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