Photo: P199 · Public domain

Climate in L'Île-Perrot · ECCC 1991–2020 normals

July in L'Île-Perrot runs hotter than in 78% of Canadian towns

January mornings start at about −13.5°C. Temperatures cover 40°C across the year, low to high. Rain and snow together come to more here than on 74% of Canadian towns. For walks and days out, the stretch from May to September brings highs of 19–27°C.

July afternoons: warmer than 78% of Canadian towns

January nights: milder than 51% of Canadian towns

Rain and snow a year: wetter than 74% of Canadian towns

These are not L'Île-Perrot’s own readings: ECCC keeps no normals there, so the page uses Montréal Trudeau (Airport), 19 km north-east.

July high

26.7°C

Typical Canadian town 25.5°C

January low

−13.5°C

Typical Canadian town −13.5°C

Rain & snow a year

1,041 mm

Typical Canadian town 883 mm

Snowfall a year

217 cm

Typical Canadian town 141 cm

Frost days

146

a year at 0°C or below

Frost-free days

167

29 Apr to 14 Oct

A year in L'Île-Perrot at a glance

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

Jan−5°C−14°CColdest nightsSnowiest

Feb−3°C−12°C

Mar2°C−7°C

Apr11°C1°CLast frost ~29 Apr

May19°C8°C

Jun24°C14°C

Jul27°C17°CWarmest

Aug26°C16°C

Sep21°C11°C

Oct13°C5°CWettestFirst frost ~14 Oct

Nov now6°C−2°C

Dec−1°C−9°C

What stands out about L'Île-Perrot’s climate

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

Snowier than 80% of Canadian townsAbout 217 cm of snow falls in a year, most of it in January.Warmer than 78% of Canadian townsJuly afternoons average 26.7°C, the warmest of the year. 4th warmest of 513 towns of 2,500+ in Quebec.Wetter than 74% of Canadian townsAbout 1,041 mm of rain and melted snow a year; October is the wettest month and February the driest.

A normal year

What a year in L'Île-Perrot feels like

Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.

Winter

−3°C / −12°C

243 mm, with 147 cm of snow

Spring

11°C / 1°C

253 mm, with 52 cm of snow

Summer

26°C / 15°C

268 mm of rain and snow

Autumn

13°C / 5°C

277 mm, with 17 cm of snow: the wettest season

−20°

−10°

0°

10°

20°

30°

40°

−5°C−14°C

−3°C−12°C

2°C−7°C

11°C1°C

19°C8°C

24°C14°C

27°C17°C

26°C16°C

21°C11°C

13°C5°C

6°C−2°C

−1°C−9°C

JanFebMarAprMayJunJulAugSepOctNovDec

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

Frost & warm days

About 146 frosts and 121 warm days a year

From October to April frost is routine, and in January it comes on almost every night. Deep cold, under −20°C, comes on about 12 nights a year.

167 frost-free days · average dates, 1991–2020

29 Apr 14 Oct

JanFebMarAprMayJunJulAugSepOctNovDec

146

Frost days a year (0°C or below)

Fewer frosts than 65% of Canadian towns

Days that stay below 0°C

Nights a year below −20°C

121

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

1,041 mm of precipitation in a typical year

October is the wettest month and February the driest. On about 122 days a year, 1 mm or more falls.

1,041 mm

Rain and snow a year

Wetter than 74% of Canadian towns

818 mm

Of it as rain alone (79%)

103 mm

October, the wettest month

66 mm

February, the driest month

Rain and snow by month

Millimetres

103 mm

JFMAMJJASOND

Rain alone by month

Millimetres

102 mm

JFMAMJJASOND

Snow

About 217 cm of snow a year

From October to April snow is likely; January is the peak, at about 52 cm.

217 cm

Snowfall a year

Snowier than 80% of Canadian towns

Days a year with 0.2 cm of snow or more

101

Days a year with 1 cm or more on the ground

11 cm

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

Snowfall by month

Centimetres

52 cm

JFMAMJJASOND

Snow on the ground by month

Centimetres at month’s end

11 cm

JFMAMJJASOND

Heating

Heating a home in L'Île-Perrot

93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.

4,281 heating degree days (below 18°C)a year, 1991–2020

2,247 growing degree days (above 5°C)a year, 1991–2020

Heating degree days total each day’s gap between its mean temperature and 18°C. Homes here need less heating than 62% of Canadian towns.

Living here

Living with L'Île-Perrot’s climate

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

The garden window

Seedlings can go out once the average last frost, around 29 April, has passed; autumn’s first, near 14 October, ends a season of about 167 days.

Get outside

Plan time outside for May, Jun, Jul, Aug and Sep: highs of 17–27°C and nights no colder than 8°C.

Parks & trails →

Wind chill

Bitter wind chill, under −20, comes on about 40 days a year.

Humidex

A humidex above 30 marks about 50 days in a normal year.

Storms and extremes

Thirty years of averages say little about one bad storm; L'Île-Perrot’s hazards page does.

Flood & hazards →

Weather station

ECCC’s normals location: Montréal Trudeau (Airport)

ECCC builds the Montréal Trudeau (Airport) normals from 3 stations’ records over 1991–2020, joined where one replaced another.

Distance from the town	19 km north-east
Station altitude	36 m
Completeness	meets the WMO “3 and 5” rule
WMO standard normals	No
Coldest reading, 1991–2020	−31.8°C
Hottest reading, 1991–2020	36.6°C
Average wind	15.4 km/h on average, most often from the west
Next-nearest location	Lachute, 41 km

Compared with other towns

How L'Île-Perrot 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.

July afternoons26.7°C

L'Île-PerrotMedian Canadian town

18°C20°C22°C24°C26°C28°C

Warmer than 78% of Canadian towns4th warmest of 513 towns of 2,500+ in Quebec

January nights−13.5°C

L'Île-PerrotMedian Canadian town

−30°C−25°C−20°C−15°C−10°C−5°C

Milder than 51% of Canadian towns

Rain and snow a year1,041 mm

L'Île-PerrotMedian Canadian town

05001,0001,5002,000

Wetter than 74% of Canadian towns

Snowfall a year217 cm

L'Île-PerrotMedian Canadian town

100200300400

Snowier than 80% of Canadian towns

Next door

Nearby towns’ climate

Nearby places read from a different ECCC location (places on L'Île-Perrot’s own would show the same figures). L'Île-Perrot has few close neighbours with figures, so the list reaches 15–20 km out.

Town	July high	January low	Rain & snow
L'Île-Perrot Montréal Trudeau (Airport)	26.7°C	−13.5°C	1,041 mm
Saint-Lazare 15 km · Lachute	26.5°C about the same	−14.7°C 1.2°C colder	1,178 mm
Salaberry-de-Valleyfield 19 km · St-Anicet	26.7°C about the same	−13.0°C 0.5°C milder	1,047 mm

Month by month

L'Île-Perrot 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	−5.0°C	−13.5°C	−9.2°C	86 mm	52 cm
February	−3.4°C	−12.4°C	−8.0°C	66 mm	47 cm
March	2.4°C	−6.5°C	−2.0°C	77 mm	37 cm
April	11.3°C	1.1°C	6.2°C	90 mm	15 cm
May	19.4°C	8.3°C	13.9°C	86 mm	0 cm
June	24.2°C	13.8°C	19.0°C	84 mm	0 cm
July	26.7°C	16.7°C	21.7°C	91 mm	0 cm
August	25.7°C	15.6°C	20.6°C	94 mm	0 cm
September	21.1°C	10.9°C	16.0°C	89 mm	0 cm
October	13.2°C	4.5°C	8.9°C	103 mm	1 cm
November	6.1°C	−1.7°C	2.3°C	84 mm	16 cm
December	−1.2°C	−8.7°C	−5.0°C	92 mm	48 cm
Year	11.7°C	2.3°C	7.0°C	1,041 mm	217 cm

Year to year

Two years in three, January’s average lands within 3.0°C of normal, against the steadier June

March has the widest record range, −26.9°C in 1992 to 25.8°C in 2012; the tick on each bar is the month’s normal.

−40°

−30°

−20°

−10°

0°

10°

20°

30°

40°

JanFebMarAprMayJunJulAugSepOctNovDec

Record low to record high, 1991–2020Normal

Sources

Where L'Île-Perrot’s numbers come from

Averages over 30 years, not a forecast.

Normals: the 1991–2020 normals from ECCC for Montréal Trudeau (Airport), its nearest location with complete temperatures.
Comparisons: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
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 L'Île-Perrot’s climate

How warm does L'Île-Perrot get in summer?

Expect highs near 26.7°C in July, the hottest month on average.

How cold does L'Île-Perrot get in winter?

The year’s coldest nights belong to January, at about −13.5°C.

How much rain and snow does L'Île-Perrot get?

October is the wettest month at 103 mm and February the driest at 66 mm, for 1,041 mm over the year.

How long does snow stay on the ground?

The ground is white, with 1 cm or more, on some 101 days a year.

Are these figures for L'Île-Perrot itself?

No. ECCC measures normals at Montréal Trudeau (Airport), not in L'Île-Perrot; the page uses the nearest it has.

Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for L'Île-Perrot →

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).