Saint-Colomban is wetter than 88% of Canadian towns: 1,178 mm of rain and snow a year
High summer brings afternoon highs near 26.5°C. Winter nights are cold: in January they are colder than in 67% of Canadian towns. Of all months, October brings the most precipitation and February the least. Have the furnace checked before October to April, the months that average under 10°C.
Saint-Colomban has no ECCC normals station of its own: every figure here comes from Lachute, 21 km south-west.
A year in Saint-Colomban at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Colomban’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Colomban feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 159 frosts and 115 warm days a year
The frost season runs October to May, and January freezes nearly every night. On about 19 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 1,178 mm of rain and snow a year
Some 143 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 218 cm of snow a year
From October to April snow is likely; January is the peak, at about 56 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Saint-Colomban
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Warm days count for nothing; each colder day adds how far its mean sits below 18°C.
Living with Saint-Colomban’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Between the last frost, near 12 May, and the first, near 3 October, lie about 143 frost-free days.
Plan time outside for Jun, Jul, Aug and Sep: highs of 17–27°C and nights no colder than 8°C.
Parks & trails →Extremes don’t show in averages: floods, wildfire smoke and ice storms are on Saint-Colomban’s hazards page.
Flood & hazards →ECCC’s normals location: Lachute
Every temperature, frost, snow and degree-day figure on this page is the 1991–2020 normal ECCC publishes for Lachute.
| Distance from the town | 21 km south-west |
| Station altitude | 91 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −36.0°C |
| Hottest reading, 1991–2020 | 36.0°C |
| Next-nearest location | Montréal Trudeau (Airport), 41 km |
How Saint-Colomban 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
Places around Saint-Colomban whose figures come from another normals location. Saint-Colomban has few close neighbours with figures, so the list reaches 15–24 km out.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Colomban Lachute | 26.5°C | −14.7°C | 1,178 mm |
| Mirabel 15 km · Montréal Trudeau (Airport) | 26.7°C about the same | −13.5°C 1.2°C milder | 1,041 mm |
| Sainte-Anne-des-Plaines 22 km · L'Assomption | 26.6°C about the same | −16.0°C 1.3°C colder | 1,041 mm |
Saint-Colomban weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −5.5°C | −14.7°C | −10.2°C | 97 mm | 56 cm |
| February | −3.6°C | −13.6°C | −8.3°C | 72 mm | 47 cm |
| March | 2.4°C | −7.2°C | −2.5°C | 74 mm | 34 cm |
| April | 11.0°C | 0.5°C | 5.9°C | 100 mm | 8 cm |
| May | 19.4°C | 7.4°C | 13.3°C | 89 mm | 0 cm |
| June | 24.1°C | 12.6°C | 18.4°C | 111 mm | 0 cm |
| July | 26.5°C | 15.1°C | 20.5°C | 112 mm | 0 cm |
| August | 25.4°C | 14.3°C | 19.8°C | 104 mm | 0 cm |
| September | 20.8°C | 9.9°C | 15.4°C | 114 mm | 0 cm |
| October | 12.8°C | 3.7°C | 8.4°C | 120 mm | 2 cm |
| November | 5.2°C | −2.3°C | 1.6°C | 93 mm | 17 cm |
| December | −1.9°C | −9.5°C | −6.0°C | 94 mm | 53 cm |
| Year | 11.4°C | 1.4°C | 6.4°C | 1,178 mm | 218 cm |
A January here can run warm or cold, its average moving by about 3.2°C; the steadiest month is August
Each bar spans a month’s coldest and warmest readings over thirty years; March’s run from −30.5°C in 2007 to 26.5°C in 2012.
Where Saint-Colomban’s numbers come from
Averages over 30 years, not a forecast.
- Normals: 1991–2020 normals for Lachute from ECCC’s climate data site, the nearest location with every month of temperature.
- 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: sunshine, which none of ECCC’s 450 locations publishes for 1991–2020, and the town’s own height above sea level, so no figure is adjusted for altitude.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Saint-Colomban’s climate
How warm does Saint-Colomban get in summer?
Midsummer means July, with afternoons near 26.5°C on a typical day.
How cold does Saint-Colomban get in winter?
Overnight lows average −14.7°C in January, the coldest month.
How much rain and snow does Saint-Colomban get?
Precipitation totals 1,178 mm a year, with October the wettest month (120 mm) and February the driest (72 mm).
How long does snow stay on the ground?
The ground is white, with 1 cm or more, on some 128 days a year.
Are these figures for Saint-Colomban itself?
No, they come from Lachute; ECCC keeps no 1991–2020 normals in Saint-Colomban itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Colomban →
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).