S
M
T
W
T
F
S
29
8°
0°
30
15°
2°
1
14°
2°
2
13°
-2°
3
10°
-1°
4
4°
-11°
5
4°
-12°
6
3°
-12°
7
4°
-13°
8
2°
-7°
9
7°
-2°
10
11°
-12°
11
16°
-13°
12
14°
-13°
13
4°
-12°
14
14°
-16°
15
9°
-9°
16
4°
-11°
17
4°
-16°
18
3°
-15°
19
0°
0°
20
8°
-15°
21
11°
-16°
22
11°
-18°
23
1°
-20°
24
0°
-20°
25
-4°
-21°
26
-5°
-16°
27
-2°
-17°
28
-2°
-3°
29
12°
0°
30
12°
-2°
31
11°
-3°
1
11°
-3°
2
12°
-15°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Glennallen
Glennallen's December 2026 forecast shows daily high temperatures ranging from -5° to 16°, with overnight lows between -21° and 2°. The average high for December is 7° 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 Glennallen. See also: January | February | March.
