The Lyman 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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3.05 inches of rain fell in two days, the most for this week of the year since records began in 1884. The next wettest, 3.02 inches, fell in 1889.
Lyman’s center stands about 860 ft above sea level. Within three miles the land runs from 740 ft to 950 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Pax Mountain, about 1,340 ft, 14 miles northwest.
Under the town center the state geologic map shows Biotite gneiss and muscovite-biotite gneiss (biotite-gneiss), from the Neoproterozoic to Cambrian, 487 to 1,000 million 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 37×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Biotite-gneiss. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 8 mi of the line.
Gneiss. Age: Ordovician, 445 to 487 million years old. About 5 mi of the line.
Mica-schist. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 5 mi of the line.
Biotite-gneiss. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 4 mi of the line.
Gneiss. Age: Paleozoic, 252 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.
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 Lyman reaches the Atlantic Ocean by way of the North Tyger, the Tyger, the Broad, the Congaree, the Santee and the South Santee: about 300 river miles.
Lake on the way: Lib Pines Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lyman; river miles along the main stem, rounded.
Lyman has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 32° in January. About 50 inches of rain fall in a normal year, with about 4 inches of snow.
On November 14 Lyman normally reaches 63° and falls to 41°. The record high is 79°, in 2007; the record low 20°, in 1906. The most rain on this date, 1.31 in, fell in 2024.
Normals 1991–2020 and records since 1884 from the Greenville-Spartanburg Area threaded record (Grnvl Spart International Airport, 6 miles west-southwest, 110 ft higher). NOAA, through RCC-ACIS.
