The Hillsboro 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
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80° on Nov. 17, 1958, the hottest reading for this week of the year since 1893. Next is 79° in 1964.
Hillsboro’s center stands about 1,060 ft above sea level. Within three miles the land runs from 1,000 ft to 1,440 ft, a difference of 440 ft: hilly country. The highest named summit within 15 miles is West Ramsey, about 2,140 ft, 15 miles southeast.
Under the town center the state geologic map shows St. Louis Limestone and Warsaw Limestone, from the Carboniferous, 324 to 359 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 18×. 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: Carboniferous, 324 to 359 million years old. About 13 mi of the line.
Conglomerate. Age: Carboniferous, 299 to 324 million years old. About 8 mi of the line.
Chert. Age: Carboniferous, 324 to 359 million years old. About 2 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 0.5 mi of the line.
Shale. Age: Carboniferous, 324 to 359 million years old. About 0.5 mi of the line.
Shale, limestone. Age: Ordovician, 445 to 487 million years old. About 0.3 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 Hillsboro reaches the Gulf of America by way of Collier Branch, Bradley Creek, the Elk River, the Tennessee, the Ohio and the Mississippi: about 1,470 river miles.
Lakes on the way: Guntersville Lake, White Lake (historical), Pickwick Lake and Woods Reservoir.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hillsboro; river miles along the main stem, rounded.
Hillsboro has a humid subtropical climate. Summer afternoons average 87° in July; winter nights fall to about 29° in January. About 61 inches of rain fall in a normal year, with about 3 inches of snow.
On November 14 Hillsboro normally reaches 60° and falls to 37°. The record high is 79°, in 1964; the record low 18°, in 1907. The most rain on this date, 1.64 in, fell in 1915.
Normals 1991–2020 and records since 1893 at Tullahoma, 14 miles west-southwest. NOAA, through RCC-ACIS.
