The North Key Largo 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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10.03 inches of rain fell in two days, the most for this week of the year since records began in 1949. The next wettest, 6.92 inches, fell in 1949.
North Key Largo’s center stands barely above sea level. Within three miles the land runs from 0 ft to 40 ft, a difference of 40 ft: nearly flat ground. Open water lies within three miles.
Under the town center the state geologic map shows Key Largo Limestone, from the Pleistocene, less than 2.6 million years old.
The section below crosses 2 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.
Sand. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Limestone. Age: Pleistocene, 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.
Rain that falls on North Key Largo runs straight into the Atlantic Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of North Key Largo; river miles along the main stem, rounded.
North Key Largo has a tropical monsoon climate. Summer afternoons average 93° in July; winter nights fall to about 55° in January. About 57 inches of rain fall in a normal year.
On November 14 North Key Largo normally reaches 83° and falls to 64°. The record high is 92°, in 2006; the record low 45°, in 1963. The most rain on this date, 3.88 in, fell in 1949.
Normals 1991–2020 and records since 1949 at Royal Palm Ranger Sta, 19 miles west-northwest. NOAA, through RCC-ACIS.
