S
M
T
W
T
F
S
29
50°
36°
30
51°
35°
1
50°
31°
2
41°
30°
3
42°
29°
4
49°
32°
5
49°
33°
6
39°
26°
7
36°
22°
8
34°
20°
9
34°
22°
10
40°
26°
11
41°
28°
12
44°
26°
13
41°
26°
14
35°
21°
15
38°
23°
16
38°
27°
17
40°
24°
18
36°
18°
19
35°
15°
20
32°
14°
21
30°
15°
22
30°
20°
23
36°
22°
24
35°
22°
25
34°
13°
26
33°
11°
27
30°
12°
28
30°
12°
29
29°
17°
30
30°
18°
31
30°
12°
1
34°
8°
2
29°
8°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Riverton
Riverton's December 2026 forecast shows daily high temperatures ranging from 29° to 51°, with overnight lows between 8° and 36°. The average high for December is 37° 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 Riverton. See also: January | February | March.
