The Lewis 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.
Showers likely
Mostly cloudy
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Mostly sunny; warmer
Partly cloudy
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73° on Nov. 16, 1989, the hottest reading for this week of the year since 1883. Next is 71° in 2002.
Lewis’s center stands about 670 ft above sea level. Within three miles the land runs from 450 ft to 1,630 ft, a difference of 1,180 ft: steep hill country. The highest named summit within 15 miles is Giant Mountain, about 4,590 ft, 11 miles southwest.
Under the town center the state geologic map shows Metanorthosite and anorthositic gneiss (gneiss, metaanorthosite), from the Mesoproterozoic, 1 to 1.6 billion 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 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gneiss, metaanorthosite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 16 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 4 mi of the line.
Anorthosite, metasedimentary. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.
Marble. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 0.4 mi of the line.
Limestone. Age: Middle Ordovician, 459 to 471 million years old. About 0.3 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 Lewis reaches the St. Lawrence River by way of Spruce Mill Brook, the North Branch Boquet, the Boquet and the Richelieu: about 150 river miles. The St. Lawrence carries it on to the Atlantic.
Lake on the way: Lake Champlain.
80 miles of the trip are on the Richelieu.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lewis; river miles along the main stem, rounded.
Lewis has a hot-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 13° in January. A normal year brings about 88 inches of snow; with the rain, that comes to about 38 inches of water.
On November 14 Lewis normally reaches 47° and falls to 33°. The record high is 67°, in 1959; the record low 10°, in 1996. The most rain on this date, 1.14 in, fell in 2009.
Normals 1991–2020 and records since 1883 from the Burlington Area threaded record (Burlington International Airport, 25 miles east-northeast, 340 ft lower). NOAA, through RCC-ACIS.
