More rain and snow fall on Brownsburg-Chatham than on 88% of Canadian towns: 1,178 mm a year
Midsummer highs settle at about 26.5°C. Rain or snow is most frequent in October and least in February. Winter nights are cold: in January they are colder than in 67% of Canadian towns. Plan for rain or snow on about 143 days a year, the days with 1 mm or more.
Brownsburg-Chatham has no ECCC normals station of its own: every figure here comes from Lachute, 7.3 km east.
A year in Brownsburg-Chatham at a glance
Each month’s typical high and low, in °C.
What stands out about Brownsburg-Chatham’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Brownsburg-Chatham feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 159 days, 20°C on 115
Frost comes from October to May; in January almost every night freezes. Some 19 nights a year drop under −20°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
Rain and melted snow: about 1,178 mm a year
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
218 cm of snow in a typical year
The snow season runs October to April; January brings the most, about 56 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Brownsburg-Chatham
93% 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 Brownsburg-Chatham’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Gardens get from about 12 May to 3 October without frost, around 143 days in all.
Mild days and mild nights together (17–27°C by day, 8°C or more at night) belong to Jun, Jul, Aug and Sep.
Parks & trails →A typical year is calm by definition; Brownsburg-Chatham’s hazards page covers the exceptions.
Flood & hazards →ECCC’s normals location: Lachute
The page’s figures are ECCC’s 1991–2020 normals for Lachute, one of its 450 normals locations.
| Distance from the town | 7.3 km east |
| 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 | St-Jovite, 46 km |
How Brownsburg-Chatham 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 Brownsburg-Chatham’s would only repeat its figures. Brownsburg-Chatham has few close neighbours with figures, so the list reaches 32–38 km out.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Brownsburg-Chatham Lachute | 26.5°C | −14.7°C | 1,178 mm |
| Saint-Adolphe-d'Howard 32 km · St-Jovite | 25.3°C 1.2°C cooler | −18.3°C 3.6°C colder | 1,178 mm |
| Oka 35 km · Montréal Trudeau (Airport) | 26.7°C about the same | −13.5°C 1.2°C milder | 1,041 mm |
Brownsburg-Chatham 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 | −5.5°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 |
In March, anything from −30.5°C to 26.5°C
January is the least predictable month: about two years in three its average lands within 3.2°C of the normal, −10.2°C. August is the steadiest, within 1.0°C.
Where Brownsburg-Chatham’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 normals from ECCC for Lachute, its nearest location with complete 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: hours of sunshine, missing from the 1991–2020 normals, and a height correction: the town has no elevation on file.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Brownsburg-Chatham’s climate
How warm does Brownsburg-Chatham get in summer?
Of all twelve months, July has the warmest afternoons, about 26.5°C.
How cold does Brownsburg-Chatham get in winter?
Expect nights around −14.7°C in January; no month is colder.
How much rain and snow does Brownsburg-Chatham get?
Count on roughly 1,178 mm a year, heaviest in October (120 mm) and lightest in February (72 mm).
How long does snow stay on the ground?
Snow lies on the ground for about 128 days in a normal year.
Are these figures for Brownsburg-Chatham itself?
They are borrowed from Lachute, the nearest place to Brownsburg-Chatham where ECCC publishes 1991–2020 normals.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Brownsburg-Chatham →
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).