The Ossining 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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17° on Nov. 15, 1996, the coldest reading for this week of the year since 1946. Next is 18° in 1967.
Ossining’s center stands about 190 ft above sea level. Within three miles the land runs from 0 ft to 600 ft, a difference of 600 ft: hilly country. Open water lies within three miles. The highest named summit within 15 miles is Bradley Mountain, about 1,390 ft, 15 miles west-northwest.
Under the town center the state geologic map shows Inwood Marble, from the Early Cambrian to Early Ordovician, 471 to 542 million years old.
The section below crosses 13 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 16×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gneiss. Age: Precambrian to Mesoproterozoic. About 4 mi of the line.
Granite, gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.
Marble. Age: Early Cambrian to Early Ordovician, 471 to 542 million years old. About 2 mi of the line.
Sandstone. Age: Late Triassic, 202 to 237 million years old. About 2 mi of the line.
Schist, gneiss. Age: Early Ordovician to Middle Ordovician, 459 to 487 million years old. About 2 mi of the line.
Gneiss. Age: Precambrian to Mesoproterozoic. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 7 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 Ossining reaches New York Harbor and the Atlantic Ocean by way of the Hudson: about 35 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ossining; river miles along the main stem, rounded.
Ossining has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 23° in January. About 48 inches of rain fall in a normal year.
On November 14 Ossining normally reaches 53° and falls to 37°. The record high is 71°, in 1993; the record low 20°, in 1986. The most rain on this date, 1.92 in, fell in 1972.
Normals 1991–2020 and records since 1946 at Westchester Co Airport, 11 miles southeast, 180 ft higher. NOAA, through RCC-ACIS.
