The Penns Grove 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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80° on Nov. 15, 1993, the hottest reading for this week of the year since 1894. Next is 78° in 1973.
Penns Grove’s center stands about 16 ft above sea level. Within three miles the land runs from 0 ft to 120 ft, a difference of 120 ft: gently rolling country. Open water lies within three miles. The highest named summit within 15 miles is Horseshoe Hill, about 400 ft, 11 miles west-northwest.
Under the town center the state geologic map shows Potomac Formation, unit 3 (sand, clay), from the Late Cretaceous, 94 to 100 million 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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, clay. Age: Late Cretaceous, 94 to 100 million years old. About 5 mi of the line.
Sand. Age: Late Cretaceous, 72 to 84 million years old. About 5 mi of the line.
Sand. Age: Late Cretaceous, 84 to 87 million years old. About 2 mi of the line.
Mica-schist. Age: Paleozoic, 252 to 542 million years old. About 2 mi of the line.
Sand. Age: Miocene, 5.3 to 23 million years old. About 1 mi of the line.
Sand, clay. Age: Pleistocene, less than 2.6 million years old. About 1 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 Penns Grove reaches Delaware Bay and the Atlantic Ocean by way of the Delaware: about 40 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Penns Grove; river miles along the main stem, rounded.
Penns Grove has a humid subtropical climate. Summer afternoons average 87° in July; winter nights fall to about 26° in January. A normal year brings about 20 inches of snow; with the rain, that comes to about 45 inches of water.
On November 14 Penns Grove normally reaches 56° and falls to 38°. The record high is 76°, in 1955; the record low 20°, in 1986. The most rain on this date, 2.42 in, fell in 1972.
Normals 1991–2020 and records since 1894 from the Wilmington Area threaded record (Wilmington Airport, 8 miles west-southwest). NOAA, through RCC-ACIS.
