Wet weather: 1,109 mm of rain and snow a year falls on Saint-Sulpice, more than on 82% of Canadian towns
Midwinter brings lows of about −16.0°C. By January nights alone, it runs colder than 75% of Canadian towns. From frozen January to warm July, readings climb 43°C. Homes need heating from October to April, the months averaging under 10°C.
Borrowed figures: Saint-Sulpice has no normals station, so these come from L'Assomption, 5.4 km south-west.
A year in Saint-Sulpice at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Sulpice’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Sulpice 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
From October to May frost is routine, and in January it comes on almost every night. Deep cold, under −20°C, comes on about 24 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
Rain and melted snow: about 1,109 mm a year
August brings the most rain and snow; February, the least. About 145 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
ECCC’s L'Assomption normals leave out precipitation and snow; both come from Fleury here, 29 km away.
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 Saint-Sulpice
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
A heating degree day is one degree of shortfall below 18°C for one day, summed over the year.
Living with Saint-Sulpice’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
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 →The wind chill passes −20 on about 44 days in a normal year.
The humidex tops 30 on about 49 days a year: muggy days to plan around.
For the weather that does damage, from ice storms to floods, see Saint-Sulpice’s hazards page.
Flood & hazards →ECCC’s normals location: L'Assomption
L'Assomption is one of the 450 places where ECCC publishes 1991–2020 normals.
| Distance from the town | 5.4 km south-west |
| Station altitude | 21 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Precipitation from | Fleury, 29 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, 29 km |
How Saint-Sulpice compares
Placed among 2,611 Canadian towns and neighbourhoods of 2,500+, each on its nearest normals location; each dot is another location used in Quebec.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share Saint-Sulpice’s would only repeat its figures. The one place listed is 15 km from Saint-Sulpice, the nearest with figures.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Sulpice L'Assomption | 26.6°C | −16.0°C | 1,109 mm |
| Saint-Antoine-sur-Richelieu 15 km · Fleury | 26.0°C 0.6°C cooler | −14.8°C 1.2°C milder | 1,109 mm |
Saint-Sulpice 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 | −5.9°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 |
January varies most from one year to the next (3.1°C), June least
The thirty-year records stretch furthest in March: a low of −29.5°C in 1992 and a high of 26.0°C in 2012.
Where Saint-Sulpice’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for L'Assomption, the nearest location with a full year of temperatures.
- 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: 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 Saint-Sulpice’s climate
How warm does Saint-Sulpice get in summer?
Of all twelve months, July has the warmest afternoons, about 26.6°C.
How cold does Saint-Sulpice get in winter?
In January, the coldest month, the typical low is −16.0°C.
How much rain and snow does Saint-Sulpice get?
Precipitation totals 1,109 mm a year, with August the wettest month (114 mm) and February the driest (61 mm).
Are these figures for Saint-Sulpice itself?
Only indirectly: the readings are made at L'Assomption, outside Saint-Sulpice.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Sulpice →
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).