The Norwalk 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.
Partly cloudy
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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.
Norwalk’s center stands about 50 ft above sea level. Within three miles the land runs from 0 ft to 270 ft, a difference of 270 ft: rolling country. Open water lies within three miles. The highest named summit within 15 miles is East Long Pond Mountain, about 990 ft, 15 miles north-northwest.
Under the town center the state geologic map shows Trap Falls Formation plus Ordovician? granitic gneiss (schist, gneiss), from the Early Ordovician to Middle Ordovician, 459 to 487 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 26×. 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, gneiss. Age: Early Ordovician to Middle Ordovician, 459 to 487 million years old. About 4 mi of the line.
Gneiss. Age: Early Devonian to Middle Devonian, 393 to 419 million years old. About 4 mi of the line.
Gneiss. Age: Middle Ordovician, 459 to 471 million years old. About 4 mi of the line.
Gneiss. Age: Middle Ordovician, 459 to 471 million years old. About 0.8 mi of the line.
Schist. Age: Early Ordovician to Middle Ordovician, 459 to 487 million years old. About 0.3 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
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.
Rain that falls on Norwalk runs straight into Long Island Sound and the Atlantic Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Norwalk; river miles along the main stem, rounded.
Norwalk 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 Norwalk 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, 15 miles east-northeast). NOAA, through RCC-ACIS.
