S
M
T
W
T
F
S
29
43°
30°
30
43°
30°
1
44°
37°
2
48°
40°
3
48°
37°
4
46°
35°
5
47°
32°
6
49°
31°
7
48°
33°
8
48°
37°
9
49°
36°
10
48°
31°
11
48°
30°
12
47°
31°
13
49°
37°
14
46°
35°
15
50°
33°
16
49°
39°
17
48°
40°
18
49°
37°
19
50°
36°
20
48°
37°
21
47°
39°
22
48°
37°
23
49°
34°
24
47°
30°
25
45°
27°
26
46°
27°
27
40°
26°
28
39°
29°
29
40°
25°
30
41°
30°
31
42°
38°
1
47°
33°
2
48°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Startup
Startup's December 2026 forecast shows daily high temperatures ranging from 39° to 50°, with overnight lows between 25° and 40°. The average high for December is 46° 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 Startup. See also: January | February | March.
