S
M
T
W
T
F
S
29
43°
34°
30
48°
29°
1
44°
24°
2
41°
31°
3
42°
29°
4
49°
26°
5
41°
28°
6
46°
37°
7
49°
33°
8
51°
28°
9
48°
28°
10
41°
29°
11
44°
33°
12
46°
32°
13
45°
31°
14
44°
33°
15
43°
31°
16
49°
26°
17
49°
26°
18
39°
24°
19
40°
22°
20
39°
29°
21
41°
32°
22
46°
31°
23
45°
32°
24
46°
30°
25
45°
27°
26
41°
21°
27
36°
22°
28
37°
25°
29
38°
23°
30
37°
17°
31
36°
28°
1
44°
12°
2
49°
11°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Mifflin
Mifflin's December 2026 forecast shows daily high temperatures ranging from 36° to 51°, with overnight lows between 11° and 37°. The average high for December is 43° with an average low of 27°. 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 Mifflin. See also: January | February | March.
