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Weather extremes
How extreme does Thunder Bay's weather get?
The hottest, coldest, wettest and snowiest days Thunder Bay has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.
The four kinds of extreme
The hottest, coldest, wettest and snowiest single days Thunder Bay has recorded — each shown against what a normal day that time of year looks like.
That is about 20°F hotter than a normal July afternoon in Thunder Bay (typical high near 74°F).
The three most extreme on record
About 47°F colder than a normal December night in Thunder Bay (typical low near 7°F).
The three most extreme on record
More rain in a single day than Thunder Bay usually gets in the whole month of November (typical November total about 1.7 in).
The three most extreme on record
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.
Thunder Bay's record heat sits well above even a hot day for the season — July's 94°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
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 23 years of daily observations at Flint, a weather station, about 32 km from the city centre. The underlying daily records come from NOAA's global station network.