Photo: Veillg1 · CC BY-SA 4.0Precipitation in Saint-Mathias-sur-Richelieu tops that of 74% of Canadian towns: 1,041 mm a year
In July the day’s top temperature is typically 26.6°C. Seasons differ by 40°C, from the coldest nights to the warmest afternoons. Summer afternoons here are warmer than in 70% of Canadian towns. Windshields need scraping on about 149 mornings a year, the days the air reaches 0°C or below.
Saint-Mathias-sur-Richelieu has no ECCC normals station of its own: every figure here comes from L'Acadie, 22 km south.
A year in Saint-Mathias-sur-Richelieu at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Mathias-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-Mathias-sur-Richelieu feels like
Each season’s and each month’s usual high and low, 1991–2020.
149 frost days and 124 days above 20°C a year
Frost comes from October to April; in January almost every night freezes. On about 15 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
1,041 mm of precipitation in a typical year
The most falls in October, the least in February. Some 122 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: Montréal Trudeau (Airport), 39 km away (L'Acadie records no complete year of either).
Snowfall: about 217 cm in a normal year
Expect snow from October to April, with about 52 cm in January, the snowiest month.
Snowfall by month
Centimetres
Heating a home in Saint-Mathias-sur-Richelieu
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
ECCC sums, over the year, how many degrees each day’s average falls short of 18°C.
Living with Saint-Mathias-sur-Richelieu’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark Jun, Jul, Aug and Sep.
Parks & trails →On some 36 days a year the wind chill drops past −20; mitts and a scarf earn their place.
Humid summer days, the humidex above 30, number about 50 a year.
Thirty years of averages say little about one bad storm; Saint-Mathias-sur-Richelieu’s hazards page does.
Flood & hazards →ECCC’s normals location: L'Acadie
Every temperature, frost, snow and degree-day figure on this page is the 1991–2020 normal ECCC publishes for L'Acadie.
| Distance from the town | 22 km south |
| Station altitude | 44 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Precipitation from | Montréal Trudeau (Airport), 39 km |
| Coldest reading, 1991–2020 | −32.5°C |
| Hottest reading, 1991–2020 | 36.1°C |
| Average wind | 11.4 km/h on average, most often from the west |
| Next-nearest location | Montréal Trudeau (Airport), 39 km |
How Saint-Mathias-sur-Richelieu 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 Saint-Mathias-sur-Richelieu’s would only repeat its figures. Saint-Mathias-sur-Richelieu has few close neighbours with figures, so the list reaches 11–16 km out.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Mathias-sur-Richelieu L'Acadie | 26.6°C | −13.6°C | 1,041 mm |
| Mont-Saint-Hilaire 11 km · Fleury | 26.0°C 0.6°C cooler | −14.8°C 1.2°C colder | 1,109 mm |
| Saint-Mathieu-de-Beloeil 13 km · L'Assomption | 26.6°C about the same | −16.0°C 2.4°C colder | 1,109 mm |
| Longueuil 16 km · Montréal Trudeau (Airport) | 26.7°C about the same | −13.5°C about the same | 1,041 mm |
Saint-Mathias-sur-Richelieu 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 | −4.3°C | −13.6°C | −9.0°C | 86 mm | 52 cm |
| February | −2.9°C | −12.7°C | −7.8°C | 66 mm | 47 cm |
| March | 2.6°C | −6.7°C | −2.1°C | 77 mm | 37 cm |
| April | 11.1°C | 0.7°C | 5.9°C | 90 mm | 15 cm |
| May | 19.5°C | 7.8°C | 13.7°C | 86 mm | 0 cm |
| June | 24.2°C | 13.2°C | 18.7°C | 84 mm | 0 cm |
| July | 26.6°C | 15.5°C | 21.1°C | 91 mm | 0 cm |
| August | 25.3°C | 13.9°C | 19.6°C | 94 mm | 0 cm |
| September | 21.4°C | 9.7°C | 15.6°C | 89 mm | 0 cm |
| October | 13.6°C | 4.1°C | 8.9°C | 103 mm | 1 cm |
| November | 6.1°C | −1.7°C | 2.2°C | 84 mm | 16 cm |
| December | −0.7°C | −8.6°C | −4.7°C | 92 mm | 48 cm |
| Year | 11.9°C | 1.8°C | 6.8°C | 1,041 mm | 217 cm |
A January here can run warm or cold, its average moving by about 2.9°C; the steadiest month is August
Over 1991–2020, March saw both −28.7°C (2003) and 25.4°C (2012), the widest span of any month.
Where Saint-Mathias-sur-Richelieu’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 normals from ECCC for L'Acadie, its nearest location with complete temperatures.
- Other locations: ECCC blanks a month that fails its completeness rule, so the precipitation or snowfall here comes from the next location with all twelve months.
- 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-Mathias-sur-Richelieu’s climate
How warm does Saint-Mathias-sur-Richelieu get in summer?
Expect highs near 26.6°C in July, the hottest month on average.
How cold does Saint-Mathias-sur-Richelieu get in winter?
A typical January night falls to −13.6°C, the year’s low point.
How much rain and snow does Saint-Mathias-sur-Richelieu get?
Count on roughly 1,041 mm a year, heaviest in October (103 mm) and lightest in February (66 mm).
Are these figures for Saint-Mathias-sur-Richelieu itself?
They are the closest available: the normals for L'Acadie, since Saint-Mathias-sur-Richelieu has none.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Mathias-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).