How extreme does Mount Pleasant's weather get?

The hottest, coldest, wettest and snowiest days Mount Pleasant 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 Sullivans Is station 4 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 Mount Pleasant has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

103°F Aug 2, 1999

That is about 13°F hotter than a normal August afternoon in Mount Pleasant (typical high near 90°F).

The three most extreme on record

1 103°F Aug 2, 1999

2 103°F Jun 21, 2011

3 102°F Jun 2, 1985

❄️ Coldest night

9°F Jan 21, 1985

About 28°F colder than a normal January night in Mount Pleasant (typical low near 37°F).

The three most extreme on record

1 9°F Jan 21, 1985

2 11°F Dec 20, 2000

3 12°F Feb 12, 1973

🌧️ Most rain in one day

9.83 in Oct 11, 1990

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

The three most extreme on record

1 9.83 in Oct 11, 1990

2 7.50 in Oct 3, 1994

3 7.25 in Oct 25, 2008

⛄ Most snow in one day

4.0 in Dec 27, 1980

The three most extreme on record

1 4.0 in Dec 27, 1980

2 0.5 in Jan 31, 1977

3 0.4 in Jan 11, 2011

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

Mount Pleasant's record heat sits well above even a hot day for the season — August's 103°F is about 13°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, Mount Pleasant's warmest days reach the low 90s°F and its coldest nights drop to the mid-30s°F. But across the record it has gone as high as 103°F and as low as 9°F. A single day has delivered over 10 inches of rain or close to 4 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 Sullivans IS (NOAA GHCN station USC00388405), about 4 km from the city centre.

How we build these numbers →

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