Photo: P199 · CC BY-SA 3.0

Climate in Innisfil · ECCC 1991–2020 normals

In Innisfil, July heat, January cold and precipitation all sit near the middle of Canadian towns

A typical July afternoon reaches 26.0°C, a January night drops to −11.3°C, and 793 mm of rain and snow falls in a year. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 37°C apart. It is a dry place: less rain and snow fall here than on 65% of Canadian towns. Windshields need scraping on about 155 mornings a year, the days the air reaches 0°C or below.

July afternoons: warmer than 61% of Canadian towns

January nights: milder than 62% of Canadian towns

Rain and snow a year: drier than 65% of Canadian towns

Borrowed figures: Innisfil has no normals station, so these come from Egbert, 19 km south-west.

July high

26.0°C

Typical Canadian town 25.5°C

January low

−11.3°C

Typical Canadian town −13.5°C

Rain & snow a year

793 mm

Typical Canadian town 883 mm

Snowfall a year

174 cm

Typical Canadian town 141 cm

Frost days

155

a year at 0°C or below

Frost-free days

141

16 May to 5 Oct

A year in Innisfil at a glance

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

Jan−3°C−11°CColdest nights

Feb−2°C−11°C

Mar3°C−6°C

Apr11°C0°C

May18°C6°CLast frost ~16 May

Jun23°C12°CWettest

Jul26°C14°CWarmest

Aug25°C13°C

Sep21°C10°C

Oct14°C4°CFirst frost ~5 Oct

Nov now6°C−1°C

Dec0°C−7°CSnowiest

What stands out about Innisfil’s climate

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

Drier than 65% of Canadian townsAbout 793 mm of rain and melted snow a year; June is the wettest month and February the driest.Snowier than 63% of Canadian townsAbout 174 cm of snow falls in a year, most of it in December.Milder than 62% of Canadian townsJanuary nights average −11.3°C, the coldest of the year.

A normal year

What a year in Innisfil feels like

Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.

Winter

−2°C / −10°C

157 mm, with 115 cm of snow

Spring

11°C / 0°C

183 mm, with 35 cm of snow

Summer

25°C / 13°C

244 mm of rain and snow, the wettest season

Autumn

14°C / 4°C

210 mm, with 25 cm of snow

−20°

−10°

0°

10°

20°

30°

−3°C−11°C

−2°C−11°C

3°C−6°C

11°C0°C

18°C6°C

23°C12°C

26°C14°C

25°C13°C

21°C10°C

14°C4°C

6°C−1°C

0°C−7°C

JanFebMarAprMayJunJulAugSepOctNovDec

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

Frost & warm days

Frost on 155 days, 20°C on 114

From October to May frost is routine, and in January it comes on almost every night. Some 9 nights a year drop under −20°C.

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

16 May 5 Oct

JanFebMarAprMayJunJulAugSepOctNovDec

155

Frost days a year (0°C or below)

Fewer frosts than 54% of Canadian towns

Days that stay below 0°C

Nights a year below −20°C

114

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

793 mm of precipitation in a typical year

June brings the most rain and snow; February, the least. About 115 days a year bring 1 mm or more.

793 mm

Rain and snow a year

Drier than 65% of Canadian towns

632 mm

Of it as rain alone (80%)

83 mm

June, the wettest month

45 mm

February, the driest month

Rain and snow by month

Millimetres

83 mm

JFMAMJJASOND

Rain alone by month

Millimetres

84 mm

JFMAMJJASOND

Snow

About 174 cm of snow a year

The snow season runs October to April; December brings the most, about 42 cm.

174 cm

Snowfall a year

Snowier than 63% of Canadian towns

Days a year with 0.2 cm of snow or more

Snowfall by month

Centimetres

42 cm

JFMAMJJASOND

Heating

Heating a home in Innisfil

91% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.

4,279 heating degree days (below 18°C)a year, 1991–2020

2,045 growing degree days (above 5°C)a year, 1991–2020

Warm days count for nothing; each colder day adds how far its mean sits below 18°C. By this count, homes here need less heating than 65% of Canadian towns.

Living here

Living with Innisfil’s climate

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

The garden window

Between the last frost, near 16 May, and the first, near 5 October, lie about 141 frost-free days.

Get outside

Warm afternoons without cold nights, 17–27°C and 8°C or more, mark Jun, Jul, Aug and Sep.

Parks & trails →

Wind chill

Count on some 26 days a year when the wind makes it feel below −20.

Humidex

Humid summer days, the humidex above 30, number about 49 a year.

Storms and extremes

Bad-weather days, from blizzards to floods, get their own page for Innisfil: the hazards page.

Flood & hazards →

Weather station

ECCC’s normals location: Egbert

Egbert is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.

Distance from the town	19 km south-west
Station altitude	251 m
Completeness	meets the WMO “3 and 5” rule
WMO standard normals	No
Coldest reading, 1991–2020	−35.5°C
Hottest reading, 1991–2020	36.5°C
Average wind	11.3 km/h on average, most often from the south
Next-nearest location	Udora, 33 km

Compared with other towns

How Innisfil 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 Ontario.

July afternoons26.0°C

InnisfilMedian Canadian town

20°C22°C24°C26°C28°C30°C

Warmer than 61% of Canadian towns

January nights−11.3°C

InnisfilMedian Canadian town

−25°C−20°C−15°C−10°C−5°C

Milder than 62% of Canadian towns

Rain and snow a year793 mm

InnisfilMedian Canadian town

05001,0001,5002,000

Drier than 65% of Canadian towns

Snowfall a year174 cm

InnisfilMedian Canadian town

0100200300400

Snowier than 63% of Canadian towns

Next door

Nearby towns’ climate

Places around Innisfil whose figures come from another normals location. Innisfil has few close neighbours with figures, so the list reaches 12–29 km out.

Town	July high	January low	Rain & snow
Innisfil Egbert	26.0°C	−11.3°C	793 mm
Keswick 12 km · Udora	26.3°C about the same	−11.7°C about the same	883 mm
Oro-Medonte 27 km · Lagoon City	24.5°C 1.5°C cooler	−12.6°C 1.3°C colder	793 mm
Newmarket 29 km · Toronto Buttonville (Airport)	27.3°C 1.3°C warmer	−10.1°C 1.2°C milder	862 mm

Month by month

Innisfil 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	−2.9°C	−11.3°C	−7.2°C	55 mm	40 cm
February	−2.0°C	−10.8°C	−6.4°C	45 mm	33 cm
March	3.2°C	−5.9°C	−1.3°C	48 mm	26 cm
April	10.9°C	0.3°C	5.6°C	62 mm	9 cm
May	18.4°C	6.2°C	12.3°C	74 mm	under 1 cm
June	23.4°C	11.5°C	17.5°C	83 mm	0 cm
July	26.0°C	14.2°C	20.1°C	78 mm	0 cm
August	25.0°C	13.3°C	19.2°C	83 mm	0 cm
September	21.1°C	9.5°C	15.3°C	72 mm	0 cm
October	13.6°C	4.1°C	8.9°C	65 mm	3 cm
November	6.4°C	−1.1°C	2.7°C	72 mm	22 cm
December	0.3°C	−6.6°C	−3.2°C	58 mm	42 cm
Year	11.9°C	2.0°C	7.0°C	793 mm	174 cm

Year to year

In March, anything from −29.0°C to 26.5°C

January is the least predictable month: about two years in three its average lands within 3.1°C of the normal, −7.2°C. August is the steadiest, within 1.2°C.

−40°

−30°

−20°

−10°

0°

10°

20°

30°

40°

JanFebMarAprMayJunJulAugSepOctNovDec

Record low to record high, 1991–2020Normal

Sources

Where Innisfil’s numbers come from

Averages over 30 years, not a forecast.

Normals: the Canadian Climate Normals, 1991–2020, at Egbert (the closest location with all twelve months of temperatures).
Comparisons: a pool of Canadian towns and neighbourhoods of 2,500 or more, read alike; whole cities and reserves stay out of it.
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 Innisfil’s climate

How warm does Innisfil get in summer?

Of all twelve months, July has the warmest afternoons, about 26.0°C.

How cold does Innisfil get in winter?

Deep winter means January, when nights average −11.3°C.

How much rain and snow does Innisfil get?

Over twelve months, rain and melted snow come to 793 mm; the range runs from 45 mm in February to 83 mm in June.

Are these figures for Innisfil itself?

Only indirectly: the readings are made at Egbert, outside Innisfil.

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

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).