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.
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7° on Nov. 13, 2019, the coldest reading for this week of the year since 1893. Next is 9° in 1894.
Hillsboro’s center stands about 1,120 ft above sea level. Within three miles the land runs from 910 ft to 1,150 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Brown Hill, about 1,350 ft, 11 miles east-southeast.
Under the town center the state geologic map shows Peebles Dolomite, Lilley and Bisher Formations, Undivided (dolostone), from the Silurian, 425 to 434 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 49×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Silurian, 425 to 434 million years old. About 12 mi of the line.
Shale. Age: Silurian, 422 to 445 million years old. About 10 mi of the line.
Limestone. Age: Silurian, 422 to 445 million years old. About 1 mi of the line.
Shale, limestone, dolostone. Age: Late Ordovician, 445 to 454 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 Hillsboro reaches the Gulf of America by way of Clear Creek, the Rocky Fork, Paint Creek, the Scioto, the Ohio and the Mississippi: about 1,710 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 Hillsboro; river miles along the main stem, rounded.
Hillsboro has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 19° in January. A normal year brings about 18 inches of snow; with the rain, that comes to about 47 inches of water.
On November 14 Hillsboro normally reaches 54° and falls to 32°. The record high is 75°, in 1909; the record low 7°, in 2019. The most rain on this date, 1.76 in, fell in 1972.
Normals 1991–2020 and records since 1893 at Hillsboro, 2 miles north, 170 ft lower. NOAA, through RCC-ACIS.
