S
M
T
W
T
F
S
29
42°
28°
30
43°
30°
1
44°
28°
2
42°
29°
3
44°
27°
4
42°
26°
5
42°
26°
6
41°
27°
7
42°
25°
8
34°
24°
9
33°
25°
10
35°
24°
11
35°
24°
12
34°
21°
13
35°
18°
14
35°
15°
15
31°
14°
16
29°
15°
17
31°
16°
18
31°
21°
19
32°
20°
20
36°
18°
21
34°
17°
22
33°
17°
23
31°
6°
24
31°
13°
25
25°
13°
26
27°
5°
27
26°
-1°
28
24°
4°
29
25°
-1°
30
25°
9°
31
26°
17°
1
35°
13°
2
35°
9°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Johnsburg
Johnsburg's December 2026 forecast shows daily high temperatures ranging from 24° to 44°, with overnight lows between -1° and 30°. The average high for December is 34° with an average low of 18°. 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 Johnsburg. See also: January | February | March.
