S
M
T
W
T
F
S
29
52°
40°
30
55°
40°
1
54°
39°
2
54°
34°
3
43°
33°
4
49°
32°
5
54°
38°
6
49°
36°
7
41°
27°
8
40°
24°
9
39°
23°
10
40°
29°
11
40°
34°
12
42°
29°
13
43°
26°
14
39°
23°
15
39°
28°
16
40°
30°
17
42°
31°
18
46°
29°
19
45°
23°
20
41°
22°
21
37°
22°
22
37°
24°
23
41°
28°
24
40°
26°
25
38°
21°
26
38°
18°
27
36°
20°
28
35°
20°
29
36°
21°
30
37°
24°
31
41°
21°
1
41°
18°
2
36°
15°
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 35° to 55°, with overnight lows between 15° and 40°. The average high for December is 42° with an average low of 27°. 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.
