The Harmonsburg 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.
Chance of showers
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75° on Nov. 11, 2020, the hottest reading for this week of the year since 1996. Next is 68° in 2005.
Harmonsburg’s center stands about 1,210 ft above sea level. Within three miles the land runs from 1,050 ft to 1,440 ft, a difference of 390 ft: rolling country. The highest named summit within 15 miles is Round Top, about 1,540 ft, 7 miles east.
Under the town center the state geologic map shows Berea Sandstone through Venango Formation, undivided (shale), from the Late Devonian, 359 to 384 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 33×. 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. Age: Late Devonian, 359 to 384 million years old. About 13 mi of the line.
Siltstone, shale. Age: Carboniferous, 324 to 359 million years old. About 11 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 Harmonsburg reaches the Gulf of America by way of Inlet Run, the Conneaut Outlet, French Creek, the Allegheny, the Ohio and the Mississippi: about 2,110 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 Harmonsburg; river miles along the main stem, rounded.
Harmonsburg has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 17° in January. A normal year brings about 111 inches of snow; with the rain, that comes to about 48 inches of water.
On November 14 Harmonsburg normally reaches 48° and falls to 33°. The record high is 67°, in 2010; the record low 17°, in 1996. The most rain on this date, 0.53 in, fell in 2021.
Normals 1991–2020 and records since 1996 at Springboro 3 WNW, 12 miles north-northwest, 200 ft lower. NOAA, through RCC-ACIS.
