S
M
T
W
T
F
S
29
40°
27°
30
38°
25°
1
29°
24°
2
31°
21°
3
32°
24°
4
37°
25°
5
33°
23°
6
31°
19°
7
23°
12°
8
23°
15°
9
28°
19°
10
35°
22°
11
35°
22°
12
34°
21°
13
33°
19°
14
20°
20°
15
30°
17°
16
32°
16°
17
28°
17°
18
29°
16°
19
28°
10°
20
25°
5°
21
22°
16°
22
28°
13°
23
29°
16°
24
27°
10°
25
29°
10°
26
24°
15°
27
25°
17°
28
30°
15°
29
30°
12°
30
27°
8°
31
26°
0°
1
25°
-3°
2
14°
3°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Clear Lake
Clear Lake's December 2026 forecast shows daily high temperatures ranging from 14° to 40°, with overnight lows between -3° and 27°. The average high for December is 29° with an average low of 16°. 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 Clear Lake. See also: January | February | March.
