The Cynthiana 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.
Cynthiana’s center stands about 970 ft above sea level. Within three miles the land runs from 860 ft to 1,260 ft, a difference of 400 ft: rolling country. The highest named summit within 15 miles is Brown Hill, about 1,350 ft, 4 miles west-southwest.
Under the town center the state geologic map shows Ohio Shale (shale, black-shale), from the Devonian, 359 to 422 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 28×. 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, black-shale. Age: Devonian, 359 to 422 million years old. About 11 mi of the line.
Dolostone. Age: Silurian, 425 to 434 million years old. About 8 mi of the line.
Shale, siltstone, sandstone. Age: Devonian to Carboniferous, 324 to 422 million years old. About 3 mi of the line.
Dolostone. Age: Silurian, 428 to 445 million years old. About 2 mi of the line.
Shale, sandstone. Age: Devonian to Carboniferous, 324 to 422 million years old. About 0.5 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 Cynthiana reaches the Gulf of America by way of the Muddy Fork, the Baker Fork, Ohio Brush Creek, the Ohio and the Mississippi: about 1,620 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 Cynthiana; river miles along the main stem, rounded.
Cynthiana 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 Cynthiana 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, 15 miles west-northwest. NOAA, through RCC-ACIS.
