The Granville 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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−6° on Nov. 13, 2019, the coldest reading for this week of the year since 1981. Next is 0° in 1986.
Granville’s center stands about 1,010 ft above sea level. Within three miles the land runs from 950 ft to 2,830 ft, a difference of 1,880 ft: steep hill country. The highest named summit within 15 miles is Mount Ellen, about 4,060 ft, 13 miles north-northwest.
Under the town center the state geologic map shows Pinney Hollow Formation - phyllite member, from the Neoproterozoic to Cambrian, 487 to 1,000 million years old.
The section below crosses 22 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Phyllite, muscovite-schist. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 5 mi of the line.
Slate, phyllite, mica-schist. Age: Silurian to Early Devonian, 394 to 425 million years old. About 3 mi of the line.
Mica-schist, phyllite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 2 mi of the line.
Phyllite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 2 mi of the line.
Granofels, quartzite. Age: Cambrian to Early Ordovician, 471 to 542 million years old. About 2 mi of the line.
Gneiss. Age: Mesoproterozoic, 1.2 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. 16 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 Granville reaches Long Island Sound and the Atlantic Ocean by way of the White River and the Connecticut: about 270 river miles.
220 miles of the trip are on the Connecticut.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Granville; river miles along the main stem, rounded.
Granville has a warm-summer humid continental climate. Summer afternoons average 76° in July; winter nights fall to about 6° in January. A normal year brings about 112 inches of snow; with the rain, that comes to about 49 inches of water.
On November 14 Granville normally reaches 44° and falls to 25°. The record high is 66°, in 2005; the record low −5°, in 2019. The most rain on this date, 0.95 in, fell in 1984.
Normals 1991–2020 and records since 1981 at South Lincoln, 9 miles northwest, 330 ft higher. NOAA, through RCC-ACIS.
