The Prompton 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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71° on Nov. 12, 2020, the hottest reading for this week of the year since 1924. Next is 69° in 1956.
Prompton’s center stands about 1,120 ft above sea level. Within three miles the land runs from 1,060 ft to 1,530 ft, a difference of 470 ft: hilly country. The highest named summit within 15 miles is South Knob, about 2,600 ft, 15 miles northwest.
Under the town center the state geologic map shows Long Run and Walcksville Members of Catskill Formation, undivided (sandstone, siltstone, mudstone), from the Late Devonian, 359 to 384 million years old.
The section below crosses 4 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.
Sandstone, siltstone, mudstone. Age: Late Devonian, 359 to 384 million years old. About 12 mi of the line.
Sandstone, siltstone, shale. Age: Late Devonian, 359 to 384 million years old. About 10 mi of the line.
Sandstone. Age: Carboniferous, 299 to 324 million years old. About 2 mi of the line.
Conglomerate-sandstone, sandstone. Age: Late Devonian, 359 to 384 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 Prompton reaches Delaware Bay and the Atlantic Ocean by way of the West Branch Lackawaxen, the Lackawaxen and the Delaware: about 280 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Prompton; river miles along the main stem, rounded.
Prompton has a warm-summer humid continental climate. Summer afternoons average 77° in July; winter nights fall to about 12° in January. A normal year brings about 69 inches of snow; with the rain, that comes to about 51 inches of water.
On November 14 Prompton normally reaches 45° and falls to 27°. The record high is 64°, in 1964; the record low 5°, in 1986. The most rain on this date, 1.30 in, fell in 1972.
Normals 1991–2020 and records since 1924 at Pleasant Mount 1 W, 12 miles north-northwest, 680 ft higher. NOAA, through RCC-ACIS.
