The Yarmouth 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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71° on Nov. 11, 2020, the hottest reading for this week of the year since 1995. Next is 71° in 2022.
Yarmouth’s center stands about 80 ft above sea level. Within three miles the land runs from 0 ft to 230 ft, a difference of 230 ft: rolling country. Open water lies within three miles. The highest named summit within 15 miles is Tarkiln Hill, about 700 ft, 14 miles northwest.
Under the town center the state geologic map shows Silurian - Ordovician Vassalboro Formation (sandstone), from the Late Ordovician to Silurian, 428 to 459 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 35×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite. Age: Carboniferous, 299 to 359 million years old. About 6 mi of the line.
Sandstone. Age: Late Ordovician to Silurian, 428 to 459 million years old. About 5 mi of the line.
Felsic-volcanic, mafic-volcanic. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 2 mi of the line.
Granite. Age: Carboniferous, 299 to 359 million years old. About 2 mi of the line.
Schist, slate. Age: Silurian, 428 to 445 million years old. About 2 mi of the line.
Slate. Age: Neoproterozoic to Ordovician, 445 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. 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 Yarmouth reaches the Atlantic Ocean by way of the Royal: about 4 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Yarmouth; river miles along the main stem, rounded.
Yarmouth has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about 14° in January. A normal year brings about 84 inches of snow; with the rain, that comes to about 50 inches of water.
On November 14 Yarmouth normally reaches 47° and falls to 32°. The record high is 63°, in 2011; the record low 12°, in 2019. The most rain on this date, 4.20 in, fell in 2009.
Normals 1991–2020 and records since 1995 at Gray, 7 miles north-northwest, 300 ft higher. NOAA, through RCC-ACIS.
