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