Photo: Groupe de recherche en art du Québec · CC BY-SA 4.0July in Beauharnois runs hotter than in 78% of Canadian towns
Midwinter brings lows of about −13.5°C. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 40°C apart. Its yearly rain and snow top those of 74% of Canadian towns. Plan for rain or snow on about 122 days a year, the days with 1 mm or more.
The nearest ECCC normals location to Beauharnois is Montréal Trudeau (Airport), 21 km north-east, and every figure on this page is its.
A year in Beauharnois at a glance
Each month’s typical high and low, in °C.
What stands out about Beauharnois’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Beauharnois feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
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
About 1,041 mm of rain and snow a year
October is the wettest month and February the driest.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
217 cm of snow in a typical 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 Beauharnois
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. That means homes here need less heating than 62% of Canadian towns.
Living with Beauharnois’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Plant out after about 29 April; the first frost of autumn usually arrives near 14 October, leaving roughly 167 days without frost.
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 →On some 40 days a year the wind chill drops past −20; mitts and a scarf earn their place.
A humidex above 30 marks about 50 days in a normal year.
For blizzards, floods and wildfire, turn to Beauharnois’s hazards page.
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 | 21 km north-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 | L'Acadie, 41 km |
How Beauharnois 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 Beauharnois whose figures come from another normals location. No closer places have figures: these lie 16–23 km from Beauharnois.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Beauharnois Montréal Trudeau (Airport) | 26.7°C | −13.5°C | 1,041 mm |
| Saint-Louis-de-Gonzague 16 km · St-Anicet | 26.7°C about the same | −13.0°C 0.5°C milder | 1,047 mm |
| Saint-Rémi 21 km · L'Acadie | 26.6°C about the same | −13.6°C about the same | 1,041 mm |
Beauharnois 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 |
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 Beauharnois’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: Canadian towns and neighbourhoods of at least 2,500, each placed by its nearest location (city totals and reserves excluded).
- 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 Beauharnois’s climate
How warm does Beauharnois get in summer?
In July, the warmest month, the typical high is 26.7°C.
How cold does Beauharnois get in winter?
Midwinter means January, when a typical night reaches −13.5°C.
How much rain and snow does Beauharnois 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?
Snow cover of 1 cm or more lasts about 101 days in a typical year.
Are these figures for Beauharnois itself?
Only indirectly: the readings are made at Montréal Trudeau (Airport), outside Beauharnois.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Beauharnois →
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).