S
M
T
W
T
F
S
29
29°
13°
30
28°
3°
1
31°
9°
2
28°
14°
3
31°
16°
4
32°
16°
5
36°
12°
6
36°
12°
7
30°
11°
8
30°
16°
9
37°
14°
10
36°
14°
11
32°
13°
12
35°
11°
13
32°
13°
14
29°
14°
15
30°
16°
16
34°
18°
17
37°
18°
18
37°
15°
19
39°
14°
20
36°
10°
21
30°
3°
22
26°
4°
23
25°
3°
24
25°
5°
25
27°
-4°
26
23°
-1°
27
16°
8°
28
23°
7°
29
27°
-6°
30
25°
-6°
31
16°
3°
1
20°
14°
2
29°
13°
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 39°, with overnight lows between -6° and 18°. 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.
