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Weather extremes

How extreme does Saint Sampson's weather get?

The hottest, coldest, wettest and snowiest days Saint Sampson 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 Guernsey station 8 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 Saint Sampson has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
94°F Aug 9, 2003

That is about 26°F hotter than a normal August afternoon in Saint Sampson (typical high near 68°F).

The three most extreme on record

1 94°F Aug 9, 2003
2 94°F Jul 18, 2022
3 93°F Aug 5, 2003
❄️ Coldest night
18°F Mar 7, 2008

About 24°F colder than a normal March night in Saint Sampson (typical low near 42°F).

The three most extreme on record

1 18°F Mar 7, 2008
2 19°F Feb 7, 1991
3 22°F Feb 8, 1991
🌧️ Most rain in one day
13.23 in Sep 6, 1998

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

The three most extreme on record

1 13.23 in Sep 6, 1998
2 12.13 in Aug 6, 1997
3 11.81 in Oct 17, 2006

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 94°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Saint Sampson's record heat sits well above even a hot day for the season — August's 94°F is about 26°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, Saint Sampson's warmest days reach the high 60s°F and its coldest nights drop to the low 40s°F. But across the record it has gone as high as 94°F and as low as 18°F. A single day has delivered over 13 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 Guernsey: Airport, a weather station, about 8 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →