The Lake Mohegan 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.
Mostly cloudy
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77° on Nov. 11, 2020, the hottest reading for this week of the year since 1950. Next is 69° in 2022.
Lake Mohegan’s center stands about 520 ft above sea level. Within three miles the land runs from 110 ft to 860 ft, a difference of 750 ft: hilly country. The highest named summit within 15 miles is South Beacon Mountain, about 1,580 ft, 12 miles north-northwest.
Under the town center the state geologic map shows Biotite granite gneiss (biotite-gneiss), from the Mesoproterozoic, 1 to 1.6 billion years old.
The section below crosses 10 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 18×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Biotite-gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 10 mi of the line.
Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.
Granodiorite. Age: Late Devonian, 359 to 384 million years old. About 1 mi of the line.
Pyroxenite. Age: Late Ordovician, 445 to 459 million years old. About 1 mi of the line.
Norite. Age: Late Ordovician, 445 to 459 million years old. About 1 mi of the line.
Mudstone, sandstone, arkose. Age: Late Triassic, 202 to 237 million years old. About 0.9 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 4 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 Lake Mohegan reaches New York Harbor and the Atlantic Ocean by way of the Mohegan Outlet, Peekskill Hollow Creek and the Hudson: about 50 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lake Mohegan; river miles along the main stem, rounded.
Lake Mohegan has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 17° in January. About 50 inches of rain fall in a normal year.
On November 14 Lake Mohegan normally reaches 53° and falls to 32°. The record high is 68°, in 1964; the record low 17°, in 2019. The most rain on this date, 1.18 in, fell in 1955.
Normals 1991–2020 and records since 1950 at Shrub Oak, here. NOAA, through RCC-ACIS.
