S
M
T
W
T
F
S
29
39°
20°
30
39°
20°
1
36°
19°
2
35°
19°
3
37°
18°
4
36°
18°
5
36°
17°
6
31°
17°
7
33°
18°
8
35°
18°
9
38°
17°
10
37°
18°
11
23°
13°
12
27°
13°
13
32°
15°
14
33°
17°
15
36°
17°
16
40°
18°
17
35°
14°
18
38°
13°
19
32°
8°
20
29°
9°
21
26°
10°
22
27°
0°
23
24°
0°
24
20°
4°
25
28°
7°
26
25°
9°
27
27°
-2°
28
25°
-3°
29
20°
0°
30
21°
-1°
31
22°
-5°
1
20°
-6°
2
16°
-2°
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 16° to 40°, with overnight lows between -6° and 20°. The average high for December is 30° with an average low of 10°. 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.
