S
M
T
W
T
F
S
29
46°
35°
30
48°
35°
1
47°
36°
2
48°
34°
3
48°
28°
4
41°
24°
5
47°
31°
6
48°
32°
7
39°
28°
8
35°
23°
9
34°
21°
10
34°
21°
11
33°
28°
12
33°
27°
13
34°
26°
14
31°
17°
15
32°
21°
16
33°
24°
17
35°
27°
18
34°
25°
19
39°
22°
20
35°
15°
21
33°
15°
22
30°
17°
23
28°
21°
24
30°
20°
25
33°
21°
26
31°
15°
27
30°
12°
28
28°
8°
29
26°
9°
30
28°
24°
31
35°
18°
1
39°
14°
2
28°
11°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in McHenry
McHenry's December 2026 forecast shows daily high temperatures ranging from 26° to 48°, with overnight lows between 8° and 36°. The average high for December is 36° with an average low of 22°. 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 McHenry. See also: January | February | March.
