The Dexter 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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73° on Nov. 11, 2020, the hottest reading for this week of the year since 1947. Next is 70° in 2002.
Dexter’s center stands about 460 ft above sea level. Within three miles the land runs from 280 ft to 860 ft, a difference of 580 ft: hilly country. The highest named summit within 15 miles is Guilford Mountain, about 1,310 ft, 14 miles north-northwest.
Under the town center the state geologic map shows Devonian - Silurian Madrid Formation (quartzite, calc-silicate-rock), from the Silurian to Devonian, 359 to 445 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 24×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Quartzite, calc-silicate-rock. Age: Silurian to Devonian, 359 to 445 million years old. About 20 mi of the line.
Granite, granodiorite. Age: Devonian, 359 to 422 million years old. About 3 mi of the line.
Sandstone, shale. Age: Silurian, 422 to 445 million years old. About 0.7 mi of the line.
Shale, sandstone. Age: Silurian, 425 to 434 million years old. About 0.5 mi of the line.
Marble. Age: Silurian, 428 to 445 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.
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 Dexter reaches the Atlantic Ocean by way of the Main Stream Sebasticook, the Sebasticook and the Kennebec: about 140 river miles.
60 miles of the trip are on the Kennebec.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dexter; river miles along the main stem, rounded.
Dexter has a warm-summer humid continental climate. Summer afternoons average 81° in July; winter nights fall to about 6° in January. A normal year brings about 72 inches of snow; with the rain, that comes to about 45 inches of water.
On November 14 Dexter normally reaches 47° and falls to 28°. The record high is 67°, in 2022; the record low 5°, in 2019. The most rain on this date, 1.03 in, fell in 1949.
Normals 1991–2020 and records since 1947 at Corinna, 8 miles south-southeast, 160 ft lower. NOAA, through RCC-ACIS.
