The Kemps Mill 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.
Kemps Mill’s center stands about 400 ft above sea level. Within three miles the land runs from 330 ft to 600 ft, a difference of 270 ft: rolling country. The highest named summit within 15 miles is Cross Mountain, about 2,070 ft, 12 miles northwest.
Under the town center the state geologic map shows Rockdale Run Formation (dolostone, limestone), from the Ordovician, 445 to 487 million years old.
The section below crosses 11 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 14×. 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. Age: Cambrian to Early Ordovician, 471 to 497 million years old. About 6 mi of the line.
Dolostone, limestone. Age: Ordovician, 445 to 487 million years old. About 5 mi of the line.
Graywacke, shale. Age: Ordovician, 445 to 487 million years old. About 3 mi of the line.
Shale. Age: Ordovician, 445 to 487 million years old. About 2 mi of the line.
Dolostone. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Limestone, shale. Age: Cambrian, 487 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. 5 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 Kemps Mill reaches Chesapeake Bay and the Atlantic Ocean by way of Conococheague Creek and the Potomac: about 220 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Kemps Mill; river miles along the main stem, rounded.
Kemps Mill 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 Kemps Mill 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, 7 miles northeast, 290 ft higher). NOAA, through RCC-ACIS.
