The St. Martin 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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6° on Nov. 13, 2019, the coldest reading for this week of the year since 1915. Next is 7° in 1933.
St. Martin’s center stands about 980 ft above sea level. Within three miles the land runs from 910 ft to 1,040 ft, a difference of 130 ft: gently rolling country. The highest named summit within 15 miles is Calebs Hill, about 1,160 ft, 10 miles east-southeast.
Under the town center the state geologic map shows Waynesville and Arnheim Formations, Undivided (shale, limestone), from the Late Ordovician, 445 to 454 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 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.
Shale, limestone. Age: Late Ordovician, 445 to 454 million years old. About 19 mi of the line.
Dolostone. Age: Silurian, 425 to 434 million years old. About 2 mi of the line.
Shale. Age: Silurian, 422 to 445 million years old. About 1 mi of the line.
Shale, limestone. Age: Late Ordovician, 445 to 454 million years old. About 1 mi of the line.
Limestone. Age: Silurian, 422 to 445 million years old. About 0.9 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. Martin reaches the Gulf of America by way of Solomon Run, the East Fork Little Miami, the Little Miami, the Ohio and the Mississippi: about 1,550 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of St. Martin; river miles along the main stem, rounded.
St. Martin has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 22° in January. About 42 inches of rain fall in a normal year.
On November 14 St. Martin normally reaches 52° and falls to 34°. The record high is 77°, in 1931; the record low 9°, in 1976. The most rain on this date, 1.75 in, fell in 1951.
Normals 1991–2020 and records since 1915 from the Wilmington Area threaded record (Wilmington Air Park, 16 miles north-northeast). NOAA, through RCC-ACIS.
