The Harleyville 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
Mostly sunny; warmer
Partly cloudy
Mostly sunny
Mostly sunny
Mostly sunny
Partly cloudy
21° on Nov. 16, 1934, the coldest reading for this week of the year since 1898. Next is 23° in 1901.
Harleyville’s center stands about 90 ft above sea level. Within three miles the land runs from 0 ft to 140 ft, a difference of 140 ft: gently rolling country.
Under the town center the state geologic map shows Bear Bluff Formation (sand, limestone), from the Tertiary, 2.6 to 66 million years old.
The section below crosses 4 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.
Sand, limestone. Age: Tertiary, 2.6 to 66 million years old. About 15 mi of the line.
Sand, gravel. Age: Quaternary, less than 2.6 million years old. About 6 mi of the line.
Limestone, sand. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Sand, clay. Age: Pliocene, 2.6 to 5.3 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 Harleyville reaches the Atlantic Ocean by way of Tom and Kate Branch, Indian Field Swamp, Polk Swamp, the Edisto and the North Edisto: about 80 river miles.
55 miles of the trip are on the Edisto.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Harleyville; river miles along the main stem, rounded.
Harleyville has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 34° in January. About 53 inches of rain fall in a normal year.
On November 14 Harleyville normally reaches 68° and falls to 42°. The record high is 87°, in 1902; the record low 24°, in 1977. The most rain on this date, 1.58 in, fell in 2008.
Normals 1991–2020 and records since 1898 at Summerville 4 W, 17 miles southeast. NOAA, through RCC-ACIS.
