The Edgemont 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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1° on Nov. 16, 1908, the coldest reading for this week of the year since 1899. Next is 9° in 1933.
Edgemont’s center stands about 840 ft above sea level. Within three miles the land runs from 610 ft to 2,000 ft, a difference of 1,390 ft: steep hill country. The highest named summit within 15 miles is Quirauk Mountain, about 2,150 ft, 2 miles northeast.
Under the town center the state geologic map shows Tomstown Dolomite (dolostone), from the Cambrian, 487 to 542 million years old.
The section below crosses 9 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.
Limestone, shale. Age: Cambrian, 487 to 542 million years old. About 5 mi of the line.
Age: Precambrian. About 4 mi of the line.
Dolostone. Age: Cambrian, 487 to 542 million years old. About 4 mi of the line.
Age: Precambrian. About 3 mi of the line.
Limestone. Age: Cambrian to Early Ordovician, 471 to 497 million years old. About 3 mi of the line.
Quartzite. Age: Proterozoic to Cambrian, 487 to 2,500 million years old. About 3 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 3 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 Edgemont reaches Chesapeake Bay and the Atlantic Ocean by way of Little Antietam Creek, Antietam Creek and the Potomac: about 230 river miles.
180 miles of the trip are on the Potomac.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Edgemont; river miles along the main stem, rounded.
Edgemont has a humid subtropical climate. Summer afternoons average 87° in July; winter nights fall to about 25° in January. About 36 inches of rain fall in a normal year.
On November 14 Edgemont normally reaches 55° and falls to 38°. The record high is 75°, in 1989; the record low 10°, in 1920. The most rain on this date, 1.91 in, fell in 1995.
Normals 1991–2020 and records since 1899 from the Hagerstown Area threaded record (Hagerstown Regional Airport, 10 miles west-northwest, 150 ft lower). NOAA, through RCC-ACIS.
