The Killingly 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 1974. Next is 70° in 2020.
Killingly’s center stands about 480 ft above sea level. Within three miles the land runs from 210 ft to 790 ft, a difference of 580 ft: hilly country. The highest named summit within 15 miles is Coatney Hill, about 990 ft, 12 miles northwest.
Under the town center the state geologic map shows Quartzite unit [in Plainfield Formation], from the Neoproterozoic, 542 to 1,000 million years old.
The section below crosses 16 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 29×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gneiss, amphibolite. Age: Neoproterozoic, 542 to 1,000 million years old. About 4 mi of the line.
Granite. Age: Late Devonian, 366 to 380 million years old. About 3 mi of the line.
Gneiss. Age: Devonian, 359 to 422 million years old. About 2 mi of the line.
Schist, calc-silicate-rock. Age: Neoproterozoic, 542 to 1,000 million years old. About 2 mi of the line.
Schist. Age: Silurian to Devonian, 359 to 445 million years old. About 2 mi of the line.
Quartzite. 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. 10 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 Killingly reaches Long Island Sound and the Atlantic Ocean by way of Whetstone Brook, the Fivemile, the Quinebaug, the Shetucket and the Thames: about 50 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Killingly; river miles along the main stem, rounded.
Killingly has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 19° in January. A normal year brings about 62 inches of snow; with the rain, that comes to about 54 inches of water.
On November 14 Killingly normally reaches 50° and falls to 33°. The record high is 72°, in 1993; the record low 11°, in 1986. The most rain on this date, 2.03 in, fell in 2009.
Normals 1991–2020 and records since 1974 at North Foster 1 E, 6 miles east-northeast, 150 ft higher. NOAA, through RCC-ACIS.
