S
M
T
W
T
F
S
29
54°
30°
30
53°
30°
1
55°
33°
2
61°
28°
3
57°
28°
4
52°
35°
5
57°
44°
6
65°
42°
7
65°
35°
8
64°
29°
9
55°
34°
10
58°
40°
11
56°
39°
12
56°
36°
13
52°
28°
14
50°
27°
15
48°
32°
16
51°
37°
17
50°
40°
18
55°
41°
19
60°
43°
20
63°
39°
21
65°
35°
22
63°
37°
23
51°
30°
24
52°
38°
25
59°
38°
26
60°
36°
27
56°
26°
28
55°
29°
29
48°
23°
30
46°
21°
31
44°
22°
1
43°
27°
2
50°
28°
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 43° to 65°, with overnight lows between 21° 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 Lanark. See also: January | February | March.
