The Coeymans 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.
Mostly cloudy
Partly cloudy; warmer
Mostly cloudy
Mostly sunny
Mostly sunny
Mostly sunny
Partly cloudy
73° on Nov. 16, 1993, the hottest reading for this week of the year since 1942. Next is 72° in 2020.
Coeymans’s center stands about 360 ft above sea level. Within three miles the land runs from 150 ft to 1,090 ft, a difference of 940 ft: steep hill country. The highest named summit within 15 miles is Filkin Hill, about 1,820 ft, 13 miles northwest.
Under the town center the state geologic map shows Onondaga Limestone (shale), from the Early Devonian to Middle Devonian, 388 to 410 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 12×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, shale. Age: Middle Devonian, 384 to 394 million years old. About 12 mi of the line.
Shale. Age: Neoproterozoic to Early Cambrian, 521 to 1,000 million years old. About 6 mi of the line.
Shale. Age: Early Devonian to Middle Devonian, 388 to 410 million years old. About 2 mi of the line.
Graywacke, sandstone, siltstone. Age: Late Ordovician, 445 to 459 million years old. About 2 mi of the line.
Limestone, dolostone. Age: Early Devonian, 394 to 422 million years old. About 0.8 mi of the line.
Melange. Age: Middle Ordovician, 459 to 471 million years old. About 0.3 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 Coeymans reaches New York Harbor and the Atlantic Ocean by way of Hannacrois Creek and the Hudson: about 140 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Coeymans; river miles along the main stem, rounded.
Coeymans has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 13° in January. A normal year brings about 46 inches of snow; with the rain, that comes to about 42 inches of water.
On November 14 Coeymans normally reaches 48° and falls to 30°. The record high is 66°, in 1964; the record low 8°, in 1971. The most rain on this date, 1.17 in, fell in 1955.
Normals 1991–2020 and records since 1942 at Alcove Dam, 3 miles west-southwest, 270 ft higher. NOAA, through RCC-ACIS.
