S
M
T
W
T
F
S
29
52°
28°
30
56°
24°
1
51°
23°
2
43°
24°
3
47°
26°
4
50°
28°
5
52°
32°
6
54°
34°
7
55°
36°
8
58°
32°
9
58°
31°
10
54°
31°
11
51°
23°
12
49°
22°
13
42°
24°
14
44°
21°
15
43°
20°
16
41°
17°
17
40°
18°
18
38°
18°
19
39°
17°
20
39°
21°
21
42°
29°
22
48°
30°
23
53°
27°
24
51°
22°
25
45°
13°
26
41°
12°
27
38°
23°
28
38°
18°
29
46°
13°
30
37°
12°
31
33°
16°
1
36°
22°
2
41°
18°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Rosemont
Rosemont's December 2026 forecast shows daily high temperatures ranging from 33° to 58°, with overnight lows between 12° and 36°. The average high for December is 46° with an average low of 23°. 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 Rosemont. See also: January | February | March.
