The Delaware 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 1865. Next is 77° in 1973.
Delaware’s center stands about 300 ft above sea level. Within three miles the land runs from 70 ft to 550 ft, a difference of 480 ft: hilly country. The highest named summit within 15 miles is Haycock Mountain, about 980 ft, 14 miles west-northwest.
Under the town center the state geologic map shows Stockton Formation (arkose), from the Late Triassic, 202 to 237 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 31×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Siltstone-mudstone, sandstone-mudstone. Age: Late Triassic, 202 to 237 million years old. About 8 mi of the line.
Mudstone. Age: Triassic, 202 to 252 million years old. About 4 mi of the line.
Arkose. Age: Late Triassic, 202 to 237 million years old. About 4 mi of the line.
Dolostone, limestone. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Siltstone-mudstone. Age: Late Jurassic, 145 to 164 million years old. About 2 mi of the line.
Conglomerate. Age: Triassic, 202 to 252 million years old. About 0.8 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 Delaware reaches Delaware Bay and the Atlantic Ocean by way of the Delaware: about 120 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Delaware; river miles along the main stem, rounded.
Delaware has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 24° in January. A normal year brings about 27 inches of snow; with the rain, that comes to about 46 inches of water.
On November 14 Delaware normally reaches 55° and falls to 37°. The record high is 72°, in 1993; the record low 16°, in 1986. The most rain on this date, 1.89 in, fell in 1972.
Normals 1991–2020 and records since 1865 from the Trenton Area threaded record (Trenton-Mercer Airport, 13 miles south-southeast, 110 ft lower). NOAA, through RCC-ACIS.
