S
M
T
W
T
F
S
29
50°
24°
30
48°
21°
1
36°
23°
2
36°
26°
3
43°
28°
4
45°
33°
5
46°
34°
6
46°
33°
7
47°
31°
8
46°
28°
9
42°
28°
10
41°
21°
11
37°
17°
12
33°
21°
13
34°
19°
14
31°
18°
15
32°
19°
16
33°
15°
17
30°
16°
18
29°
23°
19
35°
25°
20
39°
27°
21
41°
28°
22
40°
21°
23
40°
16°
24
34°
13°
25
27°
17°
26
28°
21°
27
32°
22°
28
40°
16°
29
35°
17°
30
31°
16°
31
30°
23°
1
34°
22°
2
37°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Flossmoor
Flossmoor's December 2026 forecast shows daily high temperatures ranging from 27° to 50°, 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 Flossmoor. See also: January | February | March.
