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