Photo: Bull-Doser at English Wikipedia · Public domainSummer arrives in force in Rosemère, hotter than in 78% of Canadian towns
January nights here settle around −13.5°C. October is the wettest month, February the driest. By precipitation alone, it ranks wetter than 74% of Canadian towns. Have the furnace checked before October to April, the months that average under 10°C.
ECCC publishes no normals for Rosemère itself; the figures are those of Montréal Trudeau (Airport), 19 km south.
A year in Rosemère at a glance
Each month’s typical high and low, in °C.
What stands out about Rosemère’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Rosemère 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
Frost comes from October to April; in January almost every night freezes. 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
Rain and melted snow: about 1,041 mm a year
On about 122 days a year, 1 mm or more falls.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 217 cm of snow a 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 Rosemère
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Think of it as a year’s worth of daily shortfalls below 18°C, added up. By this count, homes here need less heating than 62% of Canadian towns.
Living with Rosemère’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
On average the last spring frost comes around 29 April and the first autumn frost around 14 October: about 167 frost-free days between.
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.
The humidex tops 30 on about 50 days a year: muggy days to plan around.
The normals describe a typical year, not its worst days; the hazards page covers Rosemère’s.
Flood & hazards →ECCC’s normals location: Montréal Trudeau (Airport)
ECCC builds the Montréal Trudeau (Airport) normals from 3 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 19 km south |
| 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'Assomption, 34 km |
How Rosemère 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
Nearby places read from a different ECCC location (places on Rosemère’s own would show the same figures). The one place listed is 13 km from Rosemère, the nearest with figures.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Rosemère Montréal Trudeau (Airport) | 26.7°C | −13.5°C | 1,041 mm |
| Terrebonne 13 km · L'Assomption | 26.6°C about the same | −16.0°C 2.5°C colder | 1,041 mm |
Rosemère 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 |
The month with the widest range: March, −26.9°C to 25.8°C
Two years in three, January’s average falls within 3.0°C of its normal of −9.2°C; June keeps to within 1.1°C.
Where Rosemère’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: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest location.
- 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 Rosemère’s climate
How warm does Rosemère get in summer?
At its warmest, in July, the normal high is 26.7°C.
How cold does Rosemère get in winter?
Midwinter means January, when a typical night reaches −13.5°C.
How much rain and snow does Rosemère get?
Count on roughly 1,041 mm a year, heaviest in October (103 mm) and lightest in February (66 mm).
How long does snow stay on the ground?
In a normal winter there are about 101 days with at least 1 cm of snow lying.
Are these figures for Rosemère itself?
Not as such: Montréal Trudeau (Airport) is the nearest normals location, and Rosemère has none.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Rosemère →
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).