S
M
T
W
T
F
S
29
32°
20°
30
31°
20°
1
32°
26°
2
36°
30°
3
41°
24°
4
39°
23°
5
35°
25°
6
35°
27°
7
34°
26°
8
34°
26°
9
35°
25°
10
36°
23°
11
32°
19°
12
31°
17°
13
32°
22°
14
36°
28°
15
36°
22°
16
38°
26°
17
32°
27°
18
38°
30°
19
40°
31°
20
38°
27°
21
38°
28°
22
37°
30°
23
38°
26°
24
38°
28°
25
34°
19°
26
37°
12°
27
30°
13°
28
22°
18°
29
25°
16°
30
32°
24°
31
28°
28°
1
35°
28°
2
36°
25°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Hartline
Hartline's December 2026 forecast shows daily high temperatures ranging from 22° to 41°, with overnight lows between 12° and 31°. The average high for December is 34° with an average low of 24°. 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 Hartline. See also: January | February | March.
