S
M
T
W
T
F
S
29
50°
30°
30
45°
22°
1
35°
18°
2
35°
22°
3
41°
28°
4
40°
28°
5
40°
27°
6
38°
23°
7
34°
22°
8
33°
24°
9
41°
25°
10
45°
27°
11
45°
27°
12
47°
26°
13
46°
26°
14
38°
24°
15
39°
24°
16
39°
21°
17
38°
13°
18
36°
11°
19
37°
5°
20
28°
8°
21
28°
19°
22
37°
13°
23
38°
14°
24
37°
9°
25
35°
22°
26
38°
23°
27
39°
22°
28
38°
22°
29
38°
19°
30
37°
11°
31
34°
6°
1
30°
7°
2
28°
20°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Byron
Byron's December 2026 forecast shows daily high temperatures ranging from 28° to 50°, with overnight lows between 5° and 30°. The average high for December is 38° with an average low of 20°. 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 Byron. See also: January | February | March.
