July in Saint-Joseph-du-Lac runs hotter than in 78% of Canadian towns
January mornings start at about −13.5°C. Seasons differ by 40°C, from the coldest nights to the warmest afternoons. By precipitation alone, it ranks wetter than 74% of Canadian towns. Picnics, hikes and garden evenings come into their own from May to September, with highs of 19–27°C.
The nearest ECCC normals location to Saint-Joseph-du-Lac is Montréal Trudeau (Airport), 20 km east, and every figure on this page is its.
A year in Saint-Joseph-du-Lac at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Joseph-du-Lac’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Joseph-du-Lac feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 146 frosts and 121 warm days a year
Frost comes from October to April; in January almost every night freezes. 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
1,041 mm of precipitation in a typical year
The most falls in October, the least in February. 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
Expect snow from October to April, with about 52 cm in January, the snowiest month.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Saint-Joseph-du-Lac
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
The total grows by a degree for every degree a day’s mean sits under 18°C. That means homes here need less heating than 62% of Canadian towns.
Living with Saint-Joseph-du-Lac’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Count on about 167 frost-free days: the last frost averages 29 April, the first 14 October.
The comfortable months for a day outside, highs of 17–27°C and nights of 8°C or more: May, Jun, Jul, Aug and Sep.
Parks & trails →Bitter wind chill, under −20, comes on about 40 days a year.
Summer brings about 50 days when the humidex passes 30.
A normal year has no blizzard, flood or heat wave in it; Saint-Joseph-du-Lac’s hazards page looks at those.
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 | 20 km east |
| 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 | Lachute, 30 km |
How Saint-Joseph-du-Lac 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
Places around Saint-Joseph-du-Lac whose figures come from another normals location. No closer place has figures: this one lies 10 km from Saint-Joseph-du-Lac.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Joseph-du-Lac Montréal Trudeau (Airport) | 26.7°C | −13.5°C | 1,041 mm |
| Kanesatake 10.0 km · Lachute | 26.5°C about the same | −14.7°C 1.2°C colder | 1,178 mm |
Saint-Joseph-du-Lac 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 year to year, January moves by 3.0°C, more than any month, and June least
Bars run from each month’s record low to its record high since 1991. March spans the most, from −26.9°C (1992) to 25.8°C (2012).
Where Saint-Joseph-du-Lac’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: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
- 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 Saint-Joseph-du-Lac’s climate
How warm does Saint-Joseph-du-Lac get in summer?
Expect highs near 26.7°C in July, the hottest month on average.
How cold does Saint-Joseph-du-Lac get in winter?
The year’s coldest nights belong to January, at about −13.5°C.
How much rain and snow does Saint-Joseph-du-Lac 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?
About 101 days a year have 1 cm of snow or more on the ground.
Are these figures for Saint-Joseph-du-Lac itself?
Only indirectly: the readings are made at Montréal Trudeau (Airport), outside Saint-Joseph-du-Lac.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Joseph-du-Lac →
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).