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