The Pen Argyl 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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75° on Nov. 16, 1993, the hottest reading for this week of the year since 1893. Next is 74° in 1902.
Pen Argyl’s center stands about 810 ft above sea level. Within three miles the land runs from 490 ft to 1,680 ft, a difference of 1,190 ft: steep hill country. The highest named summit within 15 miles is Camelback Mountain, about 2,120 ft, 13 miles north-northwest.
Under the town center the state geologic map shows Martinsburg Formation (shale, slate), from the Ordovician, 445 to 487 million years old.
The section below crosses 17 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 13×. 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, slate. Age: Ordovician, 445 to 487 million years old. About 5 mi of the line.
Shale. Age: Ordovician, 445 to 487 million years old. About 3 mi of the line.
Limestone. Age: Early Devonian to Middle Devonian, 384 to 422 million years old. About 2 mi of the line.
Sandstone, siltstone, mudstone. Age: Late Devonian, 359 to 384 million years old. About 2 mi of the line.
Sandstone, conglomerate. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Shale, siltstone. Age: Early Devonian to Middle Devonian, 384 to 422 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. 11 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 Pen Argyl reaches Delaware Bay and the Atlantic Ocean by way of Waltz Creek, Martins Creek and the Delaware: about 170 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Pen Argyl; river miles along the main stem, rounded.
Pen Argyl has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 18° in January. A normal year brings about 23 inches of snow; with the rain, that comes to about 48 inches of water.
On November 14 Pen Argyl normally reaches 53° and falls to 30°. The record high is 72°, in 1964; the record low 11°, in 1905. The most rain on this date, 0.90 in, fell in 1940.
Normals 1991–2020 and records since 1893 from the Belvidere Area threaded record (Belvidere Bridge, 9 miles east-southeast, 550 ft lower). NOAA, through RCC-ACIS.
