Photo: Pymouss · CC BY-SA 4.0More rain and snow fall on Saint-Denis-sur-Richelieu than on 82% of Canadian towns: 1,109 mm a year
Sunny July days climb to about 26.0°C. Temperatures cover 41°C across the year, low to high. Winter nights are cold: in January they are colder than in 71% of Canadian towns. Comfortable outdoor weather lasts from June to September, with highs of 21–26°C.
Saint-Denis-sur-Richelieu has no ECCC normals station of its own: every figure here comes from Fleury, 12 km east.
A year in Saint-Denis-sur-Richelieu at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Denis-sur-Richelieu’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Denis-sur-Richelieu feels like
Each season’s and each month’s usual high and low, 1991–2020.
Frost on 161 days, 20°C on 115
From September to May frost is routine, and in January it comes on almost every night. On about 20 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
1,109 mm of precipitation in a typical year
The most falls in August, the least in February. 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
About 202 cm of snow a year
From October to April snow is likely; December is the peak, at about 49 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Saint-Denis-sur-Richelieu
92% 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 Saint-Denis-sur-Richelieu’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
The frost-free stretch runs from about 12 May to about 27 September, some 136 days in a normal year.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark Jun, Jul, Aug and Sep.
Parks & trails →Thirty years of averages say little about one bad storm; Saint-Denis-sur-Richelieu’s hazards page does.
Flood & hazards →ECCC’s normals location: Fleury
Every temperature, frost, snow and degree-day figure on this page is the 1991–2020 normal ECCC publishes for Fleury.
| Distance from the town | 12 km east |
| Station altitude | 31 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −39.0°C |
| Hottest reading, 1991–2020 | 35.1°C |
| Next-nearest location | L'Assomption, 21 km |
How Saint-Denis-sur-Richelieu 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
The nearest places on a normals location of their own: those that share Saint-Denis-sur-Richelieu’s would only repeat its figures. The one place listed is 10 km from Saint-Denis-sur-Richelieu, the nearest with figures.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Denis-sur-Richelieu Fleury | 26.0°C | −14.8°C | 1,109 mm |
| Contrecoeur 10.0 km · L'Assomption | 26.6°C 0.6°C warmer | −16.0°C 1.2°C colder | 1,109 mm |
Saint-Denis-sur-Richelieu 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 | −5.8°C | −14.8°C | −10.5°C | 81 mm | 45 cm |
| February | −3.8°C | −13.6°C | −8.6°C | 61 mm | 43 cm |
| March | 1.8°C | −7.3°C | −2.7°C | 71 mm | 38 cm |
| April | 10.5°C | 0.6°C | 5.8°C | 96 mm | 13 cm |
| May | 19.1°C | 7.4°C | 13.2°C | 98 mm | under 1 cm |
| June | 23.9°C | 12.7°C | 18.4°C | 102 mm | 0 cm |
| July | 26.0°C | 14.9°C | 20.2°C | 106 mm | 0 cm |
| August | 25.0°C | 13.7°C | 19.3°C | 114 mm | 0 cm |
| September | 20.7°C | 9.4°C | 15.1°C | 97 mm | 0 cm |
| October | 13.0°C | 3.6°C | 8.4°C | 108 mm | 2 cm |
| November | 5.5°C | −2.0°C | 1.9°C | 90 mm | 12 cm |
| December | −2.0°C | −9.3°C | −5.9°C | 85 mm | 49 cm |
| Year | 11.2°C | 1.3°C | 6.2°C | 1,109 mm | 202 cm |
The month with the widest range: March, −31.0°C to 25.5°C
Two years in three, January’s average falls within 3.1°C of its normal of −10.5°C; August keeps to within 0.9°C.
Where Saint-Denis-sur-Richelieu’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 Canadian Climate Normals at Fleury, the closest ECCC location with twelve months of temperature normals.
- 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 (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 Saint-Denis-sur-Richelieu’s climate
How warm does Saint-Denis-sur-Richelieu get in summer?
At its warmest, in July, the normal high is 26.0°C.
How cold does Saint-Denis-sur-Richelieu get in winter?
The year’s coldest nights belong to January, at about −14.8°C.
How much rain and snow does Saint-Denis-sur-Richelieu get?
Rain and snow, with snow counted as water, total 1,109 mm a year; August leads with 114 mm and February trails with 61 mm.
How long does snow stay on the ground?
In a normal winter there are about 106 days with at least 1 cm of snow lying.
Are these figures for Saint-Denis-sur-Richelieu itself?
Only indirectly: the readings are made at Fleury, outside Saint-Denis-sur-Richelieu.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Denis-sur-Richelieu →
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).