The Skippack 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 1893. Next is 77° in 1973.
Skippack’s center stands about 210 ft above sea level. Within three miles the land runs from 120 ft to 350 ft, a difference of 230 ft: rolling country. The highest named summit within 15 miles is Rock Hill, about 860 ft, 14 miles north-northeast.
Under the town center the state geologic map shows Brunswick Formation (mudstone), from the Triassic, 202 to 252 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 34×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mudstone. Age: Triassic, 202 to 252 million years old. About 16 mi of the line.
Argillite. Age: Triassic, 202 to 252 million years old. About 4 mi of the line.
Arkose. Age: Triassic, 202 to 252 million years old. About 3 mi of the line.
Gneiss. Age: Precambrian. About 0.5 mi of the line.
Gneiss. Age: Precambrian. About 0.4 mi of the line.
Muscovite-gneiss. Age: Precambrian. About 0.2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
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 Skippack reaches Delaware Bay and the Atlantic Ocean by way of Perkiomen Creek, the Schuylkill and the Delaware: about 100 river miles.
60 miles of the trip are on the Delaware.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Skippack; river miles along the main stem, rounded.
Skippack has a hot-summer humid continental climate. Summer afternoons average 88° in July; winter nights fall to about 23° in January. About 45 inches of rain fall in a normal year.
On November 14 Skippack normally reaches 56° and falls to 35°. The record high is 75°, in 1955; the record low 19°, in 1950. The most rain on this date, 2.56 in, fell in 1972.
Normals 1991–2020 and records since 1893 at Phoenixville 1 E, 8 miles south-southwest. NOAA, through RCC-ACIS.
