The Claymont 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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79° on Nov. 15, 1993, the hottest reading for this week of the year since 1931. Next is 75° in 1973.
Claymont’s center stands about 100 ft above sea level. Within three miles the land runs from 0 ft to 390 ft, a difference of 390 ft: rolling country. Open water lies within three miles. The highest named summit within 15 miles is Hunting Hill, about 510 ft, 11 miles north.
Under the town center the state geologic map shows Arden Granite, from the Paleozoic, 252 to 542 million years old.
The section below crosses 6 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.
Mica-schist. Age: Paleozoic, 252 to 542 million years old. About 7 mi of the line.
Gneiss. Age: Paleozoic, 252 to 542 million years old. About 2 mi of the line.
Age: Paleozoic, 252 to 542 million years old. About 2 mi of the line.
Gneiss. Age: Paleozoic, 252 to 542 million years old. About 2 mi of the line.
Granite. Age: Paleozoic, 252 to 542 million years old. About 1 mi of the line.
Sand. Age: Miocene, 5.3 to 23 million years old. About 0.3 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
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 Claymont reaches Delaware Bay and the Atlantic Ocean by way of the Delaware: about 45 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Claymont; river miles along the main stem, rounded.
Claymont has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 24° in January. A normal year brings about 12 inches of snow; with the rain, that comes to about 50 inches of water.
On November 14 Claymont normally reaches 53° and falls to 37°. The record high is 73°, in 1993; the record low 21°, in 1986. The most rain on this date, 2.17 in, fell in 1972.
Normals 1991–2020 and records since 1931 at Wilmington Porter Res, 5 miles west-southwest, 170 ft higher. NOAA, through RCC-ACIS.
