The Port Henry 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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70° on Nov. 15, 1956, the hottest reading for this week of the year since 1886. Next is 70° in 2002.
Port Henry’s center stands about 210 ft above sea level. Within three miles the land runs from 90 ft to 1,140 ft, a difference of 1,050 ft: steep hill country. The highest named summit within 15 miles is Rocky Peak, about 4,380 ft, 14 miles west-northwest.
The section below crosses 12 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 10×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, limestone. Age: Late Ordovician, 445 to 459 million years old. About 6 mi of the line.
Gneiss, metaanorthosite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 6 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 2 mi of the line.
Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
Dolostone. Age: Middle Ordovician, 459 to 471 million years old. About 1 mi of the line.
Marble. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 0.9 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 6 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 Port Henry reaches the St. Lawrence River by way of Lake Champlain and the Richelieu: about 160 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 Port Henry; river miles along the main stem, rounded.
Port Henry has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 9° in January. A normal year brings about 59 inches of snow; with the rain, that comes to about 39 inches of water.
On November 14 Port Henry normally reaches 45° and falls to 29°. The record high is 67°, in 1959; the record low 0°, in 2019. The most rain on this date, 0.93 in, fell in 2021.
Normals 1991–2020 and records since 1886 at Cornwall, 14 miles east-southeast, 140 ft higher. NOAA, through RCC-ACIS.
