The Locust Valley 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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80° on Nov. 15, 1993, the hottest reading for this week of the year since 1939. Next is 74° in 1949.
Locust Valley’s center stands about 130 ft above sea level. Within three miles the land runs from 0 ft to 250 ft, a difference of 250 ft: rolling country. Open water lies within three miles. The highest named summit within 15 miles is High Hill, about 420 ft, 10 miles east-southeast.
Under the town center the state geologic map shows Monmouth Group, Matawan Group and Magothy Formation (clay, sand, gravel), from the Late Cretaceous, 66 to 100 million years old.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 57×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Clay, sand, gravel. Age: Late Cretaceous, 66 to 100 million years old. About 15 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 Locust Valley reaches Long Island Sound and the Atlantic Ocean by way of Beaver Brook: about 1 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Locust Valley; river miles along the main stem, rounded.
Locust Valley has a humid subtropical climate. Summer afternoons average 86° in July; winter nights fall to about 29° in January. A normal year brings about 30 inches of snow; with the rain, that comes to about 45 inches of water.
On November 14 Locust Valley normally reaches 56° and falls to 44°. The record high is 72°, in 1993; the record low 24°, in 1986. The most rain on this date, 2.05 in, fell in 1972.
Normals 1991–2020 and records since 1939 from the New York-LGA Area threaded record (Laguardia Airport, 17 miles west-southwest, 120 ft lower). NOAA, through RCC-ACIS.
