Average Weather at Montréal–Mirabel International Airport Canada

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At Montréal–Mirabel International Airport, the summers are long and comfortable, the winters are frigid and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from -3°F to 77°F and is rarely below -23°F or above 85°F.

The warm season lasts for 4.1 months, from May 16 to September 18, with an average daily high temperature above 65°F. The hottest day of the year is July 20, with an average high of 77°F and low of 54°F.

The cold season lasts for 3.3 months, from December 1 to March 11, with an average daily high temperature below 30°F. The coldest day of the year is January 29, with an average low of -3°F and high of 19°F.

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.

At Montréal–Mirabel International Airport, 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 at Montréal–Mirabel International Airport begins around June 8 and lasts for 4.4 months, ending around October 21. On August 29, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 64% of the time, and overcast or mostly cloudy 36% of the time.

The cloudier part of the year begins around October 21 and lasts for 7.6 months, ending around June 8. On January 4, the cloudiest day of the year, the sky is overcast or mostly cloudy 65% of the time, and clear, mostly clear, or partly cloudy 35% 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 at Montréal–Mirabel International Airport varies throughout the year.

The wetter season lasts 6.0 months, from April 11 to October 12, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 40% on July 6.

The drier season lasts 6.0 months, from October 12 to April 11. The smallest chance of a wet day is 24% on February 22.

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 at Montréal–Mirabel International Airport changes throughout the year.

Rain alone is the most common for 7.8 months, from March 21 to November 14. The highest chance of a day with rain alone is 40% on July 6.

Snow alone is the most common for 4.2 months, from November 14 to March 21. The highest chance of a day with snow alone is 21% on January 3.

Rainfall

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. Montréal–Mirabel International Airport experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 10 months, from February 18 to December 26, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 25, with an average total accumulation of 3.1 inches.

The rainless period of the year lasts for 1.7 months, from December 26 to February 18. The least rain falls around January 25, with an average total accumulation of 0.4 inches.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Montréal–Mirabel International Airport experiences significant seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 7.7 months, from October 3 to May 26, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 14, with an average total liquid-equivalent accumulation of 1.9 inches.

The snowless period of the year lasts for 4.3 months, from May 26 to October 3. The least snow falls around August 7, with an average total liquid-equivalent accumulation of 0.0 inches.

The length of the day at Montréal–Mirabel International Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 41 minutes of daylight; the longest day is June 21, with 15 hours, 43 minutes of daylight.

The earliest sunrise is at 5:05 AM on June 15, and the latest sunrise is 2 hours, 35 minutes later at 7:40 AM on November 4. The earliest sunset is at 4:11 PM on December 10, and the latest sunset is 4 hours, 38 minutes later at 8:49 PM on June 26.

Daylight saving time (DST) is observed at Montréal–Mirabel International Airport during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

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.

Montréal–Mirabel International Airport experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.3 months, from June 5 to September 15, during which time the comfort level is muggy, oppressive, or miserable at least 4% of the time. The muggiest day of the year is July 11, with muggy conditions 14% of the time.

The least muggy day of the year is December 3, when muggy conditions are essentially unheard of.

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 at Montréal–Mirabel International Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.0 months, from December 5 to May 4, with average wind speeds of more than 4.1 miles per hour. The windiest day of the year is February 23, with an average hourly wind speed of 5.0 miles per hour.

The calmer time of year lasts for 7.0 months, from May 4 to December 5. The calmest day of the year is July 31, with an average hourly wind speed of 3.2 miles per hour.

The predominant average hourly wind direction at Montréal–Mirabel International Airport 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 3.6 months, from May 5 to August 24, with an average daily incident shortwave energy per square meter above 5.5 kWh. The brightest day of the year is June 30, with an average of 6.6 kWh.

The darker period of the year lasts for 3.4 months, from October 27 to February 11, with an average daily incident shortwave energy per square meter below 2.3 kWh. The darkest day of the year is December 17, with an average of 1.2 kWh.

For the purposes of this report, the geographical coordinates of Montréal–Mirabel International Airport are 45.682 deg latitude, -74.005 deg longitude, and 243 ft elevation.

The topography within 2 miles of Montréal–Mirabel International Airport is essentially flat, with a maximum elevation change of 62 feet and an average elevation above sea level of 248 feet. Within 10 miles is essentially flat (784 feet). Within 50 miles contains significant variations in elevation (3,159 feet).

The area within 2 miles of Montréal–Mirabel International Airport is covered by cropland (66%), trees (17%), and grassland (15%), within 10 miles by trees (46%) and cropland (35%), and within 50 miles by trees (53%) and cropland (31%).

This report illustrates the typical weather at Montréal–Mirabel International Airport, 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

Montréal–Mirabel International Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Ste Anne De Bell 1, Montreal / Pierre Elliott Trudeau International, Montréal-Pierre Elliott Trudeau International Airport, Valleyfield, Montreal-Est, Mc Tavish Automated Reporting Station, L'Assomption, and Nanakwa Shoals.

Other Data

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.