
21
32°
17°
22
30°
16°
23
29°
9°
24
31°
17°
25
27°
14°
26
31°
6°
27
26°
5°
28
21°
6°
29
25°
3°
30
23°
9°
31
25°
20°
1
38°
14°
2
36°
9°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Grafton
Grafton's December 2026 forecast shows daily high temperatures ranging from 21° to 45°, with overnight lows between 3° and 31°. The average high for December is 34° with an average low of 19°. 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 Grafton. See also: January | February | March.
