The Ansonia 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.
Ansonia’s center stands about 130 ft above sea level. Within three miles the land runs from 10 ft to 610 ft, a difference of 600 ft: hilly country. The highest named summit within 15 miles is Great Hill, about 1,000 ft, 14 miles north-northwest.
Under the town center the state geologic map shows Pumpkin Ground Member [of Harrison (Prospect) Gneiss], from the Middle Ordovician, 459 to 471 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 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, phyllite. Age: Silurian to Devonian, 359 to 445 million years old. About 7 mi of the line.
Schist. Age: Silurian to Devonian, 359 to 445 million years old. About 4 mi of the line.
Gneiss. Age: Middle Ordovician, 459 to 471 million years old. About 3 mi of the line.
Gneiss, amphibolite. Age: Middle Ordovician, 459 to 471 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.
Gneiss, schist. Age: Neoproterozoic to Cambrian, 487 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. 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 Ansonia reaches Long Island Sound and the Atlantic Ocean by way of Beaver Brook, the Naugatuck and the Housatonic: about 14 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ansonia; river miles along the main stem, rounded.
Ansonia 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 Ansonia 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 south-southwest, 120 ft lower). NOAA, through RCC-ACIS.
