S
M
T
W
T
F
S
29
48°
31°
30
48°
30°
1
41°
27°
2
42°
29°
3
39°
29°
4
39°
25°
5
38°
26°
6
40°
28°
7
39°
27°
8
38°
27°
9
39°
28°
10
42°
27°
11
40°
26°
12
37°
25°
13
34°
23°
14
31°
23°
15
35°
25°
16
34°
25°
17
40°
26°
18
42°
24°
19
40°
24°
20
35°
23°
21
32°
22°
22
34°
24°
23
39°
23°
24
35°
23°
25
26°
10°
26
28°
16°
27
31°
18°
28
32°
15°
29
33°
19°
30
32°
11°
31
32°
7°
1
26°
6°
2
24°
7°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Lanark
Lanark's December 2026 forecast shows daily high temperatures ranging from 24° to 48°, with overnight lows between 6° and 31°. The average high for December is 36° with an average low of 22°. 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 Lanark. See also: January | February | March.
