S
M
T
W
T
F
S
29
50°
22°
30
46°
20°
1
45°
21°
2
48°
16°
3
47°
22°
4
48°
25°
5
55°
30°
6
55°
23°
7
46°
20°
8
46°
21°
9
47°
15°
10
42°
18°
11
42°
20°
12
52°
22°
13
48°
16°
14
41°
19°
15
45°
20°
16
47°
18°
17
45°
19°
18
49°
25°
19
48°
24°
20
51°
16°
21
42°
17°
22
40°
11°
23
40°
15°
24
39°
13°
25
43°
14°
26
49°
21°
27
41°
14°
28
49°
13°
29
42°
12°
30
Hist. Avg.
47°
18°
31
Hist. Avg.
47°
18°
1
Hist. Avg.
47°
18°
2
Hist. Avg.
48°
18°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Northglenn
Northglenn's December 2026 forecast shows daily high temperatures ranging from 39° to 55°, with overnight lows between 11° and 30°. The average high for December is 46° with an average low of 19°. 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 Northglenn. See also: January | February | March.
