S
M
T
W
T
F
S
29
46°
27°
30
37°
26°
1
43°
27°
2
45°
26°
3
36°
25°
4
39°
25°
5
43°
26°
6
35°
26°
7
40°
25°
8
41°
24°
9
36°
25°
10
33°
23°
11
32°
21°
12
36°
22°
13
31°
22°
14
39°
23°
15
36°
23°
16
39°
24°
17
41°
23°
18
40°
23°
19
35°
22°
20
28°
22°
21
32°
21°
22
33°
21°
23
28°
19°
24
25°
20°
25
25°
18°
26
30°
19°
27
33°
11°
28
34°
9°
29
30°
9°
30
31°
2°
31
25°
0°
1
21°
5°
2
22°
3°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in O'Neill
O'Neill's December 2026 forecast shows daily high temperatures ranging from 21° to 46°, with overnight lows between -0° and 27°. The average high for December is 34° with an average low of 20°. 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 O'Neill. See also: January | February | March.
