S
M
T
W
T
F
S
29
45°
33°
30
46°
33°
1
45°
32°
2
45°
32°
3
43°
31°
4
45°
31°
5
43°
30°
6
38°
27°
7
35°
23°
8
32°
20°
9
32°
24°
10
37°
28°
11
38°
29°
12
41°
28°
13
36°
28°
14
31°
24°
15
34°
24°
16
37°
25°
17
38°
26°
18
35°
23°
19
36°
21°
20
32°
15°
21
32°
16°
22
27°
20°
23
36°
24°
24
34°
22°
25
35°
12°
26
32°
12°
27
26°
10°
28
26°
10°
29
27°
15°
30
26°
21°
31
28°
15°
1
34°
10°
2
25°
9°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Lyons
Lyons's December 2026 forecast shows daily high temperatures ranging from 25° to 46°, with overnight lows between 9° and 33°. The average high for December is 35° 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 Lyons. See also: January | February | March.
