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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75° on Nov. 15, 1993, the hottest reading for this week of the year since 1972. Next is 74° in 2020.
Hopkinton’s center stands about 490 ft above sea level. Within three miles the land runs from 250 ft to 570 ft, a difference of 320 ft: rolling country. The highest named summit within 15 miles is King Hill, about 860 ft, 13 miles west-southwest.
Under the town center the state geologic map shows Milford granite (granite, granodiorite), from the Neoproterozoic, 615 to 645 million years old.
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 35×. 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. Age: Neoproterozoic, 542 to 1,000 million years old. About 5 mi of the line.
Granite. Age: Neoproterozoic, 542 to 1,000 million years old. About 4 mi of the line.
Granite, granodiorite. Age: Neoproterozoic, 615 to 645 million years old. About 4 mi of the line.
Schist, gneiss. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 3 mi of the line.
Rhyolite. Age: Neoproterozoic, 599 to 605 million years old. About 2 mi of the line.
Alkali-granite. Age: Neoproterozoic, 596 to 606 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. 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 Hopkinton reaches the Atlantic Ocean by way of Indian Brook, the Sudbury, the Concord and the Merrimack: about 85 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 hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 20° in January. A normal year brings about 56 inches of snow; with the rain, that comes to about 50 inches of water.
On November 14 Hopkinton normally reaches 52° and falls to 34°. The record high is 71°, in 1993; the record low 12°, in 1986. The most rain on this date, 0.96 in, fell in 1988.
Normals 1991–2020 and records since 1972 at Walpole 2, 15 miles east-southeast, 320 ft lower. NOAA, through RCC-ACIS.
