The Lyndon 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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−1° on Nov. 17, 2019, the coldest reading for this week of the year since 1894. Next is 0° in 1916.
Lyndon’s center stands about 740 ft above sea level. Within three miles the land runs from 630 ft to 1,550 ft, a difference of 920 ft: steep hill country. The highest named summit within 15 miles is Burke Mountain, about 3,240 ft, 7 miles east-northeast.
Under the town center the state geologic map shows Waits River Formation - carbonaceous phyllite and limestone member (phyllite, limestone), from the Silurian to Early Devonian, 394 to 425 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 9×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Phyllite, limestone. Age: Silurian to Early Devonian, 394 to 425 million years old. About 10 mi of the line.
Metasandstone, metasiltstone, phyllite. Age: Middle Cambrian to Early Ordovician, 485 to 500 million years old. About 5 mi of the line.
Quartzite. Age: Early Devonian, 394 to 422 million years old. About 4 mi of the line.
Quartzite, phyllite, mica-schist. Age: Early Devonian, 404 to 414 million years old. About 3 mi of the line.
Mica-schist, quartzite. Age: Early Devonian, 394 to 422 million years old. About 1 mi of the line.
Slate, phyllite. Age: Early Devonian, 394 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 Lyndon reaches Long Island Sound and the Atlantic Ocean by way of South Wheelock Branch, the Passumpsic and the Connecticut: about 300 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lyndon; river miles along the main stem, rounded.
Lyndon has a warm-summer humid continental climate. Summer afternoons average 81° in July; winter nights fall to about 9° in January. A normal year brings about 87 inches of snow; with the rain, that comes to about 40 inches of water.
On November 14 Lyndon normally reaches 46° and falls to 29°. The record high is 64°, in 1989; the record low 3°, in 1905. The most rain on this date, 1.64 in, fell in 1937.
Normals 1991–2020 and records since 1894 at Saint Johnsbury, 7 miles south. NOAA, through RCC-ACIS.
