S
M
T
W
T
F
S
29
37°
18°
30
35°
17°
1
36°
28°
2
37°
29°
3
36°
28°
4
37°
22°
5
34°
19°
6
34°
19°
7
37°
21°
8
34°
20°
9
35°
19°
10
34°
21°
11
38°
21°
12
38°
22°
13
41°
25°
14
38°
25°
15
40°
21°
16
40°
24°
17
36°
21°
18
40°
24°
19
43°
26°
20
43°
21°
21
39°
23°
22
41°
25°
23
41°
22°
24
40°
27°
25
38°
21°
26
43°
14°
27
37°
14°
28
29°
24°
29
34°
17°
30
36°
25°
31
36°
25°
1
40°
24°
2
39°
21°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Harper
Harper's December 2026 forecast shows daily high temperatures ranging from 29° to 43°, with overnight lows between 14° and 29°. The average high for December is 38° with an average low of 22°. 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 Harper. See also: January | February | March.
