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