Lac-Supérieur gets more frosts than 89% of Canadian towns
Peak summer warmth arrives in July, with afternoons near 25.3°C. Its yearly rain and snow top those of 88% of Canadian towns. Seasons differ by 44°C, from the coldest nights to the warmest afternoons. Warm coats and heating bills mark the months from October to April, when means dip under 10°C.
No ECCC station in Lac-Supérieur has 1991–2020 normals; the page reads St-Jovite, 14 km south-west, instead.
A year in Lac-Supérieur at a glance
Each month’s typical high and low, in °C.
What stands out about Lac-Supérieur’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Lac-Supérieur feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
196 frost days and 111 days above 20°C a year
The frost season runs September to May, and January freezes nearly every night. Some 41 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
1,178 mm of precipitation in a typical year
The most falls in October, the least in February. Some 143 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 St-Jovite normals leave out precipitation and snow; both come from Lachute here, 57 km away.
Snowfall: about 218 cm in a normal year
Expect snow from October to April, with about 56 cm in January, the snowiest month.
Snowfall by month
Centimetres
Heating a home in Lac-Supérieur
89% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
A day averaging 10 degrees under 18°C adds 10 to the total; warm days add nothing. By this count, homes here need more heating than 80% of Canadian towns.
Living with Lac-Supérieur’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
A normal year gives the garden about 110 frost-free days, roughly 28 May to 15 September.
Afternoons of 17–27°C and nights of at least 8°C arrive in Jun, Jul and Aug.
Parks & trails →Frostbite weather, a wind chill under −20, turns up on about 34 days a year.
Expect around 35 sticky days a year with the humidex above 30.
A normal year has no blizzard, flood or heat wave in it; Lac-Supérieur’s hazards page looks at those.
Flood & hazards →ECCC’s normals location: St-Jovite
The page’s figures are ECCC’s 1991–2020 normals for St-Jovite, one of its 450 normals locations.
| Distance from the town | 14 km south-west |
| Station altitude | 234 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Precipitation from | Lachute, 57 km |
| Coldest reading, 1991–2020 | −41.4°C |
| Hottest reading, 1991–2020 | 35.7°C |
| Average wind | 4.1 km/h on average, most often from the west |
| Next-nearest location | Lachute, 57 km |
How Lac-Supérieur compares
Placed among 2,611 Canadian towns and neighbourhoods of 2,500+, each on its nearest normals location; each dot is another location used in Quebec.
Nearby towns’ climate
Places around Lac-Supérieur whose figures come from another normals location. No closer place has figures: this one lies 32 km from Lac-Supérieur.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Lac-Supérieur St-Jovite | 25.3°C | −18.3°C | 1,178 mm |
| Morin-Heights 32 km · Lachute | 26.5°C 1.2°C warmer | −14.7°C 3.6°C milder | 1,178 mm |
Lac-Supérieur weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −5.5°C | −18.3°C | −11.9°C | 97 mm | 56 cm |
| February | −3.3°C | −17.9°C | −10.6°C | 72 mm | 47 cm |
| March | 2.6°C | −11.3°C | −4.4°C | 74 mm | 34 cm |
| April | 10.3°C | −3.2°C | 3.5°C | 100 mm | 8 cm |
| May | 18.5°C | 3.3°C | 11.0°C | 89 mm | 0 cm |
| June | 23.0°C | 8.5°C | 15.7°C | 111 mm | 0 cm |
| July | 25.3°C | 10.9°C | 18.2°C | 112 mm | 0 cm |
| August | 24.5°C | 9.8°C | 17.2°C | 104 mm | 0 cm |
| September | 20.1°C | 5.6°C | 12.9°C | 114 mm | 0 cm |
| October | 12.3°C | 0.5°C | 6.4°C | 120 mm | 2 cm |
| November | 4.6°C | −5.1°C | −0.2°C | 93 mm | 17 cm |
| December | −2.5°C | −12.9°C | −7.7°C | 94 mm | 53 cm |
| Year | 10.8°C | −2.5°C | 4.2°C | 1,178 mm | 218 cm |
March has run from −38.3°C to 27.1°C in thirty years
The month to count on least is January: one year in three its average strays more than 3.2°C from −11.9°C. August moves least, typically by 1.0°C.
Where Lac-Supérieur’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for St-Jovite, 1991–2020, chosen as the nearest location with a full temperature record.
- Other locations: precipitation and snowfall come from the nearest location that publishes all twelve months of them, as named above.
- Comparisons: the 2,500-plus towns and neighbourhoods of Canada, each read from its closest normals location; whole cities and reserves aren’t counted.
- Not on this page: a sunshine figure (ECCC published none for 1991–2020) and any lapse-rate correction for height, as the town has no elevation here.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Lac-Supérieur’s climate
How warm does Lac-Supérieur get in summer?
Peak warmth comes in July, at about 25.3°C by mid-afternoon.
How cold does Lac-Supérieur get in winter?
A typical January night falls to −18.3°C, the year’s low point.
How much rain and snow does Lac-Supérieur get?
The year adds up to 1,178 mm. October is the peak month (120 mm) and February the low one (72 mm).
Are these figures for Lac-Supérieur itself?
Not as such: St-Jovite is the nearest normals location, and Lac-Supérieur has none.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Lac-Supérieur →
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).