The West Amwell 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.
Partly cloudy
Mostly sunny; warmer
Partly cloudy
Mostly sunny
Sunny
Mostly sunny
Mostly sunny
79° on Nov. 15, 1993, the hottest reading for this week of the year since 1865. Next is 77° in 1973.
West Amwell’s center stands about 450 ft above sea level. Within three miles the land runs from 120 ft to 500 ft, a difference of 380 ft: rolling country. The highest named summit within 15 miles is Round Mountain, about 680 ft, 13 miles north.
Under the town center the state geologic map shows Diabase (plutonic), from the Jurassic, 145 to 202 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 33×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Siltstone. Age: Late Triassic to Early Jurassic, 175 to 237 million years old. About 8 mi of the line.
Siltstone-mudstone, sandstone-mudstone. Age: Late Triassic, 202 to 237 million years old. About 7 mi of the line.
Arkose. Age: Late Triassic, 202 to 237 million years old. About 4 mi of the line.
Plutonic. Age: Jurassic, 145 to 202 million years old. About 2 mi of the line.
Siltstone, shale. Age: Early Jurassic to Late Jurassic, 145 to 202 million years old. About 2 mi of the line.
Sand, clay. Age: Pleistocene, less than 2.6 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. 2 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 West Amwell reaches Delaware Bay and the Atlantic Ocean by way of Alexauken Creek and the Delaware: about 120 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of West Amwell; river miles along the main stem, rounded.
West Amwell has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 24° in January. A normal year brings about 27 inches of snow; with the rain, that comes to about 46 inches of water.
On November 14 West Amwell normally reaches 55° and falls to 37°. The record high is 72°, in 1993; the record low 16°, in 1986. The most rain on this date, 1.89 in, fell in 1972.
Normals 1991–2020 and records since 1865 from the Trenton Area threaded record (Trenton-Mercer Airport, 8 miles south-southeast, 260 ft lower). NOAA, through RCC-ACIS.
