Afternoon heat in Deux-Montagnes beats that of 78% of Canadian towns
Midwinter brings lows of about −13.5°C. October is the wettest month, February the driest. By precipitation alone, it ranks wetter than 74% of Canadian towns. Heating does most of its work from October to April, in months below 10°C on average.
Borrowed figures: Deux-Montagnes has no normals station, so these come from Montréal Trudeau (Airport), 14 km south-east.
A year in Deux-Montagnes at a glance
Each month’s typical high and low, in °C.
What stands out about Deux-Montagnes’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Deux-Montagnes feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
146 frost days and 121 days above 20°C a year
The frost season runs October to April, and January freezes nearly every night. Deep cold, under −20°C, comes on about 12 nights a year.
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
About 122 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 217 cm of snow a year
From October to April snow is likely; January is the peak, at about 52 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Deux-Montagnes
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
A heating degree day is one degree of shortfall below 18°C for one day, summed over the year. That means homes here need less heating than 62% of Canadian towns.
Living with Deux-Montagnes’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Tender plants are usually safe from around 29 April until frost returns near 14 October: about 167 days.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark May, Jun, Jul, Aug and Sep.
Parks & trails →Count on some 40 days a year when the wind makes it feel below −20.
Muggy heat with a humidex over 30 arrives on about 50 days a year.
Bad-weather days, from blizzards to floods, get their own page for Deux-Montagnes: the hazards page.
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 | 14 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 Deux-Montagnes 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 Deux-Montagnes’s own would show the same figures). The nearest places to Deux-Montagnes with figures are 18–25 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Deux-Montagnes Montréal Trudeau (Airport) | 26.7°C | −13.5°C | 1,041 mm |
| Kanesatake 18 km · Lachute | 26.5°C about the same | −14.7°C 1.2°C colder | 1,178 mm |
| Sainte-Anne-des-Plaines 25 km · L'Assomption | 26.6°C about the same | −16.0°C 2.5°C colder | 1,041 mm |
Deux-Montagnes 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 |
A January here can run warm or cold, its average moving by about 3.0°C; the steadiest month is June
March has the widest record range, −26.9°C in 1992 to 25.8°C in 2012; the tick on each bar is the month’s normal.
Where Deux-Montagnes’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at Montréal Trudeau (Airport) (the closest location with all twelve months of temperatures).
- Comparisons: the towns and neighbourhoods of 2,500+ across Canada, each on its nearest normals location, without the city totals or the reserves.
- 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 Deux-Montagnes’s climate
How warm does Deux-Montagnes get in summer?
On a normal day in July the thermometer climbs to 26.7°C, the warmest of the year.
How cold does Deux-Montagnes get in winter?
January nights average −13.5°C, the coldest of the year.
How much rain and snow does Deux-Montagnes get?
About 1,041 mm a year, rain and melted snow together. October is the wettest month (103 mm) and February the driest (66 mm).
How long does snow stay on the ground?
Expect snow on the ground, at least 1 cm, for about 101 days a year.
Are these figures for Deux-Montagnes itself?
No. ECCC measures normals at Montréal Trudeau (Airport), not in Deux-Montagnes; the page uses the nearest it has.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Deux-Montagnes →
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).