Photo: Gabriel Picard · CC BY-SA 4.0More rain and snow fall on Bromont than on 91% of Canadian towns: 1,226 mm a year
The warmest part of a July day comes in at 25.6°C on average. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 39°C apart. Expect about 154 frosty starts a year, days when the air falls to freezing.
These are not Bromont’s own readings: ECCC keeps no normals there, so the page uses Granby, 9.3 km north-west.
A year in Bromont at a glance
Each month’s typical high and low, in °C.
What stands out about Bromont’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Bromont feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
About 154 frosts and 111 warm days a year
The frost season runs October to May, and January freezes nearly every night. Deep cold, under −20°C, comes on about 14 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
1,226 mm of precipitation in a typical year
July brings the most rain and snow; February, the least. Some 145 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 262 cm in a normal year
The snow season runs October to April; January brings the most, about 59 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Bromont
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
One degree below 18°C for one day makes one heating degree day; the year’s days are added together.
Living with Bromont’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Seedlings can go out once the average last frost, around 6 May, has passed; autumn’s first, near 8 October, ends a season of about 154 days.
Mild days and mild nights together (17–27°C by day, 8°C or more at night) belong to May, Jun, Jul, Aug and Sep.
Parks & trails →Averages smooth over blizzards, ice storms, floods and heat waves; Bromont’s hazards page covers the risks.
Flood & hazards →ECCC’s normals location: Granby
The page’s figures are ECCC’s 1991–2020 normals for Granby, one of its 450 normals locations.
| Distance from the town | 9.3 km north-west |
| Station altitude | 175 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −34.0°C |
| Hottest reading, 1991–2020 | 35.0°C |
| Next-nearest location | Sutton, 26 km |
How Bromont 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 Bromont’s own would show the same figures). Bromont has no close neighbour with figures; the nearest is 13 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Bromont Granby | 25.6°C | −13.4°C | 1,226 mm |
| Cowansville 13 km · Sutton | 25.3°C about the same | −13.5°C about the same | 1,340 mm |
Bromont weather by month
Month by month, 1991–2020: the usual high, low and mean, the rain and snow, and the snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −4.6°C | −13.4°C | −9.1°C | 95 mm | 59 cm |
| February | −3.2°C | −11.9°C | −7.4°C | 74 mm | 58 cm |
| March | 2.2°C | −6.4°C | −2.2°C | 88 mm | 48 cm |
| April | 10.5°C | 0.9°C | 5.9°C | 101 mm | 17 cm |
| May | 18.7°C | 8.0°C | 13.1°C | 100 mm | 1 cm |
| June | 23.3°C | 13.0°C | 18.3°C | 121 mm | 0 cm |
| July | 25.6°C | 15.7°C | 20.4°C | 122 mm | 0 cm |
| August | 24.6°C | 14.8°C | 19.5°C | 113 mm | 0 cm |
| September | 20.3°C | 10.6°C | 15.4°C | 113 mm | 0 cm |
| October | 12.8°C | 4.6°C | 8.6°C | 109 mm | 4 cm |
| November | 5.8°C | −1.5°C | 2.2°C | 92 mm | 22 cm |
| December | −1.0°C | −8.4°C | −4.9°C | 98 mm | 54 cm |
| Year | 11.3°C | 2.2°C | 6.6°C | 1,226 mm | 262 cm |
From −27.5°C to 25.0°C: March’s coldest and warmest days since 1991
The month to count on least is January: one year in three its average strays more than 3.4°C from −9.1°C. August moves least, typically by 1.0°C.
Where Bromont’s numbers come from
Averages over 30 years, not a forecast.
- Normals: 1991–2020 normals for Granby 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, 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 Bromont’s climate
How warm does Bromont get in summer?
Expect highs near 25.6°C in July, the hottest month on average.
How cold does Bromont get in winter?
A typical January night falls to −13.4°C, the year’s low point.
How much rain and snow does Bromont get?
Some 1,226 mm falls in a year. Most of it comes in July (122 mm), the least in February (74 mm).
How long does snow stay on the ground?
Around 113 days a year see 1 cm of snow or more lying.
Are these figures for Bromont itself?
No, they come from Granby; ECCC keeps no 1991–2020 normals in Bromont itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Bromont →
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).