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Weather extremes

How extreme does Innisfil's weather get?

The hottest, coldest, wettest and snowiest days Innisfil has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 25 years of daily weather observations (2000–present), from the Egbert Cs station 13 km away. Updated through August 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Innisfil has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
99°F Aug 8, 2001

That is about 21°F hotter than a normal August afternoon in Innisfil (typical high near 78°F).

The three most extreme on record

1 99°F Aug 8, 2001
2 98°F Aug 1, 2006
3 97°F Aug 9, 2001
❄️ Coldest night
-26°F Feb 14, 2016

About 38°F colder than a normal February night in Innisfil (typical low near 12°F).

The three most extreme on record

1 -26°F Feb 14, 2016
2 -25°F Jan 10, 2004
3 -25°F Dec 20, 2004
🌧️ Most rain in one day
5.86 in Aug 2, 2020

More rain in a single day than Innisfil usually gets in the whole month of August (typical August total about 3.3 in).

The three most extreme on record

1 5.86 in Aug 2, 2020
2 2.65 in Feb 23, 2022
3 2.54 in Jan 11, 2020
Most snow in one day
12.2 in Dec 5, 2010

The three most extreme on record

1 12.2 in Dec 5, 2010
2 9.8 in Jan 19, 2007
3 9.4 in Dec 14, 2010

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

-50°-30°-10°10°30°50°70°90°110° all-time high 99°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Innisfil's record heat sits well above even a hot day for the season — August's 99°F is about 21°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Innisfil's warmest days reach the high 70s°F and its coldest nights drop to the low 10s°F. But across the record it has gone as high as 99°F and as low as −26°F. A single day has delivered over 6 inches of rain or close to 12 inches of snow. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Shanty Bay, a weather station, about 11 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →