Photo: Geai bleu · CC BY 3.0More rain and snow fall on Saint-Jacques than on 82% of Canadian towns: 1,109 mm a year
The coldest hours of a January night bottom out at −16.0°C on average. Winter nights are cold: in January they are colder than in 75% of Canadian towns. The gap between a January night and a July afternoon is 43°C. Homes need heating from October to April, the months averaging under 10°C.
The nearest ECCC normals location to Saint-Jacques is L'Assomption, 19 km south-east, and every figure on this page is its.
A year in Saint-Jacques at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Jacques’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Jacques feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 161 frosts and 119 warm days a year
Frost comes from October to May; in January almost every night freezes. 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
1,109 mm of precipitation in a typical year
August is the wettest month and February the driest. 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
ECCC’s L'Assomption normals leave out precipitation and snow; both come from Fleury here, 47 km away.
Snowfall: about 202 cm in a normal year
The snow season runs October to April; December brings the most, about 49 cm.
Snowfall by month
Centimetres
Heating a home in Saint-Jacques
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Degree days add up how far each day’s mean temperature falls below 18°C over a year.
Living with Saint-Jacques’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
The outdoor season by the averages is Jun, Jul, Aug and Sep, with highs of 17–27°C and lows of 8°C or more.
Parks & trails →About 44 days a year bring a wind chill under −20, when bare skin chills fast.
Plan shade and water for about 49 days a year above 30 on the humidex.
A typical year is calm by definition; Saint-Jacques’s hazards page covers the exceptions.
Flood & hazards →ECCC’s normals location: L'Assomption
Every temperature, frost, snow and degree-day figure on this page is the 1991–2020 normal ECCC publishes for L'Assomption.
| Distance from the town | 19 km south-east |
| Station altitude | 21 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Precipitation from | Fleury, 47 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, 47 km |
How Saint-Jacques 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
Places around Saint-Jacques whose figures come from another normals location. The nearest places to Saint-Jacques with figures are 32–34 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Jacques L'Assomption | 26.6°C | −16.0°C | 1,109 mm |
| Sainte-Sophie 32 km · Lachute | 26.5°C about the same | −14.7°C 1.3°C milder | 1,178 mm |
| Saint-Roch-de-Richelieu 32 km · Fleury | 26.0°C 0.6°C cooler | −14.8°C 1.2°C milder | 1,109 mm |
Saint-Jacques 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 Saint-Jacques’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: a location missing months of precipitation or snow is filled from the nearest that has them all, never mixed month by month.
- 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: hours of sunshine, missing from the 1991–2020 normals, and a height correction: the town has no elevation on file.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Saint-Jacques’s climate
How warm does Saint-Jacques get in summer?
The warmest month is July, when afternoons average 26.6°C.
How cold does Saint-Jacques get in winter?
Expect nights around −16.0°C in January; no month is colder.
How much rain and snow does Saint-Jacques get?
Rain and snow add up to about 1,109 mm of water a year; August brings the most (114 mm), February the least (61 mm).
Are these figures for Saint-Jacques itself?
Not directly: Saint-Jacques 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 Saint-Jacques →
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).