The Helmetta 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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79° on Nov. 16, 1993, the hottest reading for this week of the year since 1893. Next is 76° in 2020.
Helmetta’s center stands about 60 ft above sea level. Within three miles the land runs from 30 ft to 180 ft, a difference of 150 ft: gently rolling country. The highest named summit within 15 miles is Beacon Hill, about 430 ft, 10 miles east.
Under the town center the state geologic map shows Magothy Formation (sand), from the Late Cretaceous, 84 to 87 million years old.
The section below crosses 12 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 59×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand. Age: Late Cretaceous, 84 to 87 million years old. About 9 mi of the line.
Siltstone. Age: Late Triassic to Early Jurassic, 175 to 237 million years old. About 3 mi of the line.
Silt, sand. Age: Late Cretaceous, 94 to 100 million years old. About 2 mi of the line.
Clay, silt. Age: Late Cretaceous, 72 to 84 million years old. About 2 mi of the line.
Sand, clay. Age: Late Cretaceous, 72 to 84 million years old. About 2 mi of the line.
Sand. Age: Late Cretaceous, 72 to 84 million 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. 6 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 Helmetta reaches New York Harbor and the Atlantic Ocean by way of Cedar Brook, Manalapan Brook, the South River and the Raritan: about 19 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Helmetta; river miles along the main stem, rounded.
Helmetta has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 23° in January. A normal year brings about 29 inches of snow; with the rain, that comes to about 50 inches of water.
On November 14 Helmetta normally reaches 56° and falls to 36°. The record high is 72°, in 1955; the record low 15°, in 1986. The most rain on this date, 0.81 in, fell in 1940.
Normals 1991–2020 and records since 1893 from the New Brunswick Area threaded record (New Brunswick 3 SE, 7 miles north). NOAA, through RCC-ACIS.
