The Long Island 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
Partly cloudy
Mostly sunny
Partly cloudy
Mostly sunny; warmer
Partly cloudy
Showers likely; warmer
80° on Nov. 14, 1999, the hottest reading for this week of the year since 1894. Next is 80° in 2025.
Long Island’s center stands about 2,070 ft above sea level. Within three miles the land runs from 2,050 ft to 2,250 ft, a difference of 200 ft: gently rolling country. The highest named summit within 15 miles is Sappa Peak, about 2,230 ft, 9 miles north.
Under the town center the state geologic map shows Alluvium (sand, silt, clay), from the Pleistocene to Holocene, less than 2.6 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 56×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 10 mi of the line.
Arkose. Age: Miocene, 5.3 to 23 million years old. About 6 mi of the line.
Siltstone-mudstone, conglomerate-sandstone. Age: Miocene, 5.3 to 23 million years old. About 4 mi of the line.
Shale. Age: Late Cretaceous, 66 to 100 million years old. About 2 mi of the line.
Silt. Age: Pleistocene to Holocene, less than 2.6 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.
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 Long Island reaches the Gulf of America by way of Prairie Dog Creek, the Republican, the Kansas, the Missouri and the Mississippi: about 1,990 river miles.
Lake on the way: Harlan County Lake.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Long Island; river miles along the main stem, rounded.
Long Island has a dry-winter hot-summer continental climate. Summer afternoons average 90° in July; winter nights fall to about 14° in January. A normal year brings about 15 inches of snow; with the rain, that comes to about 25 inches of water.
On November 14 Long Island normally reaches 54° and falls to 27°. The record high is 80°, in 1999; the record low −2°, in 1959. The most rain on this date, 0.20 in, fell in 1972.
Normals 1991–2020 and records since 1894 at Harlan County Lake, 20 miles east-northeast. NOAA, through RCC-ACIS.
