Calgary Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Calgary, Alberta during each month of the year.

The average high and low temperatures are listed below monthly and annually for the city, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 10, 20 or 30 °C each month in Calgary, scroll down farther. There are also monthly and yearly counts of days with frost and cold weather.

All the numbers are long-term historical averages based on climate data gathered from 1981 to 2010.

Average Calgary temperatures
High °F Low °F   High °C Low °C
30 8 January -1 -13
33 11 February 1 -11
40 18 March 4 -8
52 28 April 11 -2
61 38 May 16 3
68 45 June 20 7
74 50 July 23 10
73 48 August 23 9
64 39 September 18 4
53 29 October 12 -1
38 17 November 3 -8
30 9 December -1 -13
51 29 Year 11 -2

Days of Hot Weather in Calgary

Calgary's hottest temperatures of the year are usually in the low-thirties Celsius. A day that hot can show up as early as May or as late as September. Only very rarely does the temperature here climb above 35 degrees Celsius (95 °F).

Days per month in Calgary over 10, 20 or 30 °C
  10 °C
50 °F
20 °C
68 °F
30 °C
86 °F
January 3 0 0
February 4 0 0
March 8 0 0
April 18 3 0
May 26 9 0
June 29 15 0
July 31 24 2
August 30 22 2
September 26 12 1
October 19 3 0
November 6 0 0
December 2 0 0
Year 204 87 5

When Calgary Has Frosty Weather

Calgary typically has 194 days a year with a minimum temperature of 0 °C or below. The average date for the last frost in spring is May 21. Frost normally returns here on September 16. The frost-free period extends for 117 days on average between the final spring frost and the first fall frost.

Average number of days with freezing temperatures in Calgary
  0 °C
32 °F
January 30
February 27
March 29
April 21
May 6
June 0
July 0
August 0
September 4
October 19
November 28
December 30
Year 194

How Often Calgary Has Cold Temperatures

Calgary's chilliest winter nights have lows in the minus-thirties Celsius (below -22 °F). The city averages three or four nights a year which get that cold, mostly in January and December.

From October to May, Calgary can remain below freezing all day long. It usually has 59 days a year when the thermometer never rises above 0 °C.

Days per month on average in Calgary when the minimum temperature drops below -2, -10, or -20 °C
  -2 °C
28 °F
-10 °C
14 °F
-20 °C
-4 °F
January 29 18 7
February 26 14 5
March 26 8 2
April 14 1 0
May 2 0 0
June 0 0 0
July 0 0 0
August 0 0 0
September 1 0 0
October 12 1 0
November 25 10 2
December 29 18 6
Year 164 71 22
Reference

Environment Canada. Meteorological Service of Canada. Canadian Climate Normals. 1981-2010 Climate Normals & Averages.

Alberta Temperatures
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