How extreme does Greater Sudbury's weather get?

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

Based on 49 years of daily weather observations (1977–present), from the Sudbury Climate station 22 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 Greater Sudbury has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

97°F Jul 8, 1988

That is about 20°F hotter than a normal July afternoon in Greater Sudbury (typical high near 77°F).

The three most extreme on record

1 97°F Jul 8, 1988

2 95°F Jul 30, 1988

3 93°F Jul 6, 1988

❄️ Coldest night

-36°F Jan 23, 2013

About 38°F colder than a normal January night in Greater Sudbury (typical low near 2°F).

The three most extreme on record

1 -36°F Jan 23, 2013

2 -35°F Feb 17, 1979

3 -35°F Feb 18, 1979

🌧️ Most rain in one day

6.81 in May 18, 1982

More rain in a single day than Greater Sudbury usually gets in the whole month of May (typical May total about 2.7 in).

The three most extreme on record

1 6.81 in May 18, 1982

2 4.17 in May 6, 1994

3 4.02 in Nov 22, 1994

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.

normal range of daily temperatureshottest ever recordedcoldest ever recorded

Greater Sudbury's record heat sits well above even a hot day for the season — July's 97°F is about 20°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, Greater Sudbury's warmest days reach the high 70s°F and its coldest nights drop to the low 0s°F. But across the record it has gone as high as 97°F and as low as −36°F. A single day has delivered over 7 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 22 years of daily observations at Sudbury A, a weather station, about 21 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →

← Greater Sudbury city detail