S
M
T
W
T
F
S
29
51°
37°
30
53°
36°
1
51°
32°
2
42°
31°
3
43°
30°
4
50°
33°
5
50°
34°
6
40°
27°
7
37°
23°
8
35°
21°
9
35°
23°
10
41°
27°
11
42°
29°
12
45°
28°
13
42°
27°
14
36°
22°
15
39°
24°
16
40°
28°
17
41°
25°
18
37°
19°
19
36°
16°
20
33°
15°
21
32°
16°
22
31°
21°
23
37°
23°
24
36°
23°
25
34°
13°
26
34°
12°
27
31°
12°
28
31°
13°
29
30°
18°
30
31°
19°
31
31°
13°
1
34°
8°
2
29°
8°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Assumption
Assumption's December 2026 forecast shows daily high temperatures ranging from 29° to 53°, with overnight lows between 8° and 37°. 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 Assumption. See also: January | February | March.
