The Troy 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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6° on Nov. 11, 1956, the coldest reading for this week of the year since 1949. Next is 7° in 1986.
Troy’s center stands about 1,010 ft above sea level. Within three miles the land runs from 940 ft to 1,690 ft, a difference of 750 ft: hilly country. The highest named summit within 15 miles is Monadnock Mountain, about 3,130 ft, 5 miles east-northeast.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 11×. 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, granodiorite, tonalite. Age: Late Ordovician, 445 to 459 million years old. About 7 mi of the line.
Pelitic-schist, metasandstone. Age: Silurian, 434 to 445 million years old. About 5 mi of the line.
Metasedimentary. Age: Early Devonian, 394 to 422 million years old. About 4 mi of the line.
Granite. Age: Late Devonian, 359 to 384 million years old. About 2 mi of the line.
Felsic-volcanic, mafic-volcanic. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 2 mi of the line.
Pelitic-schist, granofels. Age: Silurian, 422 to 445 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. 3 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 Troy reaches Long Island Sound and the Atlantic Ocean by way of the South Branch Ashuelot, the Ashuelot and the Connecticut: about 180 river miles.
140 miles of the trip are on the Connecticut.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Troy; river miles along the main stem, rounded.
Troy has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 14° in January. A normal year brings about 52 inches of snow; with the rain, that comes to about 47 inches of water.
On November 14 Troy normally reaches 50° and falls to 32°. The record high is 67°, in 1964; the record low 7°, in 1986. The most rain on this date, 1.89 in, fell in 2022.
Normals 1991–2020 and records since 1949 at Tully Lake, 13 miles south, 330 ft lower. NOAA, through RCC-ACIS.
