Photo: Cecil Adelaide · Public domainSummer afternoons in Saint-Eustache are warmer than in 78% of Canadian towns
Deep winter brings January lows near −13.5°C. Counting rain and snow together, it is wetter than 74% of Canadian towns. Rain or snow is most frequent in October and least in February. Warm coats and heating bills mark the months from October to April, when means dip under 10°C.
The nearest ECCC normals location to Saint-Eustache is Montréal Trudeau (Airport), 16 km south-east, and every figure on this page is its.
A year in Saint-Eustache at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Eustache’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Eustache feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 146 days, 20°C on 121
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
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
Snow falls from October to April, most of all in January (about 52 cm).
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Saint-Eustache
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. A house here needs less heating than 62% of Canadian towns.
Living with Saint-Eustache’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Wait until about 29 April to plant out; frost tends to come back around 14 October, about 167 days later.
The outdoor season by the averages is May, Jun, Jul, Aug and Sep, with 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.
Thirty years of averages say little about one bad storm; Saint-Eustache’s hazards page does.
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 | 16 km south-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, 35 km |
How Saint-Eustache 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
The nearest places on a normals location of their own: those that share Saint-Eustache’s would only repeat its figures. No closer places have figures: these lie 19–24 km from Saint-Eustache.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Eustache Montréal Trudeau (Airport) | 26.7°C | −13.5°C | 1,041 mm |
| Kanesatake 19 km · Lachute | 26.5°C about the same | −14.7°C 1.2°C colder | 1,178 mm |
| Sainte-Anne-des-Plaines 22 km · L'Assomption | 26.6°C about the same | −16.0°C 2.5°C colder | 1,041 mm |
Saint-Eustache 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
Year to year, January varies most (a standard deviation of 3.0°C around −9.2°C) and June least (1.1°C).
Where Saint-Eustache’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: Canadian towns and neighbourhoods of at least 2,500, each placed by its nearest location (city totals and reserves excluded).
- Not on this page: sunshine (no 1991–2020 normals exist for it) and any altitude adjustment, since there is no elevation for the town itself.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Saint-Eustache’s climate
How warm does Saint-Eustache get in summer?
Midsummer means July, with afternoons near 26.7°C on a typical day.
How cold does Saint-Eustache get in winter?
The year’s coldest nights belong to January, at about −13.5°C.
How much rain and snow does Saint-Eustache get?
October is the wettest month at 103 mm and February the driest at 66 mm, for 1,041 mm over the year.
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 Saint-Eustache itself?
No: Saint-Eustache has no normals location, so the figures come from Montréal Trudeau (Airport), the nearest with 1991–2020 normals.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Eustache →
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).