The Troy 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
Mostly sunny
Sunny
Sunny
Mostly sunny
Mostly sunny
4.34 inches of rain fell in two days, the most for this week of the year since records began in 1899. The next wettest, 3.01 inches, fell in 1940.
Troy’s center stands about 540 ft above sea level. Within three miles the land runs from 400 ft to 590 ft, a difference of 190 ft: gently rolling country. The highest named summit within 15 miles is Parsons Mountain, about 840 ft, 7 miles north-northwest.
Under the town center the state geologic map shows Gabbro - McCormick pluton, from the Silurian to Devonian, 359 to 445 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 57×. 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 Paleozoic, 252 to 1,000 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.
Metagranite. Age: Neoproterozoic to Devonian, 359 to 1,000 million years old. About 4 mi of the line.
Metadacite. Age: Neoproterozoic, 542 to 1,000 million years old. About 3 mi of the line.
Metavolcanic. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 3 mi of the line.
Gabbro. Age: Silurian to Devonian, 359 to 445 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. 1 smaller unit 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 Troy reaches the Atlantic Ocean by way of Puckett Branch, Rocky Branch, Long Cane Creek and the Savannah: about 260 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Troy; river miles along the main stem, rounded.
Troy has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 32° in January. About 47 inches of rain fall in a normal year.
On November 14 Troy normally reaches 65° and falls to 40°. The record high is 83°, in 1924; the record low 21°, in 1984. The most rain on this date, 1.66 in, fell in 1972.
Normals 1991–2020 and records since 1899 at Calhoun Falls, 18 miles west-northwest. NOAA, through RCC-ACIS.
