The Dallastown 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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16° on Nov. 16, 1996, the coldest reading for this week of the year since 1988. Next is 17° in 2017.
Dallastown’s center stands about 880 ft above sea level. Within three miles the land runs from 520 ft to 950 ft, a difference of 430 ft: hilly country. The highest named summit within 15 miles is Huntrick Hill, about 1,070 ft, 10 miles southwest.
Under the town center the state geologic map shows Marburg Schist (phyllite, mica-schist), from the Paleozoic, 252 to 542 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 24×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Schist, phyllite. Age: Paleozoic, 252 to 542 million years old. About 10 mi of the line.
Quartzite, schist. Age: Cambrian, 487 to 542 million years old. About 5 mi of the line.
Phyllite, mica-schist. Age: Paleozoic, 252 to 542 million years old. About 4 mi of the line.
Quartzite. Age: Cambrian, 487 to 542 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.
Dolostone. 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.
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 Dallastown reaches Chesapeake Bay and the Atlantic Ocean by way of Inners Creek, East Branch Codorus Creek, South Branch Codorus Creek, Codorus Creek and the Susquehanna: about 80 river miles.
Lake on the way: Lake Aldred.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dallastown; river miles along the main stem, rounded.
Dallastown has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 24° in January. A normal year brings about 34 inches of snow; with the rain, that comes to about 48 inches of water.
On November 14 Dallastown normally reaches 54° and falls to 36°. The record high is 73°, in 1993; the record low 22°, in 2019. The most rain on this date, 1.59 in, fell in 1995.
Normals 1991–2020 and records since 1988 at Millers 4 NE, 15 miles southwest. NOAA, through RCC-ACIS.
