More rain and snow fall on Saint-Louis than on 87% of Canadian towns: 1,173 mm a year
On a normal July day the thermometer tops out near 25.1°C. A year here swings 41°C from midwinter lows to midsummer highs. By January nights alone, it runs colder than 73% of Canadian towns. Expect about 162 frosty starts a year, days when the air falls to freezing.
Saint-Louis has no ECCC normals station of its own: every figure here comes from Ste-Foy (U. Laval), 2.9 km north-west.
A year in Saint-Louis at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Louis’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Louis feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 162 days, 20°C on 101
Frost comes from October to May; in January almost every night freezes. Some 21 nights a year drop under −20°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 1,173 mm of rain and snow a year
July is the wettest month and February the driest. Some 135 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Ste-Foy (U. Laval) publishes no full year of precipitation, so these figures come from Québec Jean Lesage (Airport), 7.8 km away.
331 cm of snow in a typical year
From October to April snow is likely; December is the peak, at about 89 cm.
Snowfall by month
Centimetres
ECCC’s Ste-Foy (U. Laval) normals leave snowfall out; the figures here come from Beauséjour, 14 km away.
Heating a home in Saint-Louis
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Think of it as a year’s worth of daily shortfalls below 18°C, added up.
Living with Saint-Louis’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
The comfortable months for a day outside, highs of 17–27°C and nights of 8°C or more: Jun, Jul, Aug and Sep.
Parks & trails →A wind chill below −20 is part of about 39 days a year here.
Humid heat, a humidex over 30, comes on about 31 days a year.
Averages smooth over blizzards, ice storms, floods and heat waves; Saint-Louis’s hazards page covers the risks.
Flood & hazards →ECCC’s normals location: Ste-Foy (U. Laval)
ECCC builds the Ste-Foy (U. Laval) normals from 2 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 2.9 km north-west |
| Station altitude | 79 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Precipitation from | Québec Jean Lesage (Airport), 7.8 km |
| Snowfall from | Beauséjour, 14 km |
| Coldest reading, 1991–2020 | −33.8°C |
| Hottest reading, 1991–2020 | 35.3°C |
| Average wind | 9.9 km/h on average, most often from the south-west |
| Next-nearest location | Québec Jean Lesage (Airport), 7.8 km |
How Saint-Louis 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-Louis whose figures come from another normals location. The nearest places to Saint-Louis with figures are 7–18 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Louis Ste-Foy (U. Laval) | 25.1°C | −15.6°C | 1,173 mm |
| L'Ancienne-Lorette 6.6 km · Québec Jean Lesage (Airport) | 25.0°C about the same | −16.7°C 1.1°C colder | 1,173 mm |
| Sainte-Pétronille 17 km · Lauzon | 24.9°C about the same | −16.6°C 1.0°C colder | 1,216 mm |
| Saint-Henri 18 km · Beauséjour | 25.5°C about the same | −16.8°C 1.2°C colder | 1,299 mm |
Saint-Louis weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −7.1°C | −15.6°C | −11.3°C | 87 mm | 71 cm |
| February | −4.8°C | −14.4°C | −9.6°C | 66 mm | 71 cm |
| March | 0.8°C | −8.4°C | −3.8°C | 78 mm | 55 cm |
| April | 8.4°C | −0.6°C | 4.0°C | 94 mm | 16 cm |
| May | 17.5°C | 6.5°C | 12.0°C | 92 mm | under 1 cm |
| June | 22.5°C | 11.7°C | 17.1°C | 115 mm | 0 cm |
| July | 25.1°C | 14.8°C | 20.0°C | 119 mm | 0 cm |
| August | 24.2°C | 13.9°C | 19.1°C | 109 mm | 0 cm |
| September | 19.4°C | 9.2°C | 14.3°C | 111 mm | 0 cm |
| October | 11.1°C | 3.2°C | 7.2°C | 116 mm | 4 cm |
| November | 4.0°C | −2.7°C | 0.7°C | 91 mm | 25 cm |
| December | −3.2°C | −10.2°C | −6.7°C | 96 mm | 89 cm |
| Year | 9.8°C | 0.6°C | 5.2°C | 1,173 mm | 331 cm |
A March here can run from −27.7°C to 20.4°C
Two years in three, January’s average falls within 2.8°C of its normal of −11.3°C; August keeps to within 1.0°C.
Where Saint-Louis’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for Ste-Foy (U. Laval), 1991–2020, chosen as the nearest location with a full temperature record.
- 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: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest location.
- 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-Louis’s climate
How warm does Saint-Louis get in summer?
Expect highs near 25.1°C in July, the hottest month on average.
How cold does Saint-Louis get in winter?
Overnight lows average −15.6°C in January, the coldest month.
How much rain and snow does Saint-Louis get?
Rain and snow, with snow counted as water, total 1,173 mm a year; July leads with 119 mm and February trails with 66 mm.
Are these figures for Saint-Louis itself?
Not directly: Saint-Louis has no ECCC normals of its own, and Ste-Foy (U. Laval) stands in for it.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Louis →
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).