January in Saint-Nazaire bites harder than in 89% of Canadian towns
Midsummer highs settle at about 24.5°C. In July, afternoons here are cooler than in 67% of Canadian towns. Precipitation peaks in July and eases off in February. About 143 days a year bring 1 mm of precipitation or more.
The nearest ECCC normals location is Bagotville, 50 km south-east: at that distance its figures describe the region more than Saint-Nazaire itself.
A year in Saint-Nazaire at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Nazaire’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Nazaire feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 188 days, 20°C on 92
From September to May frost is routine, and in January it comes on almost every night. Some 43 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
928 mm of precipitation in a typical year
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 302 cm of snow a year
Expect snow from October to May, with about 65 cm in December, the snowiest month.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Saint-Nazaire
90% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Heating degree days total each day’s gap between its mean temperature and 18°C. Homes here need more heating than 83% of Canadian towns.
Living with Saint-Nazaire’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Frost usually lets go around 20 May and returns near 27 September, about 128 days apart.
The outdoor season by the averages is Jun, Jul and Aug, with highs of 17–27°C and lows of 8°C or more.
Parks & trails →Bitter wind chill, under −20, comes on about 76 days a year.
The air feels heavier than 30 on the humidex for about 23 days a year.
Severe weather is a separate story from the averages: see Saint-Nazaire’s hazards page.
Flood & hazards →ECCC’s normals location: Bagotville
Bagotville is one of the 450 places where ECCC publishes 1991–2020 normals.
| Distance from the town | 50 km south-east |
| Station altitude | 159 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | Yes |
| Coldest reading, 1991–2020 | −40.6°C |
| Hottest reading, 1991–2020 | 38.4°C |
| Average wind | 14.9 km/h on average, most often from the west |
| Next-nearest location | Roberval, 52 km |
How Saint-Nazaire 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-Nazaire whose figures come from another normals location.
Saint-Nazaire 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 | −9.7°C | −20.4°C | −15.1°C | 58 mm | 62 cm |
| February | −7.4°C | −18.7°C | −13.1°C | 48 mm | 52 cm |
| March | −0.7°C | −11.8°C | −6.3°C | 58 mm | 49 cm |
| April | 7.4°C | −3.2°C | 2.1°C | 61 mm | 23 cm |
| May | 16.6°C | 3.7°C | 10.2°C | 78 mm | 3 cm |
| June | 22.3°C | 9.6°C | 16.0°C | 89 mm | 0 cm |
| July | 24.5°C | 12.9°C | 18.7°C | 112 mm | 0 cm |
| August | 23.4°C | 11.8°C | 17.6°C | 100 mm | 0 cm |
| September | 18.2°C | 6.9°C | 12.6°C | 102 mm | 0 cm |
| October | 9.9°C | 1.4°C | 5.7°C | 92 mm | 8 cm |
| November | 2.3°C | −5.4°C | −1.5°C | 66 mm | 39 cm |
| December | −5.1°C | −13.9°C | −9.5°C | 64 mm | 65 cm |
| Year | 8.5°C | −2.3°C | 3.1°C | 928 mm | 302 cm |
The month with the widest range: March, −33.0°C to 25.2°C
January is the least predictable month: about two years in three its average lands within 3.2°C of the normal, −15.1°C. August is the steadiest, within 1.1°C.
Where Saint-Nazaire’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 normals from ECCC for Bagotville, its nearest location with complete temperatures.
- 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, absent from every 1991–2020 location, and an altitude correction, for want of the town’s own elevation.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Saint-Nazaire’s climate
How warm does Saint-Nazaire get in summer?
Midsummer means July, with afternoons near 24.5°C on a typical day.
How cold does Saint-Nazaire get in winter?
Overnight lows average −20.4°C in January, the coldest month.
How much rain and snow does Saint-Nazaire get?
A normal year brings 928 mm, snow included as water: July is wettest at 112 mm, February driest at 48 mm.
How long does snow stay on the ground?
In a normal winter there are about 156 days with at least 1 cm of snow lying.
Are these figures for Saint-Nazaire itself?
Not really: Bagotville, the closest location with normals, lies well away from Saint-Nazaire.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Nazaire →
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).