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Weather extremes

How extreme does Falmouth's weather get?

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

Based on 34 years of daily weather observations (1991–present), from the Culdrose station 15 km away. Updated through August 2025 — 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 Falmouth has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
86°F Aug 14, 2022

That is about 20°F hotter than a normal August afternoon in Falmouth (typical high near 66°F).

The three most extreme on record

1 86°F Aug 14, 2022recent
2 84°F Aug 11, 2022
3 84°F Aug 12, 2022
❄️ Coldest night
18°F Jan 7, 2009

About 22°F colder than a normal January night in Falmouth (typical low near 40°F).

The three most extreme on record

1 18°F Jan 7, 2009
2 21°F Feb 7, 1991
3 21°F Jan 2, 1997
🌧️ Most rain in one day
11.46 in Jun 9, 1993

More rain in a single day than Falmouth usually gets in the whole month of June (typical June total about 2.6 in).

The three most extreme on record

1 11.46 in Jun 9, 1993
2 7.48 in Aug 12, 1992
3 3.90 in Jul 13, 1993

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.

-10°10°30°50°70°90°110° all-time high 86°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Falmouth's record heat sits well above even a hot day for the season — August's 86°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

In a normal year, Falmouth's warmest days reach the mid-60s°F and its coldest nights drop to the high 30s°F. But across the record it has gone as high as 86°F and as low as 18°F. A single day has delivered over 11 inches of rain. 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 30 years of daily observations at Culdrose, a weather station, about 15 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →