The Hebron 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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71° on Nov. 16, 2001, the hottest reading for this week of the year since 1996. Next is 71° in 2020.
Hebron’s center stands about 550 ft above sea level. Within three miles the land runs from 350 ft to 770 ft, a difference of 420 ft: hilly country. The highest named summit within 15 miles is Grant Hill, about 970 ft, 11 miles north.
Under the town center the state geologic map shows Canterbury Gneiss (biotite-gneiss), from the Devonian, 359 to 422 million years old.
The section below crosses 11 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 25×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Schist, calc-silicate-rock. Age: Neoproterozoic, 542 to 1,000 million years old. About 5 mi of the line.
Biotite-gneiss. Age: Devonian, 359 to 422 million years old. About 4 mi of the line.
Gneiss, schist. Age: Neoproterozoic, 542 to 1,000 million years old. About 4 mi of the line.
Gneiss. Age: Middle Ordovician, 459 to 471 million years old. About 2 mi of the line.
Gneiss. Age: Neoproterozoic, 542 to 1,000 million years old. About 2 mi of the line.
Schist. Age: Neoproterozoic, 542 to 1,000 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. 5 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 Hebron reaches Long Island Sound and the Atlantic Ocean by way of Fawn Brook, the Blackledge, the Salmon and the Connecticut: about 35 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hebron; river miles along the main stem, rounded.
Hebron has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 18° in January. About 43 inches of rain fall in a normal year.
On November 14 Hebron normally reaches 52° and falls to 32°. The record high is 68°, in 2016; the record low 14°, in 2019. The most rain on this date, 0.76 in, fell in 2009.
Normals 1991–2020 and records since 1996 at Willimantic Windham Airport, 11 miles east-northeast, 300 ft lower. NOAA, through RCC-ACIS.
