The St. Augustine South 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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4.71 inches of rain fell in two days, the most for this week of the year since records began in 1973. The next wettest, 4.35 inches, fell in 1997.
St. Augustine South’s center stands about 40 ft above sea level. Within three miles the land runs from 0 ft to 70 ft, a difference of 70 ft: gently rolling country. Open water lies within three miles.
Under the town center the state geologic map shows Anastasia Formation (sand, limestone), from the Pleistocene, less than 2.6 million years old.
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.
Sand, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Sand, limestone. Age: Pleistocene, less than 2.6 million years old. About 6 mi of the line.
Sand, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Sand. Age: Holocene, less than 12,000 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 St. Augustine South reaches the Atlantic Ocean by way of the Matanzas: about 7 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of St. Augustine South; river miles along the main stem, rounded.
St. Augustine South has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 48° in January. About 51 inches of rain fall in a normal year.
On November 14 St. Augustine South normally reaches 75° and falls to 58°. The record high is 83°, in 1993; the record low 34°, in 1984. The most rain on this date, 3.20 in, fell in 2001.
Normals 1991–2020 and records since 1973 at St Augustine Wtp, 2 miles north. NOAA, through RCC-ACIS.
