S
M
T
W
T
F
S
29
50°
38°
30
46°
38°
1
58°
32°
2
50°
37°
3
51°
27°
4
61°
26°
5
53°
26°
6
42°
25°
7
45°
29°
8
46°
25°
9
45°
23°
10
43°
23°
11
40°
24°
12
40°
25°
13
42°
24°
14
42°
25°
15
43°
26°
16
43°
26°
17
44°
27°
18
43°
36°
19
47°
33°
20
47°
32°
21
43°
27°
22
42°
25°
23
42°
27°
24
43°
26°
25
40°
23°
26
39°
27°
27
39°
25°
28
41°
24°
29
40°
23°
30
38°
22°
31
Hist. Avg.
46°
32°
1
Hist. Avg.
46°
32°
2
Hist. Avg.
45°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in McLean
McLean's December 2026 forecast shows daily high temperatures ranging from 38° to 61°, with overnight lows between 22° and 38°. The average high for December is 45° with an average low of 27°. 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.
