The St. Clairsville 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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85° on Nov. 15, 1956, the hottest reading for this week of the year since 1878. Next is 78° in 1958.
St. Clairsville’s center stands about 1,210 ft above sea level. Within three miles the land runs from 860 ft to 1,300 ft, a difference of 440 ft: hilly country. The highest named summit within 15 miles is Galloway Knob, about 1,370 ft, 6 miles southwest.
Under the town center the state geologic map shows Dunkard Group (mudstone, shale, siltstone), from the Carboniferous to Permian, 252 to 324 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 26×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mudstone, shale, siltstone. Age: Carboniferous to Permian, 252 to 324 million years old. About 15 mi of the line.
Shale, siltstone, mudstone. Age: Carboniferous, 299 to 324 million years old. About 6 mi of the line.
Shale, siltstone, mudstone. Age: Carboniferous, 299 to 324 million years old. About 2 mi of the line.
Sandstone, siltstone, shale. Age: Carboniferous, 299 to 324 million years old. About 0.6 mi of the line.
Fine-detrital, coarse-detrital. Age: Quaternary, less than 2.6 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 St. Clairsville reaches the Gulf of America by way of Aults Run, Little McMahon Creek, McMahon Creek, the Ohio and the Mississippi: about 1,860 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 St. Clairsville; river miles along the main stem, rounded.
St. Clairsville has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 22° in January. About 38 inches of rain fall in a normal year.
On November 14 St. Clairsville normally reaches 52° and falls to 36°. The record high is 74°, in 1989; the record low 10°, in 1920. The most rain on this date, 1.10 in, fell in 1997.
Normals 1991–2020 and records since 1878 from the Wheeling Area threaded record (Wheeling Ohio County Airport, 15 miles east-northeast). NOAA, through RCC-ACIS.
