S
M
T
W
T
F
S
29
0°
-15°
30
1°
-12°
1
3°
-14°
2
2°
-14°
3
1°
-16°
4
-1°
-16°
5
-2°
-15°
6
2°
-15°
7
0°
-18°
8
-2°
-18°
9
-3°
-3°
10
12°
3°
11
20°
4°
12
21°
2°
13
19°
-1°
14
19°
1°
15
15°
2°
16
14°
4°
17
19°
1°
18
18°
-2°
19
18°
-15°
20
14°
-20°
21
1°
-20°
22
-2°
-17°
23
-3°
-8°
24
6°
-9°
25
13°
-17°
26
6°
-19°
27
-2°
-19°
28
-3°
-17°
29
-3°
-6°
30
4°
-5°
31
8°
-4°
1
9°
-2°
2
16°
-3°
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 -3° to 21°, with overnight lows between -20° and 4°. The average high for December is 7° with an average low of -9°. 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.
