The Coplin 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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68° on Nov. 11, 2020, the hottest reading for this week of the year since 1969. Next is 67° in 2002.
Coplin’s center stands about 1,390 ft above sea level. Within three miles the land runs from 1,230 ft to 2,310 ft, a difference of 1,080 ft: steep hill country. The highest named summit within 15 miles is Sugarloaf Mountain, about 4,210 ft, 9 miles east-southeast.
Under the town center the state geologic map shows Devonian gabbro/diorite/ultramafic rocks (gabbro, diorite, ultramafic), from the Devonian, 359 to 422 million years old.
The section below crosses 7 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.
Gabbro, diorite, ultramafic. Age: Devonian, 359 to 422 million years old. About 14 mi of the line.
Mudstone, sandstone. 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 2 mi of the line.
Age: Early Devonian, 394 to 422 million years old. About 2 mi of the line.
Quartzite. Age: Cambrian to Ordovician, 445 to 542 million years old. About 0.6 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 0.5 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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 Coplin reaches the Atlantic Ocean by way of the Nash Stream, the Dead and the Kennebec: about 190 river miles.
Lake on the way: Flagstaff Lake.
140 miles of the trip are on the Kennebec.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Coplin; river miles along the main stem, rounded.
Coplin has a warm-summer humid continental climate. Summer afternoons average 76° in July; winter nights fall to about 0° in January. A normal year brings about 123 inches of snow; with the rain, that comes to about 43 inches of water.
On November 14 Coplin normally reaches 41° and falls to 24°. The record high is 60°, in 2010; the record low 4°, in 2019. The most rain on this date, 0.65 in, fell in 2018.
Normals 1991–2020 and records since 1969 at Rangeley, 12 miles southwest, 140 ft higher. NOAA, through RCC-ACIS.
