S
M
T
W
T
F
S
29
42°
17°
30
41°
17°
1
41°
14°
2
39°
14°
3
38°
15°
4
39°
21°
5
42°
20°
6
46°
27°
7
47°
20°
8
40°
18°
9
39°
21°
10
45°
21°
11
43°
13°
12
Hist. Avg.
44°
17°
13
Hist. Avg.
44°
16°
14
Hist. Avg.
44°
16°
15
Hist. Avg.
44°
16°
16
Hist. Avg.
44°
16°
17
Hist. Avg.
44°
16°
18
Hist. Avg.
44°
16°
19
Hist. Avg.
44°
16°
20
Hist. Avg.
44°
16°
21
Hist. Avg.
44°
16°
22
Hist. Avg.
44°
16°
23
Hist. Avg.
44°
16°
24
Hist. Avg.
44°
16°
25
Hist. Avg.
44°
16°
26
Hist. Avg.
44°
16°
27
Hist. Avg.
45°
16°
28
Hist. Avg.
45°
16°
29
Hist. Avg.
45°
16°
30
Hist. Avg.
45°
16°
31
Hist. Avg.
45°
16°
1
Hist. Avg.
45°
16°
2
Hist. Avg.
45°
16°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Greeley
Greeley's December 2026 forecast shows daily high temperatures ranging from 38° to 47°, with overnight lows between 13° and 27°. The average high for December is 42° with an average low of 18°. 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 Greeley. See also: January | February | March.
