The Wassaic 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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76° on Nov. 16, 1993, the hottest reading for this week of the year since 1931. Next is 73° in 1964.
Wassaic’s center stands about 470 ft above sea level. Within three miles the land runs from 420 ft to 1,250 ft, a difference of 830 ft: hilly country. The highest named summit within 15 miles is Bald Peak, about 1,990 ft, 15 miles north-northeast.
The section below crosses 15 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 17×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Phyllite, schist, metagraywacke. Age: Middle Ordovician, 459 to 471 million years old. About 6 mi of the line.
Schist. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 3 mi of the line.
Gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
Gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
Amphibolite, gneiss. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Marble. Age: Cambrian to Early Ordovician, 471 to 542 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 9 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 Wassaic reaches Long Island Sound and the Atlantic Ocean by way of Wassaic Creek, the Tenmile and the Housatonic: about 70 river miles.
50 miles of the trip are on the Housatonic.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Wassaic; river miles along the main stem, rounded.
Wassaic has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 18° in January. About 42 inches of rain fall in a normal year.
On November 14 Wassaic normally reaches 52° and falls to 32°. The record high is 72°, in 1973; the record low 13°, in 1986. The most rain on this date, 2.01 in, fell in 1972.
Normals 1991–2020 and records since 1931 from the Poughkeepsie Area threaded record (Poughkeepsie/Hudson Valley Regional Airport, 21 miles southwest, 320 ft lower). NOAA, through RCC-ACIS.
