S
M
T
W
T
F
S
29
37°
23°
30
35°
25°
1
36°
34°
2
47°
33°
3
46°
34°
4
44°
31°
5
48°
28°
6
46°
22°
7
38°
20°
8
32°
28°
9
37°
28°
10
41°
25°
11
39°
22°
12
33°
20°
13
33°
18°
14
30°
19°
15
30°
21°
16
31°
22°
17
32°
23°
18
31°
26°
19
33°
28°
20
38°
28°
21
40°
27°
22
40°
26°
23
38°
24°
24
37°
25°
25
32°
23°
26
36°
24°
27
37°
24°
28
35°
23°
29
38°
26°
30
32°
19°
31
38°
17°
1
Hist. Avg.
34°
19°
2
Hist. Avg.
34°
18°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Dartmouth
Dartmouth's December 2026 forecast shows daily high temperatures ranging from 30° to 48°, with overnight lows between 17° and 34°. The average high for December is 37° 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 Dartmouth. See also: January | February | March.
