The Fort Mill 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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18° on Nov. 15, 1969, the coldest reading for this week of the year since 1899. Next is 20° in 1933.
Fort Mill’s center stands about 650 ft above sea level. Within three miles the land runs from 500 ft to 710 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Nanny Mountain, about 1,000 ft, 10 miles west-northwest.
Under the town center the state geologic map shows Metamorphosed quartz diorite to diorite (metadiorite), from the Neoproterozoic to Cambrian, 487 to 1,000 million years old.
The section below crosses 8 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.
Metadiorite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 7 mi of the line.
Metagranite, metadiorite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 6 mi of the line.
Metavolcanic, gneiss. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 4 mi of the line.
Metadiorite. Age: Neoproterozoic to Paleozoic, 252 to 1,000 million years old. About 3 mi of the line.
Phyllonite, schist. Age: Paleozoic, 252 to 542 million years old. About 2 mi of the line.
Metagranite. Age: Cambrian to Ordovician, 445 to 542 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 smaller units along the line are not listed.
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 Fort Mill reaches the Atlantic Ocean by way of the Catawba, the Wateree, the Congaree, the Santee and the South Santee: about 270 river miles.
Lake on the way: Lib Pines Lake.
90 miles of the trip are on the Wateree.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Fort Mill; river miles along the main stem, rounded.
Fort Mill has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 32° in January. About 43 inches of rain fall in a normal year.
On November 14 Fort Mill normally reaches 64° and falls to 41°. The record high is 81°, in 1931; the record low 21°, in 2013. The most rain on this date, 1.33 in, fell in 1940.
Normals 1991–2020 and records since 1899 at Winthrop University, 7 miles southwest. NOAA, through RCC-ACIS.
