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Weather extremes

How extreme does Edgartown's weather get?

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

Based on 50+ years of daily weather observations (1971–present), from the Hyannis station 35 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 Edgartown has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
99°F Sep 4, 2007

That is about 28°F hotter than a normal September afternoon in Edgartown (typical high near 71°F).

The three most extreme on record

1 99°F Sep 4, 2007
2 98°F Jul 6, 1999
3 96°F Jul 16, 1983
❄️ Coldest night
-10°F Dec 25, 1983

About 39°F colder than a normal December night in Edgartown (typical low near 29°F).

The three most extreme on record

1 -10°F Dec 25, 1983
2 -9°F Feb 14, 2016
3 -8°F Jan 16, 2004
🌧️ Most rain in one day
40.00 in May 18, 1982

More rain in a single day than Edgartown usually gets in the whole month of May (typical May total about 3.4 in).

The three most extreme on record

1 40.00 in May 18, 1982
2 6.04 in Sep 4, 2010
3 4.76 in Aug 10, 1992
Most snow in one day
24.0 in Jan 23, 2005

Close to a whole typical January's snow in one day (Edgartown averages about 10 in across the month).

The three most extreme on record

1 24.0 in Jan 23, 2005
2 16.0 in Jan 27, 2015
3 12.6 in Jan 24, 2016

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.

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

Edgartown's record heat sits well above even a hot day for the season — September's 99°F is about 28°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, Edgartown's warmest days reach the high 70s°F and its coldest nights drop to the low 20s°F. But across the record it has gone as high as 99°F and as low as −10°F. A single day has delivered over 40 inches of rain or close to 24 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 — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Hyannis (NOAA GHCN station USC00193821), about 35 km from the city centre.

How we build these numbers →