The Rockledge 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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81° on Nov. 15, 1993, the hottest reading for this week of the year since 1945. Next is 77° in 2006.
Rockledge’s center stands about 240 ft above sea level. Within three miles the land runs from 90 ft to 350 ft, a difference of 260 ft: rolling country.
Under the town center the state geologic map shows Wissahickon Formation (mica-schist), from the Paleozoic, 252 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 45×. 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 10 mi of the line.
Sand, clay. Age: Pleistocene, less than 2.6 million years old. About 4 mi of the line.
Sand. Age: Miocene, 5.3 to 23 million years old. About 3 mi of the line.
Limestone. Age: Cambrian to Ordovician, 445 to 542 million years old. About 2 mi of the line.
Sand, gravel. Age: Miocene, 5.3 to 23 million years old. About 1 mi of the line.
Quartzite, schist. Age: Cambrian, 487 to 542 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. 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 Rockledge reaches Delaware Bay and the Atlantic Ocean by way of Pennypack Creek and the Delaware: about 85 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Rockledge; river miles along the main stem, rounded.
Rockledge has a humid subtropical climate. Summer afternoons average 88° in July; winter nights fall to about 27° in January. About 45 inches of rain fall in a normal year.
On November 14 Rockledge normally reaches 57° and falls to 39°. The record high is 74°, in 1993; the record low 20°, in 1986. The most rain on this date, 2.30 in, fell in 1972.
Normals 1991–2020 and records since 1945 at Northeast Philadelphia Airport, 4 miles east, 130 ft lower. NOAA, through RCC-ACIS.
