Summer arrives in force in Upper Lachine, hotter than in 78% of Canadian towns
In January the night’s low is typically −13.5°C. Expect the most rain and snow in October and the least in February. By precipitation alone, it ranks wetter than 74% of Canadian towns. The heating season runs October to April: each of those months averages under 10°C.
1991–2020 normals from ECCC’s Montréal Trudeau (Airport) location, 10 km west.
A year in Upper Lachine at a glance
Each month’s typical high and low, in °C.
What stands out about Upper Lachine’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Upper Lachine feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
146 frost days and 121 days above 20°C a year
Frost comes from October to April; in January almost every night freezes. 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
On about 122 days a year, 1 mm or more falls.
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 Upper Lachine
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
The count adds up, day by day, how far the mean temperature falls short of 18°C. Over a year, a home here needs less heating than 62% of Canadian towns.
Living with Upper Lachine’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
The frost-free stretch runs from about 29 April to about 14 October, some 167 days in a normal year.
Afternoons of 17–27°C and nights of at least 8°C arrive in May, Jun, Jul, Aug and Sep.
Parks & trails →Winter brings about 40 days with a wind chill below −20.
About 50 days a year turn sultry, with the humidex past 30.
For blizzards, floods and wildfire, turn to Upper Lachine’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 | 10 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 Upper Lachine compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Quebec.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share Upper Lachine’s would only repeat its figures. The nearest place to Upper Lachine with figures is 12 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Upper Lachine Montréal Trudeau (Airport) | 26.7°C | −13.5°C | 1,041 mm |
| Brossard 12 km · L'Acadie | 26.6°C about the same | −13.6°C about the same | 1,041 mm |
Upper Lachine 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 |
From −26.9°C to 25.8°C: March’s coldest and warmest days since 1991
From one year to the next, January’s average typically shifts by 3.0°C around its normal of −9.2°C, the widest of any month, while June’s shifts by 1.1°C.
Where Upper Lachine’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for Montréal Trudeau (Airport), 1991–2020, chosen as the nearest location with a full temperature record.
- Comparisons: the towns and neighbourhoods of 2,500+ across Canada, each on its nearest normals location, without the city totals or the reserves.
- Not on this page: sunshine, absent from every 1991–2020 location, and an altitude correction, for want of the town’s own elevation.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Upper Lachine’s climate
How warm does Upper Lachine get in summer?
Peak warmth comes in July, at about 26.7°C by mid-afternoon.
How cold does Upper Lachine get in winter?
Lows sink to −13.5°C on an average January night.
How much rain and snow does Upper Lachine get?
Measured as water, a year brings 1,041 mm: 103 mm in October, the wettest month, and 66 mm in February, the driest.
How long does snow stay on the ground?
Roughly 101 days a year start with snow cover of 1 cm or more.
Are these figures for Upper Lachine itself?
Close to it: they are ECCC’s 1991–2020 normals for Montréal Trudeau (Airport), just outside Upper Lachine’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Upper Lachine →
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).