S
M
T
W
T
F
S
29
41°
29°
30
45°
27°
1
43°
28°
2
44°
30°
3
47°
24°
4
43°
29°
5
45°
30°
6
46°
31°
7
47°
25°
8
48°
22°
9
40°
24°
10
39°
24°
11
41°
27°
12
40°
27°
13
38°
26°
14
41°
29°
15
44°
23°
16
46°
20°
17
38°
24°
18
37°
19°
19
35°
21°
20
36°
26°
21
39°
25°
22
40°
26°
23
42°
25°
24
41°
25°
25
37°
21°
26
38°
23°
27
37°
24°
28
39°
23°
29
38°
18°
30
37°
22°
31
37°
8°
1
39°
7°
2
38°
7°
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 35° to 48°, with overnight lows between 7° and 31°. The average high for December is 41° 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.
