December Weather in Calgary Canada
Daily high temperatures decrease by 4°F, from 33°F to 29°F, rarely falling below 2°F or exceeding 49°F.
Daily low temperatures decrease by 5°F, from 17°F to 12°F, rarely falling below -13°F or exceeding 32°F.
For reference, on August 5, the hottest day of the year, temperatures in Calgary typically range from 52°F to 75°F, while on January 1, the coldest day of the year, they range from 12°F to 29°F.
Average High and Low Temperature in December in Calgary
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, 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 December in Calgary
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The month of December in Calgary experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 60% throughout the month.
The clearest day of the month is December 2, with clear, mostly clear, or partly cloudy conditions 41% of the time.
For reference, on March 18, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 64%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 68%.
Cloud Cover Categories in December in Calgary
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Calgary, the chance of a wet day over the course of December is gradually decreasing, starting the month at 7% and ending it at 5%.
For reference, the year's highest daily chance of a wet day is 34% on June 17, and its lowest chance is 3% on February 4.
Probability of Precipitation in December in Calgary
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day snowfall during December in Calgary is gradually decreasing, starting the month at 2.3 inches, when it rarely exceeds 5.3 inches or falls below 0.2 inches, and ending the month at 1.8 inches, when it rarely exceeds 4.3 inches.
Average Monthly Snowfall in December in Calgary
Over the course of December in Calgary, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 16 minutes, implying an average daily decrease of 32 seconds, and weekly decrease of 3 minutes, 45 seconds.
The shortest day of the month is December 21, with 7 hours, 54 minutes of daylight and the longest day is December 1, with 8 hours, 15 minutes of daylight.
Hours of Daylight and Twilight in December in Calgary
The earliest sunrise of the month in Calgary is 8:17 AM on December 1 and the latest sunrise is 22 minutes later at 8:39 AM on December 31.
The earliest sunset is 4:29 PM on December 12 and the latest sunset is 10 minutes later at 4:39 PM on December 31.
Daylight saving time is observed in Calgary during 2023, but it neither starts nor ends during December, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:21 AM and sets 16 hours, 33 minutes later, at 9:54 PM, while on December 22, the shortest day of the year, it rises at 8:37 AM and sets 7 hours, 54 minutes later, at 4:32 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December in Calgary
The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.
Solar Elevation and Azimuth in December in Calgary
The figure below presents a compact representation of key lunar data for December 2023. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in December in Calgary
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 chance that a given day will be muggy in Calgary is essentially constant during December, remaining around 0% throughout.
For reference, on July 4, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in December in Calgary
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 is essentially constant during December, remaining within 0.2 miles per hour of 8.5 miles per hour throughout.
For reference, on December 25, the windiest day of the year, the daily average wind speed is 8.7 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 5.8 miles per hour.
The highest daily average wind speed during December is 8.7 miles per hour on December 25.
Average Wind Speed in December in Calgary
The hourly average wind direction in Calgary throughout December is predominantly from the west, with a peak proportion of 66% on December 12.
Wind Direction in December in Calgary
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season in Calgary typically lasts for 4.4 months (135 days), from around May 12 to around September 23, rarely starting before April 22 or after May 30, and rarely ending before September 5 or after October 13.
The month of December in Calgary is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in December in Calgary
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days in Calgary are essentially constant during December, remaining within 1°F of 1,472°F throughout.
Growing Degree Days in December in Calgary
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 in Calgary is essentially constant during December, remaining within 0.1 kWh of 1.0 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 1.0 kWh on December 24.
Average Daily Incident Shortwave Solar Energy in December in Calgary
For the purposes of this report, the geographical coordinates of Calgary are 51.050 deg latitude, -114.085 deg longitude, and 3,425 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:
To get a sense of how much these sources agree with each other, you can view a comparison of Calgary and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .
Maps are © OpenStreetMap contributors.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.
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