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