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Weather extremes
How extreme does Boston's weather get?
The hottest, coldest, wettest and snowiest days Boston 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 Boston has recorded — each shown against what a normal day that time of year looks like.
That is about 33°F hotter than a normal July afternoon in Boston (typical high near 72°F).
The three most extreme on record
About 26°F colder than a normal February night in Boston (typical low near 34°F).
The three most extreme on record
More rain in a single day than Boston usually gets in the whole month of March (typical March total about 1.5 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.
Boston's record heat sits well above even a hot day for the season — July's 105°F is about 33°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 30 years of daily observations at Coningsby, a weather station, about 16 km from the city centre. The underlying daily records come from NOAA's global station network.