Photo: MTLskyline · CC BY-SA 3.0Lac-Brome is wetter than 94% of Canadian towns: 1,340 mm of rain and snow a year
Midwinter brings lows of about −13.5°C. The seasons are far apart: from a winter night to a summer afternoon the average spans 39°C. Frost comes on about 159 days a year, so leave time to clear the car.
Borrowed figures: Lac-Brome has no normals station, so these come from Sutton, 22 km south-west.
A year in Lac-Brome at a glance
Each month’s typical high and low, in °C.
What stands out about Lac-Brome’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Lac-Brome feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
Frost on 159 days, 20°C on 111
The frost season runs October to May, and January freezes nearly every night. Some 16 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 1,340 mm a year
The most falls in July, the least in February. 2nd wettest of 513 towns of 2,500+ in Quebec. Some 156 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 321 cm in a normal year
The snow season runs October to May; December brings the most, about 68 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Lac-Brome
91% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
A day averaging 10 degrees under 18°C adds 10 to the total; warm days add nothing.
Living with Lac-Brome’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Wait until about 15 May to plant out; frost tends to come back around 2 October, about 139 days later.
Highs of 17–27°C with nights of 8°C or more come in Jun, Jul, Aug and Sep.
Parks & trails →Thirty years of averages say little about one bad storm; Lac-Brome’s hazards page does.
Flood & hazards →ECCC’s normals location: Sutton
Every temperature, frost, snow and degree-day figure on this page is the 1991–2020 normal ECCC publishes for Sutton.
| Distance from the town | 22 km south-west |
| Station altitude | 244 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −36.5°C |
| Hottest reading, 1991–2020 | 33.5°C |
| Next-nearest location | Granby, 22 km |
How Lac-Brome 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
Places around Lac-Brome whose figures come from another normals location.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Lac-Brome Sutton | 25.3°C | −13.5°C | 1,340 mm |
| Waterloo 12 km · Granby | 25.6°C about the same | −13.4°C about the same | 1,226 mm |
| Bolton-Est 16 km · Sutton | 25.3°C about the same | −13.5°C about the same | 1,340 mm |
Lac-Brome weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −3.9°C | −13.5°C | −8.9°C | 97 mm | 63 cm |
| February | −2.3°C | −12.3°C | −7.4°C | 84 mm | 62 cm |
| March | 2.8°C | −6.7°C | −2.0°C | 100 mm | 58 cm |
| April | 10.8°C | 0.4°C | 5.8°C | 111 mm | 26 cm |
| May | 18.6°C | 7.1°C | 12.8°C | 115 mm | 2 cm |
| June | 22.9°C | 11.9°C | 17.4°C | 114 mm | 0 cm |
| July | 25.3°C | 14.5°C | 19.7°C | 128 mm | 0 cm |
| August | 24.3°C | 13.7°C | 19.0°C | 123 mm | 0 cm |
| September | 20.3°C | 9.6°C | 14.9°C | 119 mm | 0 cm |
| October | 13.1°C | 3.9°C | 8.5°C | 127 mm | 9 cm |
| November | 5.9°C | −2.1°C | 2.0°C | 112 mm | 34 cm |
| December | −0.7°C | −8.7°C | −4.8°C | 111 mm | 68 cm |
| Year | 11.4°C | 1.5°C | 6.4°C | 1,340 mm | 321 cm |
In February, anything from −36.5°C to 19.0°C
January is the least predictable month: about two years in three its average lands within 3.2°C of the normal, −8.9°C. August is the steadiest, within 1.0°C.
Where Lac-Brome’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the closest ECCC location with twelve months of temperature normals, Sutton, 1991–2020.
- Comparisons: every place of 2,500+ in Canada but the city hubs and the reserves, each on its nearest ECCC location.
- 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 Lac-Brome’s climate
How warm does Lac-Brome get in summer?
Expect highs near 25.3°C in July, the hottest month on average.
How cold does Lac-Brome get in winter?
On a normal January night the air drops to −13.5°C, the coldest of the year.
How much rain and snow does Lac-Brome get?
Over twelve months, rain and melted snow come to 1,340 mm; the range runs from 84 mm in February to 128 mm in July.
How long does snow stay on the ground?
Roughly 123 days a year start with snow cover of 1 cm or more.
Are these figures for Lac-Brome itself?
No, they come from Sutton; ECCC keeps no 1991–2020 normals in Lac-Brome itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Lac-Brome →
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).