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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67° on Nov. 11, 2020, the hottest reading for this week of the year since 1920. Next is 66° in 2022.
Greenville’s center stands about 1,040 ft above sea level. Within three miles the land runs from 1,020 ft to 1,790 ft, a difference of 770 ft: hilly country. The highest named summit within 15 miles is Baker Mountain, about 3,500 ft, 12 miles northeast.
Under the town center the state geologic map shows Devonian Carrabassett Formation, massive pelite member (mudstone), from the Devonian, 359 to 422 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 10×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mudstone. Age: Devonian, 359 to 422 million years old. About 10 mi of the line.
Gabbro. Age: Devonian, 359 to 422 million years old. About 5 mi of the line.
Mudstone, sandstone. Age: Early Devonian, 410 to 414 million years old. About 3 mi of the line.
Granodiorite. Age: Devonian, 359 to 422 million years old. About 2 mi of the line.
Diorite. Age: Devonian, 359 to 422 million years old. About 1 mi of the line.
Quartzite. Age: Cambrian to Ordovician, 445 to 542 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. 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 Greenville reaches the Atlantic Ocean by way of the Eagle Stream, the Big Wilson Stream, the Sebec, the Piscataquis and the Penobscot: about 130 river miles.
Lake on the way: Sebec Lake.
60 miles of the trip are on the Penobscot.
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 75° in July; winter nights fall to about 5° in January. About 44 inches of rain fall in a normal year.
On November 14 Greenville normally reaches 40° and falls to 27°. The record high is 58°, in 1959; the record low 7°, in 2018. The most rain on this date, 1.23 in, fell in 2006.
Normals 1991–2020 and records since 1920 at Greenville Municipal Airport, here, 350 ft higher. NOAA, through RCC-ACIS.
