S
M
T
W
T
F
S
29
22°
11°
30
25°
18°
1
31°
20°
2
32°
19°
3
32°
19°
4
31°
18°
5
31°
19°
6
30°
18°
7
30°
17°
8
29°
17°
9
28°
16°
10
29°
16°
11
23°
6°
12
23°
5°
13
22°
6°
14
21°
8°
15
25°
10°
16
24°
8°
17
27°
8°
18
23°
9°
19
22°
8°
20
25°
8°
21
24°
9°
22
23°
5°
23
24°
0°
24
22°
-2°
25
11°
3°
26
18°
1°
27
13°
5°
28
14°
-2°
29
19°
-9°
30
15°
-10°
31
10°
2°
1
15°
-6°
2
16°
-5°
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 10° to 32°, with overnight lows between -10° and 20°. The average high for December is 23° with an average low of 8°. 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.
