S
M
T
W
T
F
S
29
40°
24°
30
42°
22°
1
43°
21°
2
40°
23°
3
43°
24°
4
43°
24°
5
42°
23°
6
43°
19°
7
39°
16°
8
37°
18°
9
36°
21°
10
38°
20°
11
37°
18°
12
37°
18°
13
36°
21°
14
36°
20°
15
41°
15°
16
37°
16°
17
34°
18°
18
36°
16°
19
37°
8°
20
30°
8°
21
30°
11°
22
31°
14°
23
31°
10°
24
32°
7°
25
29°
6°
26
28°
6°
27
27°
9°
28
32°
11°
29
33°
9°
30
33°
11°
31
32°
13°
1
30°
6°
2
37°
20°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Gillette
Gillette's December 2026 forecast shows daily high temperatures ranging from 27° to 43°, with overnight lows between 6° and 24°. The average high for December is 36° with an average low of 16°. 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 Gillette. See also: January | February | March.
