Average Weather in Calgary Canada
In Calgary, the summers are comfortable; the winters are long, freezing, and dry; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 12°F to 75°F and is rarely below -13°F or above 86°F.
The warm season lasts for 3.3 months, from June 5 to September 15, with an average daily high temperature above 66°F. The hottest day of the year is August 5, with an average high of 75°F and low of 52°F.
The cold season lasts for 3.8 months, from November 16 to March 9, with an average daily high temperature below 38°F. The coldest day of the year is January 1, with an average low of 12°F and high of 29°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
In Calgary, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Calgary begins around June 24 and lasts for 3.4 months, ending around October 6. On July 29, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.
The cloudier part of the year begins around October 6 and lasts for 8.6 months, ending around June 24. On March 18, the cloudiest day of the year, the sky is overcast or mostly cloudy 64% of the time, and clear, mostly clear, or partly cloudy 36% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Calgary varies significantly throughout the year.
The wetter season lasts 4.5 months, from May 2 to September 18, with a greater than 19% chance of a given day being a wet day. The chance of a wet day peaks at 34% on June 17.
The drier season lasts 7.5 months, from September 18 to May 2. The smallest chance of a wet day is 3% on February 4.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation in Calgary changes throughout the year.
Rain alone is the most common for 7.0 months, from April 2 to November 1. The highest chance of a day with rain alone is 34% on June 17.
Snow alone is the most common for 5.0 months, from November 1 to April 2. The highest chance of a day with snow alone is 6% on November 20.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Calgary experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 6.1 months, from April 10 to October 12, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 14, with an average total accumulation of 2.9 inches.
The rainless period of the year lasts for 5.9 months, from October 12 to April 10. The least rain falls around January 27, with and average total accumulation of 0.0 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Calgary does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Calgary varies extremely over the course of the year. In 2017, the shortest day is December 21, with 7 hours, 54 minutes of daylight; the longest day is June 21, with 16 hours, 34 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:20 AM on June 17, and the latest sunrise is 3 hours, 19 minutes later at 8:39 AM on December 30. The earliest sunset is at 4:29 PM on December 12, and the latest sunset is 5 hours, 26 minutes later at 9:55 PM on June 24.
Daylight saving time (DST) is observed in Calgary during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The perceived humidity level in Calgary, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Calgary experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.1 months, from October 19 to May 21, with average wind speeds of more than 3.9 miles per hour. The windiest day of the year is December 25, with an average hourly wind speed of 4.7 miles per hour.
The calmer time of year lasts for 4.9 months, from May 21 to October 19. The calmest day of the year is August 3, with an average hourly wind speed of 3.1 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Calgary is from the west throughout the year.
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.7 months, from April 29 to August 20, with an average daily incident shortwave energy per square meter above 5.6 kWh. The brightest day of the year is July 6, with an average of 6.8 kWh.
The darker period of the year lasts for 3.5 months, from October 27 to February 14, with an average daily incident shortwave energy per square meter below 2.1 kWh. The darkest day of the year is December 24, with an average of 1.0 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Calgary are 51.050 deg latitude, -114.085 deg longitude, and 3,527 ft elevation.
The topography within 2 miles of Calgary contains only modest variations in elevation, with a maximum elevation change of 299 feet and an average elevation above sea level of 3,507 feet. Within 10 miles contains only modest variations in elevation (951 feet). Within 50 miles contains very significant variations in elevation (7,936 feet).
The area within 2 miles of Calgary is covered by artificial surfaces (99%), within 10 miles by cropland (42%) and artificial surfaces (41%), and within 50 miles by cropland (62%) and trees (19%).
This report illustrates the typical weather in Calgary, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Calgary.
For each station, the records are corrected for the elevation difference between that station and Calgary according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Calgary is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Calgary and a given station.
The stations contributing to this reconstruction are: Calgary International, Alta. (73%, 8 kilometers, northeast), Cop Upper (23%, 9 kilometers, west), Sparwood/Elk Valley Airport (2.3%, 80 kilometers, south), and Champion AGDM (1.8%, 101 kilometers, southeast).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.