S
M
T
W
T
F
S
29
54°
35°
30
52°
31°
1
55°
32°
2
54°
31°
3
56°
29°
4
52°
30°
5
53°
33°
6
59°
44°
7
63°
41°
8
66°
34°
9
65°
31°
10
54°
30°
11
55°
33°
12
56°
36°
13
55°
37°
14
50°
29°
15
51°
28°
16
50°
28°
17
50°
29°
18
51°
33°
19
51°
38°
20
50°
43°
21
61°
41°
22
63°
38°
23
62°
41°
24
63°
39°
25
64°
38°
26
61°
38°
27
59°
31°
28
56°
29°
29
50°
30°
30
51°
23°
31
52°
22°
1
43°
24°
2
47°
24°
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 43° to 66°, with overnight lows between 22° and 44°. The average high for December is 55° with an average low of 33°. 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.
