The Mount Pleasant plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
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84° on Nov. 12, 1989, the hottest reading for this week of the year since 1951. Next is 83° in 1964.
Mount Pleasant’s center stands about 30 ft above sea level. Within three miles the land runs from 0 ft to 50 ft, a difference of 50 ft: nearly flat ground. Open water lies within three miles.
Under the town center the state geologic map shows Wando Formation (clay, sand), from the Pleistocene, less than 2.6 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Clay, sand. Age: Pleistocene, less than 2.6 million years old. About 9 mi of the line.
Sand, clay. Age: Quaternary, less than 2.6 million years old. About 4 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in Mount Pleasant reaches Charleston Harbor and the Atlantic Ocean by way of Shem Creek: about 2 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mount Pleasant; river miles along the main stem, rounded.
Mount Pleasant has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 36° in January. About 52 inches of rain fall in a normal year.
On November 14 Mount Pleasant normally reaches 70° and falls to 47°. The record high is 80°, in 2005; the record low 32°, in 2019. The most rain on this date, 0.65 in, fell in 1997.
Normals 1991–2020 and records since 1951 at Sullivans Island, 2 miles south. NOAA, through RCC-ACIS.
