Snowdon has warmer summer afternoons than 78% of Canadian towns
The depth of winter brings overnight lows near −13.5°C. Expect the most rain and snow in October and the least in February. By precipitation alone, it ranks wetter than 74% of Canadian towns. Wet days, with 1 mm of rain or snow or more, come about 122 times a year.
Environment and Climate Change Canada’s 1991–2020 normals at its Montréal Trudeau (Airport) station, 9.4 km west.
A year in Snowdon at a glance
Each month’s typical high and low, in °C.
What stands out about Snowdon’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Snowdon 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
From October to April frost is routine, and in January it comes on almost every night. On about 12 nights a year the air falls below −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
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 217 cm of snow a 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 Snowdon
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Each day the mean sits under 18°C adds its shortfall; a year’s total is its heating degree days. A house here needs less heating than 62% of Canadian towns.
Living with Snowdon’s climate
What the normals mean for a garden, a day outside and the depth of winter.
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 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 →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.
For the weather that does damage, from ice storms to floods, see Snowdon’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 | 9.4 km 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, 31 km |
How Snowdon 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
Nearby places read from a different ECCC location (places on Snowdon’s own would show the same figures). No closer places have figures: these lie 14–19 km from Snowdon.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Snowdon Montréal Trudeau (Airport) | 26.7°C | −13.5°C | 1,041 mm |
| Brossard 14 km · L'Acadie | 26.6°C about the same | −13.6°C about the same | 1,041 mm |
| Montréal-Est 19 km · L'Assomption | 26.6°C about the same | −16.0°C 2.5°C colder | 1,041 mm |
Snowdon 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 |
January strays furthest from its normal year to year, by 3.0°C; June the least
Over 1991–2020, March saw both −26.9°C (1992) and 25.8°C (2012), the widest span of any month.
Where Snowdon’s numbers come from
Averages over 30 years, not a forecast.
- Normals: Environment and Climate Change Canada’s 1991–2020 normals, Montréal Trudeau (Airport): the nearest of its locations with every month’s temperatures.
- 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 Snowdon’s climate
How warm does Snowdon get in summer?
Highs reach 26.7°C on an average July day; no month is warmer.
How cold does Snowdon get in winter?
January nights average −13.5°C, the coldest of the year.
How much rain and snow does Snowdon 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?
On about 101 days a year the ground keeps at least 1 cm of snow.
Are these figures for Snowdon itself?
Almost: ECCC’s Montréal Trudeau (Airport) location, which gives these figures, lies a short way outside Snowdon.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Snowdon →
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).