The Unionville 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, 1928, the hottest reading for this week of the year since 1880. Next is 75° in 1993.
Unionville’s center stands about 540 ft above sea level. Within three miles the land runs from 380 ft to 920 ft, a difference of 540 ft: hilly country. The highest named summit within 15 miles is Kittatinny Mountain, about 1,780 ft, 5 miles west-northwest.
Under the town center the state geologic map shows Austin Glen Formation (graywacke, shale), from the Middle Ordovician, 459 to 471 million years old.
The section below crosses 15 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 15×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone, dolostone. Age: Cambrian to Early Ordovician, 471 to 542 million years old. About 4 mi of the line.
Shale, sandstone. Age: Late Ordovician, 445 to 459 million years old. About 3 mi of the line.
Graywacke, shale. Age: Middle Ordovician, 459 to 471 million years old. About 3 mi of the line.
Marble. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.
Shale, siltstone. Age: Early Devonian to Middle Devonian, 384 to 422 million years old. About 2 mi of the line.
Dolostone. Age: Early Cambrian, 521 to 542 million years old. About 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. 9 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 Unionville reaches New York Harbor and the Atlantic Ocean by way of the Hudson: about 170 river miles.
90 miles of the trip are on the Hudson.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Unionville; river miles along the main stem, rounded.
Unionville has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 16° in January. A normal year brings about 43 inches of snow; with the rain, that comes to about 47 inches of water.
On November 14 Unionville normally reaches 50° and falls to 30°. The record high is 71°, in 1989; the record low 12°, in 1905. The most rain on this date, 1.40 in, fell in 1972.
Normals 1991–2020 and records since 1880 at Port Jervis, 9 miles northwest. NOAA, through RCC-ACIS.
