The Plymouth 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.
Chance of showers
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75° on Nov. 11, 2020, the hottest reading for this week of the year since 1892. Next is 72° in 1956.
Plymouth’s center stands about 1,400 ft above sea level. Within three miles the land runs from 1,120 ft to 2,750 ft, a difference of 1,630 ft: steep hill country. The highest named summit within 15 miles is Killington Peak, about 4,190 ft, 7 miles northwest.
Under the town center the state geologic map shows Plymouth Formation - dolostone member (dolostone, sedimentary-breccia, conglomerate), from the Cambrian, 487 to 542 million years old.
The section below crosses 15 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.
Paragneiss, quartz-feldspar-schist. Age: Mesoproterozoic, 1.2 to 1.4 billion years old. About 5 mi of the line.
Gneiss. Age: Mesoproterozoic, 1.2 to 1.6 billion years old. About 5 mi of the line.
Dolostone, sedimentary-breccia, conglomerate. Age: Cambrian, 487 to 542 million years old. About 3 mi of the line.
Tonalite, trondhjemite. Age: Middle Cambrian to Middle Ordovician, 468 to 504 million years old. About 2 mi of the line.
Phyllite, limestone. Age: Silurian to Early Devonian, 394 to 425 million years old. About 2 mi of the line.
Paragneiss, migmatite. Age: Mesoproterozoic, 1.3 to 1.3 billion years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 9 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 Plymouth reaches Long Island Sound and the Atlantic Ocean by way of Broad Brook, the Ottauquechee and the Connecticut: about 240 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Plymouth; river miles along the main stem, rounded.
Plymouth has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 7° in January. About 42 inches of rain fall in a normal year.
On November 14 Plymouth normally reaches 47° and falls to 27°. The record high is 64°, in 1964; the record low 2°, in 1905. The most rain on this date, 2.39 in, fell in 1937.
Normals 1991–2020 and records since 1892 at Woodstock, 13 miles east-northeast, 800 ft lower. NOAA, through RCC-ACIS.
