S
M
T
W
T
F
S
29
25°
10°
30
27°
15°
1
23°
12°
2
24°
11°
3
26°
8°
4
22°
14°
5
24°
14°
6
28°
13°
7
25°
15°
8
22°
11°
9
24°
7°
10
23°
15°
11
33°
18°
12
33°
18°
13
36°
17°
14
33°
18°
15
36°
17°
16
34°
16°
17
30°
11°
18
24°
2°
19
23°
4°
20
23°
7°
21
31°
5°
22
26°
7°
23
21°
9°
24
27°
10°
25
32°
15°
26
36°
14°
27
36°
15°
28
35°
13°
29
34°
11°
30
29°
0°
31
26°
6°
1
21°
14°
2
30°
7°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Calgary
Calgary's December 2026 forecast shows daily high temperatures ranging from 21° to 36°, with overnight lows between -0° and 18°. The average high for December is 28° with an average low of 11°. 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 Calgary. See also: January | February | March.
