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Weather extremes

How extreme does Clayton's weather get?

The hottest, coldest, wettest and snowiest days Clayton 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 Watertown station 34 km away. Updated through April 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 Clayton has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
97°F Aug 4, 1988

That is about 18°F hotter than a normal August afternoon in Clayton (typical high near 79°F).

The three most extreme on record

1 97°F Aug 4, 1988
2 97°F Aug 15, 2002
3 96°F Aug 10, 2001
❄️ Coldest night
-34°F Jan 4, 1981

About 45°F colder than a normal January night in Clayton (typical low near 11°F).

The three most extreme on record

1 -34°F Jan 4, 1981
2 -33°F Jan 5, 1981
3 -33°F Jan 17, 1994
🌧️ Most rain in one day
4.65 in Sep 26, 1975

More rain in a single day than Clayton usually gets in the whole month of September (typical September total about 3.9 in).

The three most extreme on record

1 4.65 in Sep 26, 1975
2 3.94 in Oct 30, 2017
3 3.94 in Jul 18, 2021
Most snow in one day
27.0 in Nov 19, 2022

Close to a whole typical November's snow in one day (Clayton averages about 9 in across the month).

The three most extreme on record

1 27.0 in Nov 19, 2022recent
2 22.0 in Dec 11, 1995
3 21.0 in Dec 1, 1976

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.

-50°-30°-10°10°30°50°70°90°110° all-time high 97°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Clayton's record heat sits well above even a hot day for the season — August's 97°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, Clayton's warmest days reach the low 80s°F and its coldest nights drop to the low 10s°F. But across the record it has gone as high as 97°F and as low as −34°F. A single day has delivered over 5 inches of rain or close to 27 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 — 1991–2020 normals computed from 28 years of daily observations at Lyndhurst Shawmere, a weather station, about 31 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →