The Grahamsville 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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74° on Nov. 11, 2020, the hottest reading for this week of the year since 1898. Next is 70° in 1956.
Grahamsville’s center stands about 1,020 ft above sea level. Within three miles the land runs from 840 ft to 2,430 ft, a difference of 1,590 ft: steep hill country. The highest named summit within 15 miles is Slide Mountain, about 4,180 ft, 13 miles northeast.
Under the town center the state geologic map shows Lower Walton Formation (sandstone, conglomerate, shale), from the Late Devonian, 359 to 384 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 8×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, sandstone, conglomerate. Age: Late Devonian, 359 to 384 million years old. About 15 mi of the line.
Sandstone, conglomerate, shale. Age: Late Devonian, 359 to 384 million years old. About 7 mi of the line.
Shale, sandstone, conglomerate. Age: Late Devonian, 359 to 384 million 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.
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 Grahamsville reaches New York Harbor and the Atlantic Ocean by way of Chestnut Creek, Rondout Creek and the Hudson: about 140 river miles.
90 miles of the trip are on the Hudson.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Grahamsville; river miles along the main stem, rounded.
Grahamsville has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about 13° in January. A normal year brings about 70 inches of snow; with the rain, that comes to about 53 inches of water.
On November 14 Grahamsville normally reaches 47° and falls to 29°. The record high is 66°, in 1964; the record low 6°, in 1986. The most rain on this date, 1.60 in, fell in 1911.
Normals 1991–2020 and records since 1898 at Liberty 1 NE, 10 miles west-southwest, 560 ft higher. NOAA, through RCC-ACIS.
