The Rock Hill 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.
Partly cloudy
Showers likely; warmer
Showers likely
Mostly sunny
Partly cloudy
Mostly sunny
Mostly sunny
21° on Nov. 13, 2019, the coldest reading for this week of the year since 1948. Next is 25° in 1950.
Rock Hill’s center stands about 160 ft above sea level. Within three miles the land runs from 80 ft to 260 ft, a difference of 180 ft: gently rolling country.
Under the town center the state geologic map shows Alluvium (clay), from the Holocene, less than 12,000 years old.
The section below crosses 5 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, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 10 mi of the line.
Clay. Age: Holocene, less than 12,000 years old. About 7 mi of the line.
Silt, clay. Age: Holocene, less than 12,000 years old. About 6 mi of the line.
Clay, silt. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
Clay, siltstone. Age: Miocene, 5.3 to 23 million years old. About 0.6 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 Rock Hill reaches the Gulf of America by way of the Red River, the Atchafalaya and the Lower Atchafalaya: about 250 river miles.
100 miles of the trip are on the Atchafalaya.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Rock Hill; river miles along the main stem, rounded.
Rock Hill has a humid subtropical climate. Summer afternoons average 94° in August; winter nights fall to about 39° in January. About 55 inches of rain fall in a normal year.
On November 14 Rock Hill normally reaches 70° and falls to 46°. The record high is 86°, in 1955; the record low 26°, in 2013. The most rain on this date, 3.91 in, fell in 1964.
Normals 1991–2020 and records since 1948 at Alexandria International Airport, 8 miles south. NOAA, through RCC-ACIS.
