S
M
T
W
T
F
S
29
50°
31°
30
44°
24°
1
35°
20°
2
35°
22°
3
39°
30°
4
40°
30°
5
38°
29°
6
37°
25°
7
34°
24°
8
34°
27°
9
42°
28°
10
47°
29°
11
46°
29°
12
47°
28°
13
46°
29°
14
38°
26°
15
38°
26°
16
39°
23°
17
38°
17°
18
36°
14°
19
35°
9°
20
28°
11°
21
27°
21°
22
38°
20°
23
38°
16°
24
37°
11°
25
34°
24°
26
38°
25°
27
40°
24°
28
38°
23°
29
38°
21°
30
37°
13°
31
34°
9°
1
28°
10°
2
27°
21°
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 27° to 50°, with overnight lows between 9° and 31°. The average high for December is 38° with an average low of 22°. 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.
