Photo: Mario Roy · CC BY 3.0

Climate in Sainte-Justine · ECCC 1991–2020 normals

Sainte-Justine is wetter than 92% of Canadian towns: 1,284 mm of rain and snow a year

Deep winter brings January lows near −17.5°C. Seasons differ by 41°C, from the coldest nights to the warmest afternoons. Frosty nights outnumber those of 89% of Canadian towns. From June to August, highs of 21–24°C make it easy to spend the day outdoors.

July afternoons: cooler than 80% of Canadian towns

January nights: colder than 82% of Canadian towns

Rain and snow a year: wetter than 92% of Canadian towns

These are not Sainte-Justine’s own readings: ECCC keeps no normals there, so the page uses St Camille, 13 km north-east.

July high

23.5°C

Typical Canadian town 25.5°C

January low

−17.5°C

Typical Canadian town −13.5°C

Rain & snow a year

1,284 mm

Typical Canadian town 883 mm

Snowfall a year

367 cm

Typical Canadian town 141 cm

Frost days

197

a year at 0°C or below

A year in Sainte-Justine at a glance

Each month’s typical high and low, in °C.

Jan−8°C−18°CColdest nights

Feb−6°C−17°C

Mar0°C−11°C

Apr7°C−3°C

May16°C4°C

Jun21°C9°C

Jul24°C12°CWarmestWettest

Aug23°C11°C

Sep18°C6°C

Oct10°C1°C

Nov now3°C−5°C

Dec−4°C−12°CSnowiest

What stands out about Sainte-Justine’s climate

Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.

Snowier than almost every Canadian townAbout 367 cm of snow falls in a year, most of it in December. 5th snowiest of 494 towns of 2,500+ in Quebec.Wetter than 92% of Canadian townsAbout 1,284 mm of rain and melted snow a year; July is the wettest month and February the driest.Colder than 82% of Canadian townsJanuary nights average −17.5°C, the coldest of the year.

A normal year

What a year in Sainte-Justine feels like

Each season’s and each month’s usual high and low, 1991–2020.

Winter

−6°C / −15°C

300 mm, with 230 cm of snow

Spring

8°C / −3°C

279 mm, with 97 cm of snow

Summer

22°C / 10°C

388 mm of rain and snow, the wettest season

Autumn

10°C / 1°C

317 mm, with 40 cm of snow

−30°

−20°

−10°

0°

10°

20°

30°

−8°C−18°C

−6°C−17°C

0°C−11°C

7°C−3°C

16°C4°C

21°C9°C

24°C12°C

23°C11°C

18°C6°C

10°C1°C

3°C−5°C

−4°C−12°C

JanFebMarAprMayJunJulAugSepOctNovDec

Best months to be outsideJunJulAugHighs of 17–27°C and nights of 8°C or more

Frost & warm days

197 frost days and 85 days above 20°C a year

The frost season runs September to May, and January freezes nearly every night. Some 32 nights a year drop under −20°C.

197

Frost days a year (0°C or below)

More frosts than 89% of Canadian towns

104

Days that stay below 0°C

Nights a year below −20°C

Days a year above 20°C

Days a year above 30°C

Frost days by month

Average days at 0°C or below

JFMAMJJASOND

Days above 20°C by month

Average days

JFMAMJJASOND

Rain & snow

1,284 mm of precipitation in a typical year

July is the wettest month and February the driest. Some 157 days a year see 1 mm of rain or snow or more.

1,284 mm

Rain and snow a year

Wetter than 92% of Canadian towns

913 mm

Of it as rain alone (71%)

140 mm

July, the wettest month

85 mm

February, the driest month

Rain and snow by month

Millimetres

140 mm

JFMAMJJASOND

Rain alone by month

Millimetres

140 mm

JFMAMJJASOND

Snow

367 cm of snow in a typical year

Expect snow from October to May, with about 81 cm in December, the snowiest month. 5th snowiest of 494 towns of 2,500+ in Quebec.

367 cm

Snowfall a year

Snowier than almost every Canadian town

Days a year with 0.2 cm of snow or more

155

Days a year with 1 cm or more on the ground

69 cm

Snow on the ground at the end of February, the deepest month

Snowfall by month

Centimetres

81 cm

JFMAMJJASOND

Snow on the ground by month

Centimetres at month’s end

69 cm

JFMAMJJASOND

Heating

Heating a home in Sainte-Justine

88% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.

5,436 heating degree days (below 18°C)a year, 1991–2020

1,505 growing degree days (above 5°C)a year, 1991–2020

Degree days add up how far each day’s mean temperature falls below 18°C over a year. In heating terms, homes need more heating than 83% of Canadian towns.

Living here

Living with Sainte-Justine’s climate

The averages read for the garden, the outdoors and the coldest and hottest days.

Get outside

Afternoons of 17–27°C and nights of at least 8°C arrive in Jun, Jul and Aug.

Parks & trails →

Storms and extremes

Averages smooth over blizzards, ice storms, floods and heat waves; Sainte-Justine’s hazards page covers the risks.

Flood & hazards →

Weather station

ECCC’s normals location: St Camille

Every temperature, frost, snow and degree-day figure on this page is the 1991–2020 normal ECCC publishes for St Camille.

Distance from the town	13 km north-east
Station altitude	396 m
Completeness	at least 20 years
WMO standard normals	No
Coldest reading, 1991–2020	−42.5°C
Hottest reading, 1991–2020	33.3°C
Next-nearest location	St Georges, 39 km

Compared with other towns

How Sainte-Justine compares

Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Quebec.

July afternoons23.5°C

Sainte-JustineMedian Canadian town

18°C20°C22°C24°C26°C28°C

Cooler than 80% of Canadian towns

January nights−17.5°C

Sainte-JustineMedian Canadian town

−30°C−25°C−20°C−15°C−10°C−5°C

Colder than 82% of Canadian towns

Rain and snow a year1,284 mm

Sainte-JustineMedian Canadian town

05001,0001,5002,000

Wetter than 92% of Canadian towns

Snowfall a year367 cm

Sainte-JustineMedian Canadian town

100200300400

Snowier than almost every Canadian town5th snowiest of 494 towns of 2,500+ in Quebec

Next door

Nearby towns’ climate

Nearby places read from a different ECCC location (places on Sainte-Justine’s own would show the same figures). The nearest places to Sainte-Justine with figures are 24–30 km away.

Town	July high	January low	Rain & snow
Sainte-Justine St Camille	23.5°C	−17.5°C	1,284 mm
Saint-Odilon-de-Cranbourne 24 km · St Georges	25.3°C 1.8°C warmer	−16.7°C 0.8°C milder	1,054 mm
Saint-Fabien-de-Panet 30 km · Ste Lucie	23.9°C about the same	−19.6°C 2.1°C colder	1,284 mm

Month by month

Sainte-Justine 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	−7.8°C	−17.5°C	−13.0°C	99 mm	74 cm
February	−5.6°C	−16.5°C	−11.1°C	85 mm	75 cm
March	0.2°C	−10.9°C	−5.4°C	94 mm	63 cm
April	7.2°C	−3.0°C	2.3°C	94 mm	31 cm
May	16.2°C	3.8°C	10.0°C	92 mm	3 cm
June	21.2°C	8.9°C	15.1°C	132 mm	0 cm
July	23.5°C	11.8°C	17.4°C	140 mm	0 cm
August	22.5°C	10.6°C	16.5°C	117 mm	0 cm
September	18.1°C	6.3°C	12.2°C	105 mm	under 1 cm
October	10.1°C	0.6°C	5.4°C	122 mm	9 cm
November	2.5°C	−5.3°C	−1.3°C	90 mm	31 cm
December	−4.2°C	−12.4°C	−8.4°C	116 mm	81 cm
Year	8.6°C	−2.0°C	3.3°C	1,284 mm	367 cm

Year to year

January varies most from one year to the next (3.0°C), June least

Over 1991–2020, January saw both −42.5°C (2009) and 18.5°C (1995), the widest span of any month.

−50°

−40°

−30°

−20°

−10°

0°

10°

20°

30°

40°

JanFebMarAprMayJunJulAugSepOctNovDec

Record low to record high, 1991–2020Normal

Sources

Where Sainte-Justine’s numbers come from

Averages over 30 years, not a forecast.

Normals: the 1991–2020 normals from ECCC for St Camille, its nearest location with complete temperatures.
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: sunshine (no 1991–2020 normals exist for it) and any altitude adjustment, since there is no elevation for the town itself.

Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada

Questions about Sainte-Justine’s climate

How warm does Sainte-Justine get in summer?

Midsummer means July, with afternoons near 23.5°C on a typical day.

How cold does Sainte-Justine get in winter?

A typical January night falls to −17.5°C, the year’s low point.

How much rain and snow does Sainte-Justine get?

The year adds up to 1,284 mm. July is the peak month (140 mm) and February the low one (85 mm).

How long does snow stay on the ground?

Roughly 155 days a year start with snow cover of 1 cm or more.

Are these figures for Sainte-Justine itself?

They are the closest available: the normals for St Camille, since Sainte-Justine has none.

Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Sainte-Justine →

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).