S
M
T
W
T
F
S
29
43°
30°
30
44°
31°
1
43°
30°
2
42°
31°
3
45°
29°
4
43°
29°
5
43°
28°
6
42°
29°
7
42°
27°
8
34°
26°
9
35°
27°
10
39°
27°
11
38°
26°
12
37°
25°
13
37°
22°
14
35°
16°
15
31°
16°
16
28°
15°
17
31°
19°
18
31°
23°
19
33°
22°
20
37°
21°
21
36°
21°
22
33°
19°
23
34°
11°
24
31°
17°
25
24°
15°
26
27°
6°
27
26°
5°
28
26°
7°
29
27°
6°
30
28°
15°
31
28°
18°
1
35°
14°
2
34°
10°
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 24° to 45°, with overnight lows between 5° and 31°. The average high for December is 35° with an average low of 20°. 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.
