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Weather extremes

How extreme does Chester's weather get?

The hottest, coldest, wettest and snowiest days Chester 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 Hawarden station 6 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 Chester has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
99°F Jul 18, 2022

That is about 29°F hotter than a normal July afternoon in Chester (typical high near 70°F).

The three most extreme on record

1 99°F Jul 18, 2022recent
2 97°F Jul 19, 2022
3 93°F Jul 19, 2006
❄️ Coldest night
7°F Dec 25, 2010

About 29°F colder than a normal December night in Chester (typical low near 36°F).

The three most extreme on record

1 7°F Dec 25, 2010
2 9°F Dec 20, 2010
3 10°F Mar 3, 2006
🌧️ Most rain in one day
2.69 in Jul 21, 2010

More rain in a single day than Chester usually gets in the whole month of July (typical July total about 2.2 in).

The three most extreme on record

1 2.69 in Jul 21, 2010
2 2.43 in Sep 6, 2008
3 2.06 in Jun 12, 2019

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 99°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Chester's record heat sits well above even a hot day for the season — July's 99°F is about 29°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, Chester's warmest days reach the low 70s°F and its coldest nights drop to the mid-30s°F. But across the record it has gone as high as 99°F and as low as 7°F. A single day has delivered over 3 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 Hawarden, a weather station, about 6 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →