The East Greenville 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. 11, 2020, the hottest reading for this week of the year since 1948. Next is 72° in 2005.
East Greenville’s center stands about 370 ft above sea level. Within three miles the land runs from 290 ft to 690 ft, a difference of 400 ft: hilly country. The highest named summit within 15 miles is Topton Mountain, about 1,270 ft, 11 miles west-northwest.
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 21×. 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 11 mi of the line.
Gneiss. Age: Precambrian. About 8 mi of the line.
Basalt. Age: Jurassic, 145 to 202 million years old. About 4 mi of the line.
Argillite. Age: Triassic, 202 to 252 million years old. About 0.7 mi of the line.
Quartzite, sandstone. Age: Cambrian, 487 to 542 million years old. About 0.6 mi of the line.
Hornblende-gneiss. Age: Precambrian. About 0.4 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 East Greenville reaches Delaware Bay and the Atlantic Ocean by way of Perkiomen Creek, the Schuylkill and the Delaware: about 120 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 East Greenville; river miles along the main stem, rounded.
East Greenville has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 19° in January. A normal year brings about 22 inches of snow; with the rain, that comes to about 52 inches of water.
On November 14 East Greenville normally reaches 54° and falls to 32°. The record high is 66°, in 2010; the record low 18°, in 1996. The most rain on this date, 0.55 in, fell in 2008.
Normals 1991–2020 and records since 1948 at Sellersville, 11 miles east-southeast. NOAA, through RCC-ACIS.
