The Allendale 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 1969. Next is 76° in 1973.
Allendale’s center stands about 370 ft above sea level. Within three miles the land runs from 150 ft to 550 ft, a difference of 400 ft: rolling country. The highest named summit within 15 miles is Hogencamp Mountain, about 1,340 ft, 14 miles north.
Under the town center the state geologic map shows Passaic Formation Quatzite-clast Conglomerate facies (conglomerate, sandstone), from the Early Jurassic to Late Jurassic, 145 to 202 million years old.
The section below crosses 7 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.
Conglomerate, sandstone. Age: Early Jurassic to Late Jurassic, 145 to 202 million years old. About 10 mi of the line.
Conglomerate-sandstone. Age: Early Jurassic to Late Jurassic, 145 to 202 million years old. About 3 mi of the line.
Granite, gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.
Sandstone, siltstone. Age: Early Jurassic to Late Jurassic, 145 to 202 million years old. About 3 mi of the line.
Conglomerate. Age: Late Triassic, 202 to 237 million years old. About 3 mi of the line.
Amphibolite, hornblende-gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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 Allendale reaches New York Harbor and the Atlantic Ocean by way of Ramsey Brook, Hohokus Brook, the Saddle and the Passaic: about 30 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Allendale; river miles along the main stem, rounded.
Allendale has a humid subtropical climate. Summer afternoons average 87° in July; winter nights fall to about 26° in January. About 46 inches of rain fall in a normal year.
On November 14 Allendale normally reaches 56° and falls to 39°. The record high is 72°, in 1973; the record low 18°, in 1986. The most rain on this date, 0.96 in, fell in 1979.
Normals 1991–2020 and records since 1969 at Teterboro Airport, 13 miles south-southeast, 370 ft lower. NOAA, through RCC-ACIS.
