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