The St. Marks 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.
Sunny
Mostly sunny; warmer
Mostly cloudy
Mostly sunny
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22° on Nov. 16, 1940, the coldest reading for this week of the year since 1892. Next is 22° in 1969.
St. Marks’s center stands about 40 ft above sea level. Within three miles the land runs from 0 ft to 80 ft, a difference of 80 ft: gently rolling country.
Under the town center the state geologic map shows St. Marks Formation (limestone), from the Early Miocene, 16 to 23 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.
Limestone. Age: Early Miocene, 16 to 23 million years old. About 18 mi of the line.
Sand, clay. 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 St. Marks reaches the Gulf of America by way of Big Boggy Branch, the Wakulla and the Saint Marks: about 6 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of St. Marks; river miles along the main stem, rounded.
St. Marks has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 40° in January. About 59 inches of rain fall in a normal year.
On November 14 St. Marks normally reaches 73° and falls to 48°. The record high is 85°, in 2005; the record low 26°, in 1977. The most rain on this date, 2.99 in, fell in 2008.
Normals 1991–2020 and records since 1892 from the Tallahassee Area threaded record (Tallahassee Regional Airport, 18 miles north-northwest). NOAA, through RCC-ACIS.
