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Weather extremes

How extreme does Saint-Hyacinthe's weather get?

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

Based on 18 years of daily weather observations (2008–present), from the Saint-Germain-De-Grantham station 40 km away. Updated through May 2026 — 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 Saint-Hyacinthe has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
96°F May 27, 2020

That is about 29°F hotter than a normal May afternoon in Saint-Hyacinthe (typical high near 67°F).

The three most extreme on record

1 96°F May 27, 2020
2 94°F Jul 10, 2020
3 93°F Jun 23, 2025
❄️ Coldest night
-39°F Jan 22, 2022

About 43°F colder than a normal January night in Saint-Hyacinthe (typical low near 4°F).

The three most extreme on record

1 -39°F Jan 22, 2022recent
2 -38°F Jan 26, 2009
3 -37°F Jan 21, 2014
🌧️ Most rain in one day
4.13 in Aug 28, 2011

About 93% of a typical August's rain in a single day (Saint-Hyacinthe averages roughly 4.4 in across the month).

The three most extreme on record

1 4.13 in Aug 28, 2011
2 2.73 in Oct 15, 2010
3 2.54 in Jun 24, 2014

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 96°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Saint-Hyacinthe's record heat sits well above even a hot day for the season — May's 96°F is about 29°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, Saint-Hyacinthe's warmest days reach the high 70s°F and its coldest nights drop to the mid-0s°F. But across the record it has gone as high as 96°F and as low as −39°F. A single day has delivered over 4 inches of rain. 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 28 years of daily observations at ST Hyacinthe 2, a weather station, about 7 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →