The Clarksville 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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79° on Nov. 16, 1990, the hottest reading for this week of the year since 1948. Next is 79° in 2020.
Clarksville’s center stands about 800 ft above sea level. Within three miles the land runs from 760 ft to 1,280 ft, a difference of 520 ft: hilly country. The highest named summit within 15 miles is Turkey Knob, about 1,480 ft, 10 miles south-southeast.
Under the town center the state geologic map shows Monongahela Group (limestone, shale, sandstone), from the Carboniferous, 299 to 324 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 27×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, shale. Age: Permian, 252 to 299 million years old. About 8 mi of the line.
Limestone, shale, sandstone. Age: Carboniferous, 299 to 324 million years old. About 5 mi of the line.
Sandstone, shale. Age: Permian, 252 to 299 million years old. About 5 mi of the line.
Sandstone, shale. Age: Carboniferous to Permian, 252 to 324 million years old. About 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 Clarksville reaches the Gulf of America by way of Tenmile Creek, the Monongahela, the Ohio and the Mississippi: about 2,020 river miles.
970 miles of the trip are on the Ohio.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Clarksville; river miles along the main stem, rounded.
Clarksville has a warm-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 19° in January. A normal year brings about 30 inches of snow; with the rain, that comes to about 43 inches of water.
On November 14 Clarksville normally reaches 54° and falls to 30°. The record high is 75°, in 1989; the record low 8°, in 1986. The most rain on this date, 0.54 in, fell in 1997.
Normals 1991–2020 and records since 1948 at Waynesburg 1 E, 8 miles southwest, 140 ft higher. NOAA, through RCC-ACIS.
