Summer afternoons in Lachine-Ouest are warmer than in 78% of Canadian towns
The depth of winter brings overnight lows near −13.5°C. Temperatures cover 40°C across the year, low to high. Rain and snow together come to more here than on 74% of Canadian towns. Homes need heating from October to April, the months averaging under 10°C.
Read at Montréal Trudeau (Airport), 4.8 km north-west: ECCC’s normals for 1991–2020.
A year in Lachine-Ouest at a glance
Each month’s typical high and low, in °C.
What stands out about Lachine-Ouest’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Lachine-Ouest feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
146 frost days and 121 days above 20°C a year
From October to April frost is routine, and in January it comes on almost every night. Some 12 nights a year drop under −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
The most falls in October, the least in February. 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
The snow season runs October to April; January brings the most, about 52 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Lachine-Ouest
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Degree days add up how far each day’s mean temperature falls below 18°C over a year. Homes here need less heating than 62% of Canadian towns.
Living with Lachine-Ouest’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Tender plants are usually safe from around 29 April until frost returns near 14 October: about 167 days.
Plan time outside for May, Jun, Jul, Aug and Sep: highs of 17–27°C and nights no colder than 8°C.
Parks & trails →Plan for about 40 days a year with a wind chill below −20.
On some 50 days a year the humidex climbs past 30.
Thirty-year normals hide the storms and the extremes: the hazards page has Lachine-Ouest’s risks.
Flood & hazards →ECCC’s normals location: Montréal Trudeau (Airport)
Behind the 1991–2020 normals for Montréal Trudeau (Airport) are 3 stations, which ECCC combines into one record.
| Distance from the town | 4.8 km north-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, 32 km |
How Lachine-Ouest 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
Nearby places read from a different ECCC location (places on Lachine-Ouest’s own would show the same figures). The one place listed is 16 km from Lachine-Ouest, the nearest with figures.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Lachine-Ouest Montréal Trudeau (Airport) | 26.7°C | −13.5°C | 1,041 mm |
| Candiac 16 km · L'Acadie | 26.6°C about the same | −13.6°C about the same | 1,041 mm |
Lachine-Ouest weather by month
Average daily high and low, mean temperature, rain and snow (as water) and snowfall by month, 1991–2020.
| 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 |
A March here can run from −26.9°C to 25.8°C
Bars run from each month’s record low to its record high over 1991–2020; January is the month whose average wanders most from year to year (±3.0°C around −9.2°C), June the one that wanders least (±1.1°C).
Where Lachine-Ouest’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 Lachine-Ouest’s climate
How warm does Lachine-Ouest get in summer?
On a normal day in July the thermometer climbs to 26.7°C, the warmest of the year.
How cold does Lachine-Ouest get in winter?
In January, the coldest month, the typical low is −13.5°C.
How much rain and snow does Lachine-Ouest get?
A normal year brings 1,041 mm, snow included as water: October is wettest at 103 mm, February driest at 66 mm.
How long does snow stay on the ground?
A layer of at least 1 cm stays down on about 101 days a year.
Are these figures for Lachine-Ouest itself?
Nearly: Montréal Trudeau (Airport), the location behind them, sits just beyond Lachine-Ouest’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Lachine-Ouest →
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).