S
M
T
W
T
F
S
29
47°
34°
30
45°
37°
1
45°
36°
2
46°
35°
3
45°
38°
4
45°
35°
5
44°
32°
6
44°
32°
7
45°
33°
8
44°
33°
9
44°
34°
10
46°
31°
11
45°
33°
12
44°
33°
13
45°
34°
14
44°
35°
15
44°
32°
16
45°
31°
17
44°
31°
18
44°
33°
19
45°
33°
20
44°
31°
21
43°
31°
22
43°
32°
23
44°
33°
24
43°
34°
25
43°
34°
26
44°
32°
27
44°
34°
28
42°
38°
29
46°
39°
30
48°
36°
31
49°
37°
1
Hist. Avg.
43°
36°
2
Hist. Avg.
43°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Northampton
Northampton's December 2026 forecast shows daily high temperatures ranging from 42° to 49°, with overnight lows between 31° and 39°. The average high for December is 45° with an average low of 34°. 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 Northampton. See also: January | February | March.
