S
M
T
W
T
F
S
29
46°
29°
30
42°
23°
1
32°
14°
2
30°
14°
3
33°
27°
4
37°
27°
5
34°
26°
6
34°
20°
7
30°
17°
8
28°
20°
9
35°
20°
10
39°
25°
11
38°
25°
12
42°
24°
13
41°
25°
14
35°
22°
15
35°
22°
16
36°
20°
17
35°
13°
18
34°
11°
19
31°
7°
20
26°
6°
21
23°
19°
22
35°
19°
23
34°
13°
24
34°
6°
25
29°
19°
26
30°
21°
27
36°
20°
28
36°
18°
29
35°
14°
30
33°
13°
31
30°
3°
1
28°
2°
2
23°
13°
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 23° to 46°, with overnight lows between 2° and 29°. The average high for December is 34° with an average low of 18°. 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.
