S
M
T
W
T
F
S
29
41°
26°
30
50°
22°
1
50°
20°
2
45°
28°
3
48°
20°
4
49°
18°
5
36°
17°
6
35°
16°
7
34°
18°
8
35°
21°
9
38°
28°
10
45°
26°
11
46°
23°
12
39°
22°
13
35°
22°
14
35°
18°
15
37°
14°
16
33°
12°
17
31°
14°
18
30°
24°
19
37°
24°
20
37°
18°
21
43°
17°
22
32°
27°
23
43°
28°
24
43°
23°
25
42°
22°
26
42°
22°
27
39°
23°
28
40°
24°
29
41°
24°
30
41°
26°
31
44°
23°
1
44°
21°
2
42°
20°
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 30° to 50°, with overnight lows between 12° and 28°. The average high for December is 40° 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 Northampton. See also: January | February | March.
