Calgary Weather

Calgary experiences a humid continental climate within eastern parts of the city and a subarctic climate within western parts of the city due to an increase in elevation. The city has warm summers and freezing, dry, but like all of Alberta extremely variable winters. It falls into the NRC Plant Hardiness Zone 4a.
According to Environment Canada, average daily temperatures in Calgary range from 16.5 °C (61.7 °F) in July to −7.1 °C (19.2 °F) in January.

Winters are cold and the air temperature can drop to or below −20 °C (−4 °F) on average of 22 days of the year and −30 °C (−22 °F) on average of 3.7 days of the year, but are frequently broken up by warm, dry chinook winds that blow into Alberta over the mountains. These winds can raise the winter temperature by 20 °C (36 °F), and as much as 30 °C (54 °F) in just a few hours, and may last several days. As well, Calgary’s proximity to the Rocky Mountains affects winter temperatures with a mixture of lows and highs, and tends to result in a mild winter for a city in the Prairie Provinces. Temperatures are also affected by the wind chill factor; Calgary’s average wind speed is 14.2 km/h (8.8 mph), one of the highest in Canadian cities.

In summer, daytime temperatures range from 10 to 25 °C (50 to 77 °F) and exceed 30 °C (86 °F) an average of 5.1 days in June, July, and August, and occasionally as late as September or as early as May, and in winter drop below or at −30 °C (−22 °F) 3.7 days of the year. As a consequence of Calgary’s high elevation and aridity, summer evenings tend to cool off, with monthly average low temperatures below 10 °C (50 °F) throughout the summer months.

Calgary has the most sunny days year round of Canada’s 100 largest cities, with just over 332 days of sun; it has on average 2,396 hours of sunshine annually, with an average relative humidity of 55% in the winter and 45% in the summer (15:00 MST).

Calgary International Airport in the northeastern section of the city receives an average of 418.8 mm (16.49 in) of precipitation annually, with 326.4 mm (12.85 in) of that occurring in the form of rain, and 128.8 cm (50.7 in) as snow. The most rainfall occurs in June and the most snowfall in March. Calgary has also recorded snow every month of the year. It last snowed in July on July 15, 1999.

Thunderstorms can be frequent and sometimes severe with most of them occurring in the summer months. Calgary lies within Alberta’s Hailstorm Alley and is prone to damaging hailstorms every few years. A hailstorm that struck Calgary on September 7, 1991, was one of the most destructive natural disasters in Canadian history, with over $400 million in damage. Being west of the dry line on most occasions, tornadoes are rare in the region.

The highest temperature ever recorded in Calgary was 36.7 °C (98.1 °F) on August 10, 2018. The coldest temperature ever recorded was −45.0 °C (−49.0 °F) on February 4, 1893.

Average Temperature
Jan
32 °F
0 °C
Feb
1 °F
-17 °C
Mar
36 °F
2 °C
Apr
50 °F
10 °C
May
50 °F
10 °C
Jun
64 °F
18 °C
Jul
68 °F
20 °C
Aug
68 °F
20 °C
Sep
61 °F
16 °C
Oct
43 °F
6 °C
Nov
36 °F
2 °C
Dec
25 °F
-4 °C
Humidity
Jan
67%
Feb
60%
Mar
67%
Apr
52%
May
69%
Jun
68%
Jul
71%
Aug
70%
Sep
72%
Oct
66%
Nov
74%
Dec
74%
Rain
Jan
10mm
Feb
14mm
Mar
13mm
Apr
24mm
May
35mm
Jun
128mm
Jul
80mm
Aug
48mm
Sep
30mm
Oct
13mm
Nov
21mm
Dec
10mm
Clouds
Jan
50%
Feb
49%
Mar
28%
Apr
53%
May
52%
Jun
46%
Jul
30%
Aug
41%
Sep
55%
Oct
40%
Nov
57%
Dec
45%
Air quality US AQI
Jan
28
Feb
37
Mar
28
Apr
20
May
22
Jun
18
Jul
23
Aug
28
Sep
18
Oct
25
Nov
29
Dec
26
Sun
Jan
1UVI
Feb
1UVI
Mar
3UVI
Apr
4UVI
May
5UVI
Jun
6UVI
Jul
6UVI
Aug
6UVI
Sep
4UVI
Oct
2UVI
Nov
1UVI
Dec
0UVI