The North Heidelberg 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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78° on Nov. 15, 1993, the hottest reading for this week of the year since 1858. Next is 74° in 1902.
North Heidelberg’s center stands about 450 ft above sea level. Within three miles the land runs from 300 ft to 570 ft, a difference of 270 ft: rolling country. The highest named summit within 15 miles is Eagle Peak, about 1,320 ft, 5 miles southwest.
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.
Shale. Age: Ordovician, 445 to 487 million years old. About 8 mi of the line.
Shale. Age: Ordovician, 445 to 487 million years old. About 7 mi of the line.
Dolostone. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Sandstone. Age: Triassic, 202 to 252 million years old. About 1 mi of the line.
Sandstone, conglomerate. Age: Silurian, 422 to 445 million years old. About 1 mi of the line.
Limestone. Age: Ordovician, 445 to 487 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. 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 North Heidelberg reaches Delaware Bay and the Atlantic Ocean by way of Tulpehocken Creek, the Schuylkill and the Delaware: about 150 river miles.
75 miles of the trip are on the Schuylkill.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of North Heidelberg; river miles along the main stem, rounded.
North Heidelberg has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 23° in January. About 45 inches of rain fall in a normal year.
On November 14 North Heidelberg normally reaches 54° and falls to 36°. The record high is 74°, in 1955; the record low 16°, in 1986. The most rain on this date, 1.37 in, fell in 1995.
Normals 1991–2020 and records since 1858 from the Reading Area threaded record (Reading 4 SW, 9 miles southeast, 130 ft lower). NOAA, through RCC-ACIS.
