The Greenville 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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69° on Nov. 11, 2020, the hottest reading for this week of the year since 1906. Next is 67° in 2022.
Greenville’s center stands about 840 ft above sea level. Within three miles the land runs from 640 ft to 1,240 ft, a difference of 600 ft: hilly country. The highest named summit within 15 miles is Pack Monadnock Mountain, about 2,270 ft, 7 miles north-northwest.
The section below crosses 12 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.
Quartz-diorite, tonalite, granodiorite. Age: Early Devonian, 394 to 422 million years old. About 9 mi of the line.
Granite, pegmatite. Age: Carboniferous, 299 to 324 million years old. About 4 mi of the line.
Metaclastic. Age: Silurian, 434 to 445 million years old. About 3 mi of the line.
Pelitic-schist, metasandstone. Age: Silurian, 434 to 445 million years old. About 2 mi of the line.
Schist, phyllite. Age: Early Devonian, 394 to 422 million years old. About 1 mi of the line.
Granofels, schist. Age: Neoproterozoic, 542 to 1,000 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. 6 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 Greenville reaches the Atlantic Ocean by way of the Souhegan and the Merrimack: about 90 river miles.
60 miles of the trip are on the Merrimack.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Greenville; river miles along the main stem, rounded.
Greenville has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 14° in January. A normal year brings about 75 inches of snow; with the rain, that comes to about 49 inches of water.
Normals 1991–2020 and records since 1906 at Ashburnham, 12 miles south-southwest, 270 ft higher. NOAA, through RCC-ACIS.
