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.
The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1981 to 2010 weather.
| High °F | Low °F | High °C | Low °C | |
|---|---|---|---|---|
| 32 | 12 | January | 0 | -11 |
| 29 | 9 | February | -2 | -13 |
| 39 | 19 | March | 4 | -7 |
| 51 | 29 | April | 10 | -2 |
| 62 | 39 | May | 17 | 4 |
| 69 | 47 | June | 20 | 8 |
| 75 | 52 | July | 24 | 11 |
| 74 | 50 | August | 23 | 10 |
| 64 | 42 | September | 18 | 5 |
| 53 | 31 | October | 11 | -1 |
| 38 | 18 | November | 3 | -8 |
| 30 | 11 | December | -1 | -12 |
| 51 | 30 | Year | 11 | -1 |
| 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).
| 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.
| 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.
| -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 |
References
Environment Canada. Meteorological Service of Canada. Canadian Climate Normals. 1981-2010 Climate Normals & Averages.
Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.