The Groveton 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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Mostly cloudy; warmer
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−4° on Nov. 17, 2019, the coldest reading for this week of the year since 1996. Next is −1° in 1996.
Groveton’s center stands about 890 ft above sea level. Within three miles the land runs from 850 ft to 2,250 ft, a difference of 1,400 ft: steep hill country. The highest named summit within 15 miles is Mount Cabot, about 4,150 ft, 8 miles southeast.
Under the town center the state geologic map shows Perry Mountain Formation, Sedimentary and subordinate distal felsic and mafic volcanic facies in Piermont allochthon (metaclastic), from the Silurian, 422 to 445 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 7×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Syenite. Age: Jurassic, 145 to 202 million years old. About 6 mi of the line.
Metasandstone, metasiltstone, phyllite. Age: Middle Cambrian to Early Ordovician, 485 to 500 million years old. About 5 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 5 mi of the line.
Metaclastic. Age: Silurian, 422 to 445 million years old. About 4 mi of the line.
Quartz-syenite, syenite. Age: Late Ordovician, 445 to 459 million years old. About 2 mi of the line.
Granite. Age: Jurassic, 145 to 202 million years old. About 0.8 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 Groveton reaches Long Island Sound and the Atlantic Ocean by way of the Upper Ammonoosuc and the Connecticut: about 330 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Groveton; river miles along the main stem, rounded.
Groveton has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 5° in January. About 37 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1996 at Whitefield Mount Washington Regional Airport, 16 miles south, 160 ft higher. NOAA, through RCC-ACIS.
