How extreme does Charleston's weather get?

The hottest, coldest, wettest and snowiest days Charleston 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 Charleston station 2 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 Charleston has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

105°F Jun 28, 2012

That is about 20°F hotter than a normal June afternoon in Charleston (typical high near 86°F).

The three most extreme on record

1 105°F Jun 28, 2012

2 104°F Jul 5, 2012

3 104°F Jul 6, 2012

❄️ Coldest night

-27°F Jan 19, 1994

About 48°F colder than a normal January night in Charleston (typical low near 21°F).

The three most extreme on record

1 -27°F Jan 19, 1994

2 -22°F Jan 20, 1985

3 -20°F Jan 17, 1977

🌧️ Most rain in one day

5.18 in Jul 21, 1973

More rain in a single day than Charleston usually gets in the whole month of July (typical July total about 4.4 in).

The three most extreme on record

1 5.18 in Jul 21, 1973

2 4.95 in Sep 9, 1989

3 4.66 in May 7, 2002

⛄ Most snow in one day

12.0 in Jan 30, 1982

Close to a whole typical January's snow in one day (Charleston averages about 8 in across the month).

The three most extreme on record

1 12.0 in Jan 30, 1982

2 11.2 in Jan 5, 2014

3 11.0 in Jan 3, 1996

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.

normal range of daily temperatureshottest ever recordedcoldest ever recorded

Charleston's record heat sits well above even a hot day for the season — June's 105°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, Charleston's warmest days reach the high 80s°F and its coldest nights drop to the low 20s°F. But across the record it has gone as high as 105°F and as low as −27°F. A single day has delivered over 5 inches of rain or close to 12 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 Charleston (NOAA GHCN station USC00111436), about 2 km from the city centre.

How we build these numbers →

← Charleston city detail