S
M
T
W
T
F
S
29
42°
30°
30
42°
37°
1
52°
34°
2
52°
36°
3
45°
38°
4
53°
28°
5
54°
31°
6
39°
27°
7
40°
31°
8
41°
26°
9
42°
23°
10
38°
23°
11
34°
24°
12
35°
23°
13
36°
25°
14
37°
23°
15
36°
25°
16
36°
27°
17
37°
27°
18
37°
32°
19
39°
35°
20
42°
33°
21
41°
28°
22
40°
26°
23
36°
27°
24
37°
29°
25
36°
32°
26
42°
30°
27
40°
29°
28
39°
28°
29
37°
26°
30
37°
25°
31
32°
25°
1
32°
25°
2
Hist. Avg.
38°
25°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Winthrop
Winthrop's December 2026 forecast shows daily high temperatures ranging from 32° to 54°, with overnight lows between 23° and 38°. The average high for December is 40° with an average low of 28°. 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 Winthrop. See also: January | February | March.
