The Port Jefferson 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. 11, 2020, the hottest reading for this week of the year since 1948. Next is 72° in 2010.
Port Jefferson’s center stands about 980 ft above sea level. Within three miles the land runs from 950 ft to 1,090 ft, a difference of 140 ft: gently rolling country.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Silurian, 422 to 445 million years old. About 20 mi of the line.
Dolostone. Age: Silurian, 425 to 445 million years old. About 2 mi of the line.
Shale, dolostone, limestone. Age: Ordovician, 445 to 487 million years old. About 1 mi of the line.
Dolostone, limestone, shale. Age: Silurian, 422 to 445 million years old. About 1.0 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.
A raindrop that lands in Port Jefferson reaches the Gulf of America by way of the Great Miami, the Ohio and the Mississippi: about 1,590 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Port Jefferson; river miles along the main stem, rounded.
Port Jefferson has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 18° in January. About 42 inches of rain fall in a normal year.
On November 14 Port Jefferson normally reaches 52° and falls to 32°. The record high is 71°, in 1989; the record low 2°, in 2019. The most rain on this date, 1.93 in, fell in 1972.
Normals 1991–2020 and records since 1948 at Sidney 1 S, 5 miles southwest. NOAA, through RCC-ACIS.
