The Old Hill 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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78° on Nov. 15, 1993, the hottest reading for this week of the year since 1948. Next is 72° in 2022.
Old Hill’s center stands about 140 ft above sea level. Within three miles the land runs from 0 ft to 340 ft, a difference of 340 ft: rolling country. The highest named summit within 15 miles is Pine Mountain, about 1,010 ft, 15 miles north-northwest.
Under the town center the state geologic map shows Ordovician? granitic gneiss, from the Early Devonian to Middle Devonian, 393 to 419 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 24×. 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. Age: Early Devonian to Middle Devonian, 393 to 419 million years old. About 8 mi of the line.
Schist, gneiss. Age: Early Ordovician to Middle Ordovician, 459 to 487 million years old. About 2 mi of the line.
Gneiss. Age: Middle Ordovician, 459 to 471 million years old. About 2 mi of the line.
Marble. Age: Early Cambrian to Early Ordovician, 471 to 542 million years old. About 1.0 mi of the line.
Amphibolite, pelitic-schist. Age: Cambrian to Early Ordovician, 471 to 542 million years old. About 0.8 mi of the line.
Schist, granofels. Age: Cambrian to Late Ordovician, 445 to 542 million years old. About 0.7 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 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 Old Hill reaches Long Island Sound and the Atlantic Ocean by way of Poplar Plains Brook and the Saugatuck: about 5 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Old Hill; river miles along the main stem, rounded.
Old Hill has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 25° in January. A normal year brings about 34 inches of snow; with the rain, that comes to about 44 inches of water.
On November 14 Old Hill normally reaches 54° and falls to 39°. The record high is 68°, in 1959; the record low 20°, in 1986. The most rain on this date, 2.84 in, fell in 1972.
Normals 1991–2020 and records since 1948 from the Bridgeport Area threaded record (Igor I Sikorsky Memorial Airport, 13 miles east, 130 ft lower). NOAA, through RCC-ACIS.
