Photo: MatildaMars · CC0Afternoon heat in Delson beats that of 78% of Canadian towns
In January the night’s low is typically −13.5°C. Precipitation is plentiful here, more than falls on 74% of Canadian towns. Some 40°C separates winter nights from summer afternoons. The heating season runs October to April: each of those months averages under 10°C.
Delson has no ECCC normals station of its own: every figure here comes from Montréal Trudeau (Airport), 19 km north-west.
A year in Delson at a glance
Each month’s typical high and low, in °C.
What stands out about Delson’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Delson feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
146 frost days and 121 days above 20°C a year
Frost comes from October to April; in January almost every night freezes. 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
About 1,041 mm of rain and snow a year
October brings the most rain and snow; February, the least. Some 122 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 217 cm of snow a year
The snow season runs October to April; January brings the most, about 52 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Delson
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
ECCC sums, over the year, how many degrees each day’s average falls short of 18°C. By this count, homes here need less heating than 62% of Canadian towns.
Living with Delson’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Frost usually lets go around 29 April and returns near 14 October, about 167 days apart.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark May, Jun, Jul, Aug and Sep.
Parks & trails →About 40 days a year bring a wind chill under −20, when bare skin chills fast.
On some 50 days a year the humidex climbs past 30.
Ice storms, floods and heat waves are risks, not averages: they are on Delson’s 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 | 19 km north-west |
| 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, 19 km |
How Delson 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
The nearest places on a normals location of their own: those that share Delson’s would only repeat its figures.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Delson Montréal Trudeau (Airport) | 26.7°C | −13.5°C | 1,041 mm |
| Sainte-Catherine 1.9 km · Montréal Trudeau (Airport) | 26.7°C about the same | −13.5°C about the same | 1,041 mm |
| Candiac 2.9 km · L'Acadie | 26.6°C about the same | −13.6°C about the same | 1,041 mm |
Delson 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 |
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 Delson’s numbers come from
Averages over 30 years, not a forecast.
- Normals: 1991–2020 normals for Montréal Trudeau (Airport) from ECCC’s climate data site, the nearest location with every month of temperature.
- 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, absent from every 1991–2020 location, and an altitude correction, for want of the town’s own elevation.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Delson’s climate
How warm does Delson get in summer?
Afternoons average 26.7°C in July, the warmest time of year.
How cold does Delson get in winter?
Winter bottoms out in January, with lows near −13.5°C.
How much rain and snow does Delson get?
Precipitation totals 1,041 mm a year, with October the wettest month (103 mm) and February the driest (66 mm).
How long does snow stay on the ground?
A layer of at least 1 cm stays down on about 101 days a year.
Are these figures for Delson itself?
They are borrowed from Montréal Trudeau (Airport), the nearest place to Delson where ECCC publishes 1991–2020 normals.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Delson →
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).