The Harlem 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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91° on Nov. 11, 1979, the hottest reading for this week of the year since 1918. Next is 91° in 2006.
Harlem’s center stands about 20 ft above sea level. Within three miles the land runs from 10 ft to 20 ft, a difference of 10 ft: nearly flat ground.
Under the town center the state geologic map shows Shelly sediments of Plio-Pleistocene age (sand, limestone), from the Late Pliocene to Pleistocene, less than 3.6 million years old.
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.
Sand, limestone. Age: Late Pliocene to Pleistocene, less than 3.6 million years old. About 24 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.
Harlem has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 50° in January. About 49 inches of rain fall in a normal year.
On November 14 Harlem normally reaches 80° and falls to 59°. The record high is 86°, in 2024; the record low 35°, in 1932. The most rain on this date, 0.70 in, fell in 1969.
Normals 1991–2020 and records since 1918 at Moore Haven Lock 1, 11 miles northwest. NOAA, through RCC-ACIS.
