The Corwin 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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5° on Nov. 13, 2019, the coldest reading for this week of the year since 1916. Next is 9° in 1933.
Corwin’s center stands about 740 ft above sea level. Within three miles the land runs from 710 ft to 1,010 ft, a difference of 300 ft: rolling country. The highest named summit within 15 miles is Miamisburg Mound, about 930 ft, 13 miles west-northwest.
Under the town center the state geologic map shows Grant Lake and Fairview Formations, Miamitown Shale, Undivided (shale, limestone), from the Late Ordovician, 445 to 459 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 45×. 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, limestone. Age: Late Ordovician, 445 to 454 million years old. About 10 mi of the line.
Shale, limestone. Age: Late Ordovician, 445 to 454 million years old. About 9 mi of the line.
Shale, limestone. Age: Late Ordovician, 445 to 459 million years old. About 3 mi of the line.
Limestone. Age: Silurian, 422 to 445 million years old. About 2 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 Corwin reaches the Gulf of America by way of the Little Miami, the Ohio and the Mississippi: about 1,540 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 Corwin; river miles along the main stem, rounded.
Corwin has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 23° in January. A normal year brings about 20 inches of snow; with the rain, that comes to about 43 inches of water.
On November 14 Corwin normally reaches 54° and falls to 36°. The record high is 76°, in 1931; the record low 10°, in 1986. The most rain on this date, 1.09 in, fell in 2024.
Normals 1991–2020 and records since 1916 at Xenia 6 SSE, 11 miles east-northeast, 210 ft higher. NOAA, through RCC-ACIS.
