Photo: Richard Mc Neil · CC BY 3.0Winter nights in Terrebonne are colder than in 75% of Canadian towns
Expect July afternoons of about 26.6°C. A year here swings 43°C from midwinter lows to midsummer highs. It is a wet place: more rain and snow fall here than on 74% of Canadian towns. Plan for rain or snow on about 122 days a year, the days with 1 mm or more.
ECCC publishes no normals for Terrebonne itself; the figures are those of L'Assomption, 21 km north-east.
A year in Terrebonne at a glance
Each month’s typical high and low, in °C.
What stands out about Terrebonne’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Terrebonne feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
161 frost days and 119 days above 20°C a year
The frost season runs October to May, and January freezes nearly every night. Some 24 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
October brings the most rain and snow; February, the least.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
ECCC’s L'Assomption normals leave out precipitation and snow; both come from Montréal Trudeau (Airport) here, 28 km away.
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
Heating a home in Terrebonne
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.
Living with Terrebonne’s climate
What the normals mean for a garden, a day outside and the depth of winter.
The outdoor season by the averages is Jun, Jul, Aug and Sep, with highs of 17–27°C and lows of 8°C or more.
Parks & trails →The wind chill passes −20 on about 44 days in a normal year.
Humid summer days, the humidex above 30, number about 49 a year.
Bad-weather days, from blizzards to floods, get their own page for Terrebonne: the hazards page.
Flood & hazards →ECCC’s normals location: L'Assomption
The page’s figures are ECCC’s 1991–2020 normals for L'Assomption, one of its 450 normals locations.
| Distance from the town | 21 km north-east |
| Station altitude | 21 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Precipitation from | Montréal Trudeau (Airport), 28 km |
| Coldest reading, 1991–2020 | −40.0°C |
| Hottest reading, 1991–2020 | 36.2°C |
| Average wind | 10.0 km/h on average, most often from the south-west |
| Next-nearest location | Montréal Trudeau (Airport), 28 km |
How Terrebonne compares
Placed among 2,611 Canadian towns and neighbourhoods of 2,500+, each on its nearest normals location; each dot is another location used in Quebec.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share Terrebonne’s would only repeat its figures.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Terrebonne L'Assomption | 26.6°C | −16.0°C | 1,041 mm |
| Mascouche 4.3 km · L'Assomption | 26.6°C about the same | −16.0°C about the same | 1,041 mm |
| Bois-des-Filion 9.0 km · Montréal Trudeau (Airport) | 26.7°C about the same | −13.5°C 2.5°C milder | 1,041 mm |
Terrebonne 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 | −5.9°C | −16.0°C | −10.9°C | 86 mm | 52 cm |
| February | −4.0°C | −14.8°C | −9.4°C | 66 mm | 47 cm |
| March | 1.8°C | −8.3°C | −3.2°C | 77 mm | 37 cm |
| April | 10.8°C | 0.1°C | 5.5°C | 90 mm | 15 cm |
| May | 19.2°C | 7.2°C | 13.2°C | 86 mm | 0 cm |
| June | 24.3°C | 12.4°C | 18.4°C | 84 mm | 0 cm |
| July | 26.6°C | 14.8°C | 20.7°C | 91 mm | 0 cm |
| August | 25.5°C | 13.7°C | 19.6°C | 94 mm | 0 cm |
| September | 21.1°C | 9.2°C | 15.2°C | 89 mm | 0 cm |
| October | 13.0°C | 3.2°C | 8.1°C | 103 mm | 1 cm |
| November | 5.4°C | −2.7°C | 1.3°C | 84 mm | 16 cm |
| December | −1.9°C | −10.2°C | −6.1°C | 92 mm | 48 cm |
| Year | 11.3°C | 0.7°C | 6.0°C | 1,041 mm | 217 cm |
Two years in three, January’s average lands within 3.1°C of normal, against the steadier June
Each bar spans a month’s coldest and warmest readings over thirty years; March’s run from −29.5°C in 1992 to 26.0°C in 2012.
Where Terrebonne’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at L'Assomption (the closest location with all twelve months of temperatures).
- Other locations: a location missing months of precipitation or snow is filled from the nearest that has them all, never mixed month by month.
- Comparisons: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest location.
- Not on this page: hours of sunshine, missing from the 1991–2020 normals, and a height correction: the town has no elevation on file.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Terrebonne’s climate
How warm does Terrebonne get in summer?
On a normal day in July the thermometer climbs to 26.6°C, the warmest of the year.
How cold does Terrebonne get in winter?
At its coldest, in January, the normal low is −16.0°C.
How much rain and snow does Terrebonne get?
Rain and snow, with snow counted as water, total 1,041 mm a year; October leads with 103 mm and February trails with 66 mm.
Are these figures for Terrebonne itself?
The figures are ECCC’s for L'Assomption; Terrebonne has no normals station.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Terrebonne →
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).