S
M
T
W
T
F
S
29
47°
37°
30
49°
37°
1
45°
36°
2
43°
36°
3
41°
35°
4
41°
33°
5
40°
33°
6
41°
35°
7
40°
34°
8
38°
34°
9
39°
33°
10
43°
34°
11
43°
33°
12
37°
32°
13
35°
27°
14
31°
27°
15
33°
31°
16
35°
31°
17
43°
34°
18
44°
31°
19
41°
31°
20
38°
28°
21
33°
25°
22
35°
30°
23
38°
29°
24
40°
28°
25
29°
17°
26
29°
21°
27
32°
24°
28
34°
22°
29
32°
22°
30
33°
23°
31
32°
15°
1
29°
13°
2
26°
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 26° to 49°, with overnight lows between 13° and 37°. The average high for December is 37° with an average low of 29°. 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.
