The Unionville 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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14° on Nov. 13, 2019, the coldest reading for this week of the year since 1951. Next is 16° in 1969.
Unionville’s center stands about 720 ft above sea level. Within three miles the land runs from 670 ft to 780 ft, a difference of 110 ft: gently rolling country. The highest named summit within 15 miles is Soapstone Hill, about 1,340 ft, 12 miles east.
Under the town center the state geologic map shows Stones River Group; Ridley Limestone, from the Ordovician, 445 to 487 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 37×. 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: Ordovician, 445 to 487 million years old. About 13 mi of the line.
Limestone. Age: Ordovician, 445 to 487 million years old. About 6 mi of the line.
Limestone. Age: Ordovician, 445 to 487 million years old. About 2 mi of the line.
Limestone, calcarenite. Age: Ordovician, 445 to 487 million years old. About 1 mi of the line.
Shale, limestone. Age: Ordovician, 445 to 487 million years old. About 0.8 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 Unionville reaches the Gulf of America by way of Weakly Creek, North Fork Creek, the Duck, the Tennessee, the Ohio and the Mississippi: about 1,320 river miles.
Lake on the way: Pickwick Lake.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Unionville; river miles along the main stem, rounded.
Unionville has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 29° in January. About 59 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Unionville normally reaches 62° and falls to 37°. The record high is 80°, in 1999; the record low 20°, in 1969. The most rain on this date, 0.96 in, fell in 2007.
Normals 1991–2020 and records since 1951 at Shelbyville Water Dept, 13 miles southeast. NOAA, through RCC-ACIS.
