Photo: Gaétan Veillette · CC BY-SA 4.0Precipitation in Saint-Hyacinthe tops that of 82% of Canadian towns: 1,109 mm a year
The coldest hours of a January night bottom out at −14.8°C on average. Some 41°C separates winter nights from summer afternoons. By January nights alone, it runs colder than 71% of Canadian towns. Frost comes on about 161 days a year, so leave time to clear the car.
These are not Saint-Hyacinthe’s own readings: ECCC keeps no normals there, so the page uses Fleury, 20 km north.
A year in Saint-Hyacinthe at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Hyacinthe’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Hyacinthe feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
About 161 frosts and 115 warm days a year
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
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
About 202 cm of snow a year
Snow falls from October to April, most of all in December (about 49 cm).
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Saint-Hyacinthe
92% 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 Saint-Hyacinthe’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Frost usually lets go around 12 May and returns near 27 September, about 136 days apart.
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-Hyacinthe’s hazards page does.
Flood & hazards →ECCC’s normals location: Fleury
Fleury is one of the 450 places where ECCC publishes 1991–2020 normals.
| Distance from the town | 20 km north |
| 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 | Granby, 33 km |
How Saint-Hyacinthe 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-Hyacinthe’s would only repeat its figures. No closer places have figures: these lie 10–21 km from Saint-Hyacinthe.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Hyacinthe Fleury | 26.0°C | −14.8°C | 1,109 mm |
| Saint-Dominique 10 km · Granby | 25.6°C about the same | −13.4°C 1.4°C milder | 1,226 mm |
| Saint-Jean-Baptiste 19 km · L'Acadie | 26.6°C 0.6°C warmer | −13.6°C 1.2°C milder | 1,109 mm |
Saint-Hyacinthe weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| 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 |
March: −31.0°C at its coldest, 25.5°C at its warmest
Year to year, January varies most (a standard deviation of 3.1°C around −10.5°C) and August least (0.9°C).
Where Saint-Hyacinthe’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 normals from ECCC for Fleury, its nearest location with complete temperatures.
- Comparisons: Canadian towns and neighbourhoods of at least 2,500, each placed by its nearest location (city totals and reserves excluded).
- 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 Saint-Hyacinthe’s climate
How warm does Saint-Hyacinthe get in summer?
July is the warmest month, with average highs of 26.0°C.
How cold does Saint-Hyacinthe get in winter?
Lows sink to −14.8°C on an average January night.
How much rain and snow does Saint-Hyacinthe get?
Some 1,109 mm falls in a year. Most of it comes in August (114 mm), the least in February (61 mm).
How long does snow stay on the ground?
Roughly 106 days a year start with snow cover of 1 cm or more.
Are these figures for Saint-Hyacinthe itself?
No. ECCC measures normals at Fleury, not in Saint-Hyacinthe; the page uses the nearest it has.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Hyacinthe →
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).