S
M
T
W
T
F
S
29
36°
25°
30
37°
22°
1
35°
24°
2
34°
24°
3
38°
21°
4
34°
24°
5
32°
29°
6
36°
31°
7
39°
35°
8
47°
30°
9
48°
28°
10
40°
27°
11
37°
26°
12
35°
23°
13
34°
23°
14
32°
21°
15
30°
20°
16
29°
22°
17
30°
19°
18
32°
20°
19
32°
22°
20
34°
29°
21
37°
24°
22
38°
18°
23
35°
24°
24
33°
28°
25
39°
21°
26
38°
17°
27
35°
19°
28
29°
15°
29
32°
14°
30
26°
7°
31
33°
11°
1
25°
15°
2
31°
14°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Cortland
Cortland's December 2026 forecast shows daily high temperatures ranging from 25° to 48°, with overnight lows between 7° and 35°. The average high for December is 35° 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 Cortland. See also: January | February | March.
