S
M
T
W
T
F
S
29
50°
39°
30
54°
43°
1
55°
44°
2
54°
43°
3
56°
41°
4
51°
39°
5
53°
35°
6
51°
40°
7
54°
39°
8
46°
35°
9
44°
32°
10
43°
31°
11
41°
36°
12
43°
35°
13
46°
32°
14
42°
30°
15
43°
31°
16
44°
32°
17
43°
33°
18
42°
37°
19
50°
35°
20
49°
26°
21
42°
27°
22
39°
28°
23
37°
32°
24
41°
30°
25
46°
29°
26
49°
21°
27
39°
21°
28
35°
24°
29
38°
23°
30
37°
32°
31
42°
32°
1
51°
25°
2
47°
23°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Roslyn
Roslyn's December 2026 forecast shows daily high temperatures ranging from 35° to 56°, with overnight lows between 21° and 44°. The average high for December is 46° with an average low of 32°. 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 Roslyn. See also: January | February | March.
