The Hempstead 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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77° on Nov. 15, 1993, the hottest reading for this week of the year since 1948. Next is 72° in 2001.
Hempstead’s center stands about 60 ft above sea level. Within three miles the land runs from 30 ft to 120 ft, a difference of 90 ft: gently rolling country. The highest named summit within 15 miles is High Hill, about 420 ft, 13 miles northeast.
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 55×. 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 20 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 Hempstead reaches the Atlantic Ocean by way of the Mill: about 4 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hempstead; river miles along the main stem, rounded.
Hempstead has a humid subtropical climate. Summer afternoons average 84° in July; winter nights fall to about 26° in January. A normal year brings about 26 inches of snow; with the rain, that comes to about 43 inches of water.
On November 14 Hempstead normally reaches 54° and falls to 40°. The record high is 68°, in 2005; the record low 24°, in 2019. The most rain on this date, 1.91 in, fell in 1972.
Normals 1991–2020 and records since 1948 from the New York-Kennedy Airport Area threaded record (Jfk International Airport, 9 miles west-southwest). NOAA, through RCC-ACIS.
