S
M
T
W
T
F
S
29
36°
23°
30
36°
28°
1
38°
23°
2
37°
28°
3
39°
22°
4
51°
20°
5
48°
24°
6
32°
22°
7
33°
24°
8
34°
18°
9
33°
16°
10
32°
18°
11
29°
20°
12
31°
22°
13
33°
22°
14
32°
24°
15
32°
28°
16
36°
29°
17
36°
25°
18
37°
30°
19
39°
29°
20
38°
25°
21
36°
25°
22
33°
22°
23
33°
16°
24
32°
25°
25
33°
22°
26
34°
26°
27
31°
25°
28
34°
21°
29
34°
23°
30
34°
13°
31
31°
17°
1
28°
20°
2
Hist. Avg.
34°
20°
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 28° to 51°, with overnight lows between 13° and 30°. The average high for December is 35° with an average low of 23°. 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.
