The Clarkstown 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.
Mostly cloudy
Mostly sunny; warmer
Partly cloudy
Sunny
Sunny
Mostly sunny
Mostly sunny
17° on Nov. 15, 1996, the coldest reading for this week of the year since 1946. Next is 18° in 1967.
Clarkstown’s center stands about 150 ft above sea level. Within three miles the land runs from 70 ft to 560 ft, a difference of 490 ft: hilly country. The highest named summit within 15 miles is Blackcap Mountain, about 1,400 ft, 15 miles north-northwest.
The section below crosses 10 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 18×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Basalt. Age: Early Jurassic, 175 to 202 million years old. About 7 mi of the line.
Sandstone. Age: Late Triassic, 202 to 237 million years old. About 5 mi of the line.
Granite, gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 4 mi of the line.
Sandstone, siltstone, mudstone. Age: Late Triassic, 202 to 237 million years old. About 2 mi of the line.
Mudstone, sandstone, arkose. Age: Late Triassic, 202 to 237 million years old. About 1 mi of the line.
Biotite-gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. 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. 4 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 Clarkstown reaches New York Harbor and the Atlantic Ocean by way of the Hackensack: about 40 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Clarkstown; river miles along the main stem, rounded.
Clarkstown 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 Clarkstown 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, 14 miles east-southeast, 220 ft higher. NOAA, through RCC-ACIS.
