S
M
T
W
T
F
S
29
46°
20°
30
42°
18°
1
41°
20°
2
44°
14°
3
43°
21°
4
44°
24°
5
51°
28°
6
51°
21°
7
42°
18°
8
42°
20°
9
43°
13°
10
38°
16°
11
39°
18°
12
48°
20°
13
44°
14°
14
37°
17°
15
42°
18°
16
43°
16°
17
41°
17°
18
45°
22°
19
44°
21°
20
48°
13°
21
38°
14°
22
36°
9°
23
36°
12°
24
35°
11°
25
39°
11°
26
45°
18°
27
42°
18°
28
Hist. Avg.
44°
13°
29
Hist. Avg.
44°
13°
30
Hist. Avg.
44°
13°
31
Hist. Avg.
44°
13°
1
Hist. Avg.
44°
13°
2
Hist. Avg.
44°
14°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Lyons
Lyons's December 2026 forecast shows daily high temperatures ranging from 35° to 51°, with overnight lows between 9° and 28°. The average high for December is 42° with an average low of 17°. 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.
