S
M
T
W
T
F
S
29
52°
23°
30
53°
20°
1
47°
19°
2
33°
19°
3
32°
20°
4
35°
31°
5
38°
30°
6
45°
24°
7
39°
22°
8
36°
28°
9
36°
25°
10
39°
22°
11
36°
23°
12
33°
18°
13
36°
17°
14
30°
16°
15
29°
15°
16
Hist. Avg.
37°
21°
17
Hist. Avg.
37°
21°
18
Hist. Avg.
37°
21°
19
Hist. Avg.
36°
21°
20
Hist. Avg.
36°
21°
21
Hist. Avg.
36°
21°
22
Hist. Avg.
36°
20°
23
Hist. Avg.
35°
20°
24
Hist. Avg.
35°
20°
25
Hist. Avg.
35°
20°
26
Hist. Avg.
35°
20°
27
Hist. Avg.
34°
20°
28
Hist. Avg.
34°
19°
29
Hist. Avg.
34°
19°
30
Hist. Avg.
34°
19°
31
Hist. Avg.
34°
19°
1
Hist. Avg.
33°
19°
2
Hist. Avg.
33°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in McHenry
McHenry's December 2026 forecast shows daily high temperatures ranging from 29° to 53°, with overnight lows between 15° and 31°. The average high for December is 38° 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.
