More rain and snow fall on Lavaltrie than on 82% of Canadian towns: 1,109 mm a year
July afternoons average 26.6°C. In January, nights here are colder than in 75% of Canadian towns. The wettest month is August; the driest is February. Warm coats and heating bills mark the months from October to April, when means dip under 10°C.
The nearest ECCC normals location to Lavaltrie is L'Assomption, 13 km south-west, and every figure on this page is its.
A year in Lavaltrie at a glance
Each month’s typical high and low, in °C.
What stands out about Lavaltrie’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Lavaltrie feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
About 161 frosts and 119 warm days a year
Frost comes from October to May; in January almost every night freezes. Some 24 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
1,109 mm of precipitation in a typical year
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
Precipitation and snowfall: Fleury, 24 km away (L'Assomption records no complete year of either).
Snowfall: about 202 cm in a normal year
Expect snow from October to April, with about 49 cm in December, the snowiest month.
Snowfall by month
Centimetres
Heating a home in Lavaltrie
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Measured against 18°C: each day’s shortfall in mean temperature, added over twelve months.
Living with Lavaltrie’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
For long days outdoors, Jun, Jul, Aug and Sep bring highs of 17–27°C and lows of 8°C or more.
Parks & trails →On some 44 days a year the wind chill drops past −20; mitts and a scarf earn their place.
About 49 days a year feel above 30 on the humidex.
Thirty years of averages say little about one bad storm; Lavaltrie’s hazards page does.
Flood & hazards →ECCC’s normals location: L'Assomption
The page’s figures are ECCC’s 1991–2020 normals for L'Assomption, one of its 450 normals locations.
| Distance from the town | 13 km south-west |
| Station altitude | 21 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Precipitation from | Fleury, 24 km |
| Coldest reading, 1991–2020 | −40.0°C |
| Hottest reading, 1991–2020 | 36.2°C |
| Average wind | 10.0 km/h on average, most often from the south-west |
| Next-nearest location | Fleury, 24 km |
How Lavaltrie 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 Lavaltrie whose figures come from another normals location.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Lavaltrie L'Assomption | 26.6°C | −16.0°C | 1,109 mm |
| Contrecoeur 5.8 km · L'Assomption | 26.6°C about the same | −16.0°C about the same | 1,109 mm |
| Saint-Roch-de-Richelieu 10 km · Fleury | 26.0°C 0.6°C cooler | −14.8°C 1.2°C milder | 1,109 mm |
Lavaltrie 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 | −5.9°C | −16.0°C | −10.9°C | 81 mm | 45 cm |
| February | −4.0°C | −14.8°C | −9.4°C | 61 mm | 43 cm |
| March | 1.8°C | −8.3°C | −3.2°C | 71 mm | 38 cm |
| April | 10.8°C | 0.1°C | 5.5°C | 96 mm | 13 cm |
| May | 19.2°C | 7.2°C | 13.2°C | 98 mm | under 1 cm |
| June | 24.3°C | 12.4°C | 18.4°C | 102 mm | 0 cm |
| July | 26.6°C | 14.8°C | 20.7°C | 106 mm | 0 cm |
| August | 25.5°C | 13.7°C | 19.6°C | 114 mm | 0 cm |
| September | 21.1°C | 9.2°C | 15.2°C | 97 mm | 0 cm |
| October | 13.0°C | 3.2°C | 8.1°C | 108 mm | 2 cm |
| November | 5.4°C | −2.7°C | 1.3°C | 90 mm | 12 cm |
| December | −1.9°C | −10.2°C | −6.1°C | 85 mm | 49 cm |
| Year | 11.3°C | 0.7°C | 6.0°C | 1,109 mm | 202 cm |
March has run from −29.5°C to 26.0°C in thirty years
From one year to the next, January’s average typically shifts by 3.1°C around its normal of −10.9°C, the widest of any month, while June’s shifts by 1.0°C.
Where Lavaltrie’s numbers come from
Averages over 30 years, not a forecast.
- Normals: 1991–2020 normals for L'Assomption from ECCC’s climate data site, the nearest location with every month of temperature.
- Other locations: where a location publishes no full year of precipitation or snowfall, the nearest one that does supplies it, named beside those figures.
- Comparisons: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
- Not on this page: sunshine, not in ECCC’s 1991–2020 normals, and the effect of the town’s height, for which there is no figure.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Lavaltrie’s climate
How warm does Lavaltrie get in summer?
Expect highs near 26.6°C in July, the hottest month on average.
How cold does Lavaltrie get in winter?
Lows sink to −16.0°C on an average January night.
How much rain and snow does Lavaltrie get?
The yearly total is about 1,109 mm. August gets 114 mm, the most of any month; February gets 61 mm, the least.
Are these figures for Lavaltrie itself?
Not directly: Lavaltrie has no ECCC normals of its own, and L'Assomption stands in for it.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Lavaltrie →
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).