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Weather extremes

How extreme does Lexington's weather get?

The hottest, coldest, wettest and snowiest days Lexington 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 Jamaica Plain station 18 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 Lexington has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
103°F Jul 22, 1977

That is about 18°F hotter than a normal July afternoon in Lexington (typical high near 85°F).

The three most extreme on record

1 103°F Jul 22, 1977
2 103°F Jun 25, 2025
3 101°F Sep 1, 1973
❄️ Coldest night
-11°F Feb 4, 2023

About 32°F colder than a normal February night in Lexington (typical low near 21°F).

The three most extreme on record

1 -11°F Feb 4, 2023recent
2 -10°F Dec 26, 1980
3 -10°F Jan 22, 1984
🌧️ Most rain in one day
7.15 in Jun 14, 1998

More rain in a single day than Lexington usually gets in the whole month of June (typical June total about 4.2 in).

The three most extreme on record

1 7.15 in Jun 14, 1998
2 5.45 in Sep 18, 1996
3 4.75 in Sep 2, 2021
Most snow in one day
22.0 in Feb 7, 1978

The three most extreme on record

1 22.0 in Feb 7, 1978
2 20.0 in Feb 10, 2013
3 18.0 in Jan 28, 2015

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°130° all-time high 103°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Lexington's record heat sits well above even a hot day for the season — July's 103°F is about 18°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, Lexington's warmest days reach the mid-80s°F and its coldest nights drop to the high 10s°F. But across the record it has gone as high as 103°F and as low as −11°F. A single day has delivered over 7 inches of rain or close to 22 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 Reading (NOAA GHCN station USC00196783), about 12 km from the city centre.

How we build these numbers →