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