S
M
T
W
T
F
S
29
45°
34°
30
45°
31°
1
44°
34°
2
46°
34°
3
48°
19°
4
51°
17°
5
34°
18°
6
32°
19°
7
34°
20°
8
35°
15°
9
35°
14°
10
29°
14°
11
29°
18°
12
31°
17°
13
32°
18°
14
33°
21°
15
36°
22°
16
39°
22°
17
38°
25°
18
40°
29°
19
40°
28°
20
39°
27°
21
37°
26°
22
36°
24°
23
37°
23°
24
36°
17°
25
37°
23°
26
35°
22°
27
35°
17°
28
34°
16°
29
33°
21°
30
34°
15°
31
31°
13°
1
Hist. Avg.
36°
20°
2
Hist. Avg.
36°
20°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Prospect
Prospect's December 2026 forecast shows daily high temperatures ranging from 29° to 51°, with overnight lows between 13° and 34°. The average high for December is 37° 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 Prospect. See also: January | February | March.
