Photo: abdallahh · CC BY 2.0Summer arrives in force in Westmount, hotter than in 78% of Canadian towns
Midwinter brings lows of about −13.5°C. Rain and snow together come to more here than on 74% of Canadian towns. Temperatures cover 40°C across the year, low to high. Heating does most of its work from October to April, in months below 10°C on average.
The nearest ECCC normals location to Westmount is Montréal Trudeau (Airport), 12 km west, and every figure on this page is its.
A year in Westmount at a glance
Each month’s typical high and low, in °C.
What stands out about Westmount’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Westmount feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 146 frosts and 121 warm days a year
From October to April frost is routine, and in January it comes on almost every night. On about 12 nights a year the air falls below −20°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 1,041 mm of rain and snow a year
October brings the most rain and snow; February, the least. About 122 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 217 cm in a normal year
From October to April snow is likely; January is the peak, at about 52 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Westmount
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Heating degree days total each day’s gap between its mean temperature and 18°C. Homes here need less heating than 62% of Canadian towns.
Living with Westmount’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
The growing season between frosts lasts about 167 days, roughly 29 April to 14 October.
The outdoor season by the averages is May, Jun, Jul, Aug and Sep, with highs of 17–27°C and lows of 8°C or more.
Parks & trails →A wind chill below −20 is part of about 40 days a year here.
Expect around 50 sticky days a year with the humidex above 30.
Extremes don’t show in averages: floods, wildfire smoke and ice storms are on Westmount’s hazards page.
Flood & hazards →ECCC’s normals location: Montréal Trudeau (Airport)
Montréal Trudeau (Airport) is a composite: ECCC joins 3 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 12 km west |
| Station altitude | 36 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −31.8°C |
| Hottest reading, 1991–2020 | 36.6°C |
| Average wind | 15.4 km/h on average, most often from the west |
| Next-nearest location | L'Acadie, 29 km |
How Westmount compares
Against the 2,611 Canadian towns and neighbourhoods of 2,500 or more, each read from its own normals location; the dots are the other locations those towns use in Quebec.
Nearby towns’ climate
Places around Westmount whose figures come from another normals location. Distances here run 11–18 km: that is how far the nearest places with figures are from Westmount.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Westmount Montréal Trudeau (Airport) | 26.7°C | −13.5°C | 1,041 mm |
| Brossard 11 km · L'Acadie | 26.6°C about the same | −13.6°C about the same | 1,041 mm |
| Boucherville 18 km · L'Assomption | 26.6°C about the same | −16.0°C 2.5°C colder | 1,041 mm |
Westmount weather by month
Month by month, 1991–2020: the usual high, low and mean, the rain and snow, and the snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −5.0°C | −13.5°C | −9.2°C | 86 mm | 52 cm |
| February | −3.4°C | −12.4°C | −8.0°C | 66 mm | 47 cm |
| March | 2.4°C | −6.5°C | −2.0°C | 77 mm | 37 cm |
| April | 11.3°C | 1.1°C | 6.2°C | 90 mm | 15 cm |
| May | 19.4°C | 8.3°C | 13.9°C | 86 mm | 0 cm |
| June | 24.2°C | 13.8°C | 19.0°C | 84 mm | 0 cm |
| July | 26.7°C | 16.7°C | 21.7°C | 91 mm | 0 cm |
| August | 25.7°C | 15.6°C | 20.6°C | 94 mm | 0 cm |
| September | 21.1°C | 10.9°C | 16.0°C | 89 mm | 0 cm |
| October | 13.2°C | 4.5°C | 8.9°C | 103 mm | 1 cm |
| November | 6.1°C | −1.7°C | 2.3°C | 84 mm | 16 cm |
| December | −1.2°C | −8.7°C | −5.0°C | 92 mm | 48 cm |
| Year | 11.7°C | 2.3°C | 7.0°C | 1,041 mm | 217 cm |
Two years in three, January’s average lands within 3.0°C of normal, against the steadier June
Each bar spans a month’s coldest and warmest readings over thirty years; March’s run from −26.9°C in 1992 to 25.8°C in 2012.
Where Westmount’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Montréal Trudeau (Airport), the nearest location with a full year of temperatures.
- Comparisons: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest location.
- Not on this page: a sunshine figure (ECCC published none for 1991–2020) and any lapse-rate correction for height, as the town has no elevation here.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Westmount’s climate
How warm does Westmount get in summer?
Midsummer means July, with afternoons near 26.7°C on a typical day.
How cold does Westmount get in winter?
Lows sink to −13.5°C on an average January night.
How much rain and snow does Westmount get?
The yearly total is about 1,041 mm. October gets 103 mm, the most of any month; February gets 66 mm, the least.
How long does snow stay on the ground?
The ground is white, with 1 cm or more, on some 101 days a year.
Are these figures for Westmount itself?
They are the closest available: the normals for Montréal Trudeau (Airport), since Westmount has none.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Westmount →
Adapted from Statistics Canada (Census of Population 2021, population estimates 2025, 2021 census boundaries) under the Statistics Canada Open Licence; this does not constitute an endorsement by Statistics Canada. Neighbourhood names in some cities © OpenStreetMap contributors (ODbL).