S
M
T
W
T
F
S
29
70°
51°
30
68°
52°
1
67°
48°
2
62°
40°
3
58°
38°
4
59°
40°
5
64°
47°
6
62°
41°
7
56°
39°
8
55°
39°
9
56°
38°
10
55°
37°
11
56°
37°
12
58°
38°
13
60°
38°
14
59°
42°
15
60°
47°
16
65°
40°
17
66°
43°
18
65°
38°
19
59°
34°
20
55°
33°
21
55°
35°
22
57°
37°
23
58°
37°
24
55°
35°
25
56°
34°
26
56°
34°
27
55°
33°
28
57°
35°
29
58°
42°
30
59°
37°
31
59°
34°
1
54°
32°
2
53°
34°
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 53° to 70°, with overnight lows between 32° and 52°. The average high for December is 59° with an average low of 39°. 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.
