The Rohrersville 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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81° on Nov. 15, 1973, the hottest reading for this week of the year since 1891. Next is 80° in 1931.
Rohrersville’s center stands about 630 ft above sea level. Within three miles the land runs from 430 ft to 1,570 ft, a difference of 1,140 ft: steep hill country. The highest named summit within 15 miles is Black Rock, about 1,870 ft, 10 miles north-northeast.
Under the town center the state geologic map shows Catoctin Metabasalt, from the Proterozoic to Mesoproterozoic, 1 to 2.5 billion years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 12×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Quartzite. Age: Proterozoic to Cambrian, 487 to 2,500 million years old. About 10 mi of the line.
Shale, phyllite. Age: Cambrian, 487 to 542 million years old. About 6 mi of the line.
Quartzite, conglomerate, sandstone. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Dolostone. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Metabasalt. Age: Proterozoic to Mesoproterozoic, 1 to 2.5 billion years old. About 2 mi of the line.
Metabasalt. Age: Neoproterozoic to Cambrian, 487 to 1,000 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. 2 smaller units 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 Rohrersville reaches Chesapeake Bay and the Atlantic Ocean by way of Little Antietam Creek, Antietam Creek and the Potomac: about 200 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Rohrersville; river miles along the main stem, rounded.
Rohrersville has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 23° in January. About 39 inches of rain fall in a normal year.
On November 14 Rohrersville normally reaches 56° and falls to 35°. The record high is 77°, in 1989; the record low 13°, in 1986. The most rain on this date, 1.41 in, fell in 1972.
Normals 1991–2020 and records since 1891 from the Martinsburg Area threaded record (Martinsburg Eastern West Virginia Regional Airport, 17 miles west). NOAA, through RCC-ACIS.
