S
M
T
W
T
F
S
29
46°
37°
30
48°
35°
1
49°
35°
2
49°
34°
3
50°
21°
4
55°
20°
5
37°
20°
6
36°
21°
7
38°
22°
8
39°
19°
9
39°
17°
10
34°
17°
11
33°
20°
12
34°
19°
13
36°
20°
14
37°
22°
15
40°
24°
16
43°
23°
17
43°
28°
18
44°
31°
19
42°
30°
20
41°
28°
21
39°
28°
22
38°
26°
23
39°
23°
24
40°
19°
25
38°
25°
26
35°
23°
27
35°
17°
28
36°
20°
29
34°
23°
30
36°
18°
31
35°
24°
1
Hist. Avg.
38°
22°
2
Hist. Avg.
38°
22°
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 33° to 55°, with overnight lows between 17° and 37°. The average high for December is 40° with an average low of 24°. 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.
