Photo: Veillg1 · CC BY-SA 4.0Saint-Lambert has warmer summer afternoons than 78% of Canadian towns
Nights in January average −13.5°C. Rain and snow together come to more here than on 74% of Canadian towns. October is the wettest month, February the driest. Windshields need scraping on about 146 mornings a year, the days the air reaches 0°C or below.
The nearest ECCC normals location to Saint-Lambert is Montréal Trudeau (Airport), 19 km west, and every figure on this page is its.
A year in Saint-Lambert at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Lambert’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Lambert feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
Frost on 146 days, 20°C on 121
The frost season runs October to April, and January freezes nearly 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
Rain and melted snow: about 1,041 mm a year
Some 122 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 217 cm of snow a 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 Saint-Lambert
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Each day the mean sits under 18°C adds its shortfall; a year’s total is its heating degree days. Over a year, a home here needs less heating than 62% of Canadian towns.
Living with Saint-Lambert’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Count on about 167 frost-free days: the last frost averages 29 April, the first 14 October.
For long days outdoors, May, Jun, Jul, Aug and Sep bring 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.
Plan shade and water for about 50 days a year above 30 on the humidex.
A normal year has no blizzard, flood or heat wave in it; Saint-Lambert’s hazards page looks at those.
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 | 19 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, 26 km |
How Saint-Lambert 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
Nearby places read from a different ECCC location (places on Saint-Lambert’s own would show the same figures). The nearest places to Saint-Lambert with figures are 5–13 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Lambert Montréal Trudeau (Airport) | 26.7°C | −13.5°C | 1,041 mm |
| Brossard 5.5 km · L'Acadie | 26.6°C about the same | −13.6°C about the same | 1,041 mm |
| Boucherville 12 km · L'Assomption | 26.6°C about the same | −16.0°C 2.5°C colder | 1,041 mm |
Saint-Lambert weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and 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 |
March: −26.9°C at its coldest, 25.8°C at its warmest
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 Saint-Lambert’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 Canadian Climate Normals at Montréal Trudeau (Airport), the closest ECCC location with twelve months of temperature normals.
- Comparisons: a pool of Canadian towns and neighbourhoods of 2,500 or more, read alike; whole cities and reserves stay out of it.
- Not on this page: sunshine, not in ECCC’s 1991–2020 normals, and the effect of the town’s height, for which there is no figure.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Saint-Lambert’s climate
How warm does Saint-Lambert get in summer?
Summer peaks in July: a typical afternoon reaches 26.7°C.
How cold does Saint-Lambert get in winter?
On a normal January night the air drops to −13.5°C, the coldest of the year.
How much rain and snow does Saint-Lambert get?
The year adds up to 1,041 mm. October is the peak month (103 mm) and February the low one (66 mm).
How long does snow stay on the ground?
Snow cover of 1 cm or more lasts about 101 days in a typical year.
Are these figures for Saint-Lambert itself?
Not as such: Montréal Trudeau (Airport) is the nearest normals location, and Saint-Lambert has none.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Lambert →
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).