The Darrtown 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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10° on Nov. 17, 1959, the coldest reading for this week of the year since 1911. Next is 10° in 2019.
Darrtown’s center stands about 750 ft above sea level. Within three miles the land runs from 690 ft to 970 ft, a difference of 280 ft: rolling country. The highest named summit within 15 miles is Cobbs Hill, about 1,020 ft, 15 miles west-southwest.
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 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 35×. 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 10 mi of the line.
Shale, limestone. Age: Late Ordovician, 445 to 459 million years old. About 3 mi of the line.
Shale. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 2 mi of the line.
Dolostone, limestone, shale. Age: Silurian, 422 to 445 million years old. About 0.5 mi of the line.
Limestone, shale. Age: Late Ordovician, 445 to 459 million years old. About 0.3 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 Darrtown reaches the Gulf of America by way of Darrs Run, Four Mile Creek, the Great Miami, the Ohio and the Mississippi: about 1,500 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 Darrtown; river miles along the main stem, rounded.
Darrtown has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 21° in January. About 45 inches of rain fall in a normal year.
On November 14 Darrtown normally reaches 54° and falls to 33°. The record high is 78°, in 1931; the record low 10°, in 2019. The most rain on this date, 1.45 in, fell in 2011.
Normals 1991–2020 and records since 1911 at Fairfield, 11 miles south-southeast, 180 ft lower. NOAA, through RCC-ACIS.
