S
M
T
W
T
F
S
29
62°
39°
30
61°
31°
1
47°
27°
2
48°
32°
3
56°
38°
4
58°
37°
5
48°
32°
6
47°
30°
7
46°
24°
8
44°
25°
9
46°
32°
10
50°
36°
11
53°
35°
12
58°
36°
13
52°
35°
14
48°
26°
15
47°
29°
16
47°
27°
17
46°
20°
18
42°
20°
19
44°
19°
20
40°
22°
21
45°
29°
22
45°
22°
23
44°
24°
24
49°
22°
25
44°
25°
26
51°
29°
27
55°
29°
28
50°
22°
29
45°
27°
30
44°
20°
31
44°
19°
1
42°
24°
2
44°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in McLean
McLean's December 2026 forecast shows daily high temperatures ranging from 40° to 62°, with overnight lows between 19° and 39°. The average high for December is 48° with an average low of 28°. 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 McLean. See also: January | February | March.
