S
M
T
W
T
F
S
29
26°
1°
30
21°
7°
1
25°
5°
2
28°
4°
3
25°
14°
4
28°
18°
5
38°
18°
6
38°
17°
7
36°
10°
8
34°
7°
9
31°
8°
10
30°
15°
11
Hist. Avg.
28°
8°
12
Hist. Avg.
28°
7°
13
Hist. Avg.
28°
7°
14
Hist. Avg.
27°
7°
15
Hist. Avg.
27°
6°
16
Hist. Avg.
27°
6°
17
Hist. Avg.
26°
6°
18
Hist. Avg.
26°
6°
19
Hist. Avg.
26°
5°
20
Hist. Avg.
26°
5°
21
Hist. Avg.
25°
5°
22
Hist. Avg.
25°
5°
23
Hist. Avg.
25°
4°
24
Hist. Avg.
25°
4°
25
Hist. Avg.
25°
4°
26
Hist. Avg.
24°
4°
27
Hist. Avg.
24°
4°
28
Hist. Avg.
24°
4°
29
Hist. Avg.
24°
4°
30
Hist. Avg.
24°
3°
31
Hist. Avg.
24°
3°
1
Hist. Avg.
24°
3°
2
Hist. Avg.
24°
3°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Glen Ullin
Glen Ullin's December 2026 forecast shows daily high temperatures ranging from 21° to 38°, with overnight lows between 1° and 18°. The average high for December is 30° with an average low of 10°. 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 Glen Ullin. See also: January | February | March.
