S
M
T
W
T
F
S
29
50°
33°
30
50°
24°
1
47°
24°
2
42°
22°
3
37°
20°
4
34°
26°
5
38°
23°
6
45°
18°
7
37°
17°
8
33°
21°
9
34°
20°
10
33°
17°
11
33°
17°
12
32°
20°
13
35°
15°
14
33°
14°
15
30°
13°
16
32°
13°
17
30°
24°
18
31°
22°
19
Hist. Avg.
35°
19°
20
Hist. Avg.
35°
19°
21
Hist. Avg.
35°
19°
22
Hist. Avg.
35°
18°
23
Hist. Avg.
34°
18°
24
Hist. Avg.
34°
18°
25
Hist. Avg.
34°
18°
26
Hist. Avg.
34°
17°
27
Hist. Avg.
34°
17°
28
Hist. Avg.
33°
17°
29
Hist. Avg.
33°
17°
30
Hist. Avg.
33°
16°
31
Hist. Avg.
33°
16°
1
Hist. Avg.
33°
16°
2
Hist. Avg.
32°
16°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Monadnock State Park
Monadnock State Park's December 2026 forecast shows daily high temperatures ranging from 30° to 50°, with overnight lows between 13° and 33°. The average high for December is 37° with an average low of 20°. 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 Monadnock State Park. See also: January | February | March.
