The Lisbon 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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Mostly sunny; warmer
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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.
Lisbon’s center stands about 700 ft above sea level. Within three miles the land runs from 530 ft to 1,540 ft, a difference of 1,010 ft: steep hill country. The highest named summit within 15 miles is Mount Lafayette, about 5,200 ft, 14 miles east-southeast.
Under the town center the state geologic map shows Ammonoosuc Volcanics, Bimodal volcanic rocks (felsic-volcanic, mafic-volcanic), from the Middle Ordovician to Late Ordovician, 445 to 471 million years old.
The section below crosses 18 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 6×. 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. Age: Early Devonian, 394 to 422 million years old. About 4 mi of the line.
Metasandstone, metasiltstone, phyllite. Age: Middle Cambrian to Early Ordovician, 485 to 500 million years old. About 3 mi of the line.
Granodiorite. Age: Early Devonian, 394 to 422 million years old. About 2 mi of the line.
Granodiorite. Age: Early Devonian, 394 to 422 million years old. About 2 mi of the line.
Granite. Age: Middle Jurassic to Late Jurassic, 145 to 175 million years old. About 2 mi of the line.
Metagraywacke. Age: Early Devonian, 410 to 414 million 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. 12 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 Lisbon reaches Long Island Sound and the Atlantic Ocean by way of the Ammonoosuc and the Connecticut: about 280 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lisbon; river miles along the main stem, rounded.
Lisbon 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 Lisbon 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, 15 miles north-northwest. NOAA, through RCC-ACIS.
