The Hopkinton 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, 1967, the coldest reading for this week of the year since 1868. Next is 0° in 1972.
Hopkinton’s center stands about 520 ft above sea level. Within three miles the land runs from 360 ft to 780 ft, a difference of 420 ft: hilly country. The highest named summit within 15 miles is Knights Hill, about 1,960 ft, 14 miles west.
Under the town center the state geologic map shows Kinsman Granodiorite, from the Early Devonian, 394 to 422 million years old.
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 13×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granodiorite. Age: Early Devonian, 394 to 422 million years old. About 5 mi of the line.
Metaclastic. Age: Silurian, 434 to 445 million years old. About 4 mi of the line.
Quartz-diorite, tonalite, granodiorite. 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 4 mi of the line.
Schist, granofels. Age: Silurian, 425 to 434 million years old. About 3 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. 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 Hopkinton reaches the Atlantic Ocean by way of Cressey Brook, the Contoocook and the Merrimack: about 120 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hopkinton; river miles along the main stem, rounded.
Hopkinton has a warm-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 13° in January. A normal year brings about 68 inches of snow; with the rain, that comes to about 42 inches of water.
On November 14 Hopkinton normally reaches 49° and falls to 29°. The record high is 71°, in 1989; the record low 7°, in 1986. The most rain on this date, 1.92 in, fell in 2009.
Normals 1991–2020 and records since 1868 from the Concord Area threaded record (Concord Municipal Airport, 9 miles east, 180 ft lower). NOAA, through RCC-ACIS.
