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Average Weather at Montréal–Mirabel International Airport Canada

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.

Based on the tourism score, the best time of year to visit Montréal–Mirabel International Airport for warm-weather activities is from late June to late August.

Climate Summary

freezingcoldcoolwarmcoolcoldfreezingJanFebMarAprMayJunJulAugSepOctNovDec64%64%35%35%clearovercastprecipitation: 3.1 inprecipitation: 3.1 in1.8 in1.8 inmuggy: 14%muggy: 14%0%0%drydrytourism score: 5.9tourism score: 5.90.00.0
Click on each chart for more information.

Temperature

The warm season lasts for 4.0 months, from May 16 to September 17, 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 10, 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.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature at Montréal–Mirabel International AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfrigidfreezingfreezingcoldcoldcoolcomfortablevery coldvery coldfrigidfrigid
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Mayna, Russia (4,745 miles away) and Ufa, Russia (4,913 miles) are the far-away foreign places with temperatures most similar to Montréal–Mirabel International Airport (view comparison).

Clouds

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.

Cloud Cover Categories

Cloud Cover Categories at Montréal–Mirabel International AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 2964%Aug 2964%Jan 435%Jan 435%Jun 849%Jun 849%Oct 2150%Oct 2150%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

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 6.1 months, from April 10 to October 13, 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 5.9 months, from October 13 to April 10. 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.

Daily Chance of Precipitation

Daily Chance of Precipitation at Montréal–Mirabel International AirportsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 640%Jul 640%Feb 2224%Feb 2224%Nov 1430%Nov 1430%Jan 128%Jan 128%Apr 1032%Apr 1032%snowrainmixed
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

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 27, 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 27 to February 18. The least rain falls around January 25, with an average total accumulation of 0.4 inches.

Average Monthly Rainfall

Average Monthly Rainfall at Montréal–Mirabel International AirportrainJanFebMarAprMayJunJulAugSepOctNovDec0 in1 in2 in3 in4 in5 inJun 253.1 inJun 253.1 inJan 250.4 inJan 250.4 inSep 283.0 inSep 283.0 inDec 270.5 inDec 270.5 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

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 7.8 months, from October 2 to May 27, 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 4.2 months, from May 27 to October 2. The least snow falls around August 7, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Montréal–Mirabel International AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 in3.5 inDec 141.9 inDec 141.9 inAug 70.0 inAug 70.0 inOct 20.1 inOct 20.1 inMay 270.1 inMay 270.1 in
The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Sun

The length of the day at Montréal–Mirabel International Airport varies significantly over the course of the year. In 2019, 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.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Montréal–Mirabel International AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 9 minMar 2012 hr, 9 minMar 2015 hr, 43 minJun 2115 hr, 43 minJun 2112 hr, 11 minSep 2312 hr, 11 minSep 238 hr, 41 minDec 218 hr, 41 minDec 21nightnightday
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:05 AM on June 16, and the latest sunrise is 2 hours, 31 minutes later at 7:36 AM on November 2. 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 2019, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at Montréal–Mirabel International AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 165:05 AMJun 165:05 AM8:49 PMJun 268:49 PMJun 26Dec 104:11 PMDec 104:11 PM7:36 AMNov 27:36 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2019. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

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 3.4 months, from June 4 to September 16, 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.

Humidity Comfort Levels

Humidity Comfort Levels at Montréal–Mirabel International AirportmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 30%Dec 30%Jul 1114%Jul 1114%Jun 44%Jun 44%Sep 164%Sep 164%drydrycomfortablecomfortablemuggymuggyhumidhumid
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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 significant seasonal variation over the course of the year.

The windier part of the year lasts for 4.9 months, from December 6 to May 4, with average wind speeds of more than 7.6 miles per hour. The windiest day of the year is February 23, with an average hourly wind speed of 9.3 miles per hour.

The calmer time of year lasts for 7.1 months, from May 4 to December 6. The calmest day of the year is July 31, with an average hourly wind speed of 6.0 miles per hour.

Average Wind Speed

Average Wind Speed at Montréal–Mirabel International AirportwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mphFeb 239.3 mphFeb 239.3 mphJul 316.0 mphJul 316.0 mphDec 67.6 mphDec 67.6 mphMay 47.6 mphMay 47.6 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Montréal–Mirabel International Airport is from the west throughout the year.

Wind Direction

Wind Direction at Montréal–Mirabel International AirportJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westnortheastsouth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is at Montréal–Mirabel International Airport throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Montréal–Mirabel International Airport for general outdoor tourist activities is from late June to late August, with a peak score in the third week of July.

Tourism Score

Tourism Score at Montréal–Mirabel International Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468105.95.90.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Montréal–Mirabel International Airport for hot-weather activities is from early July to mid August, with a peak score in the last week of July.

Beach/Pool Score

Beach/Pool Score at Montréal–Mirabel International AirportJanFebMarAprMayJunJulAugSepOctNovDec02468103.43.40.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

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 at Montréal–Mirabel International Airport typically lasts for 4.1 months (124 days), from around June 4 to around October 6, rarely starting before May 8 or after June 24, and rarely ending before September 19 or after October 23.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Montréal–Mirabel International Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jun 450%Jun 450%Oct 650%Oct 650%Jun 2490%Jun 2490%Sep 1990%Sep 1990%May 810%May 810%Oct 2310%Oct 2310%Aug 8100%Aug 8100%frigidfreezingcoldcoolcomfortablevery cold
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 percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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.

Based on growing degree days alone, the first spring blooms at Montréal–Mirabel International Airport should appear around May 11, only rarely appearing before May 2 or after May 20.

Growing Degree Days

Growing Degree Days at Montréal–Mirabel International AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°FMay 1190°FMay 1190°FJul 20900°FJul 20900°FDec 311,746°FDec 311,746°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Montréal–Mirabel International AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJun 306.6 kWhJun 306.6 kWhDec 171.2 kWhDec 171.2 kWhMay 55.5 kWhMay 55.5 kWhAug 245.5 kWhAug 245.5 kWhOct 272.3 kWhOct 272.3 kWhFeb 112.3 kWhFeb 112.3 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

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%).

Data Sources

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, Montréal-Pierre Elliott Trudeau International Airport, Montreal / Pierre Elliott Trudeau International, 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.

Disclaimer

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.