The Williamston 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.
Sunny
Sunny; warmer
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Mostly sunny
Mostly sunny
20° on Nov. 13, 2013, the coldest reading for this week of the year since 1948. Next is 21° in 1997.
Williamston’s center stands about 800 ft above sea level. Within three miles the land runs from 690 ft to 930 ft, a difference of 240 ft: rolling country.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 50×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mica-schist. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 8 mi of the line.
Biotite-gneiss, mica-schist. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 6 mi of the line.
Gneiss. Age: Ordovician, 445 to 487 million years old. About 6 mi of the line.
Gneiss. Age: Ordovician to Silurian, 422 to 487 million years old. About 2 mi of the line.
Biotite-gneiss. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 2 mi of the line.
Gneiss. Age: Paleozoic, 252 to 542 million years old. About 0.9 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 Williamston reaches the Atlantic Ocean by way of Big Creek, the Saluda, the Congaree, the Santee and the South Santee: about 300 river miles.
Lakes on the way: Lib Pines Lake and Lake Murray.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Williamston; river miles along the main stem, rounded.
Williamston has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 33° in January. About 46 inches of rain fall in a normal year.
On November 14 Williamston normally reaches 64° and falls to 41°. The record high is 79°, in 2007; the record low 22°, in 2013. The most rain on this date, 1.44 in, fell in 1961.
Normals 1991–2020 and records since 1948 at Anderson Regional Airport, 15 miles west-southwest. NOAA, through RCC-ACIS.
