The Cincinnati 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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78° on Nov. 15, 1999, the hottest reading for this week of the year since 1970. Next is 76° in 2001.
Cincinnati’s center stands about 1,040 ft above sea level. Within three miles the land runs from 890 ft to 1,040 ft, a difference of 150 ft: gently rolling country.
Under the town center the state geologic map shows Marmaton Group (shale, limestone), from the Middle Pennsylvanian, 307 to 315 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 64×. 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: Middle Pennsylvanian, 307 to 315 million years old. About 20 mi of the line.
Shale, siltstone. Age: Middle Pennsylvanian, 307 to 315 million years old. About 2 mi of the line.
Shale, sandstone, siltstone. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old. About 1 mi of the line.
Limestone, shale. Age: Middle Pennsylvanian to Late Pennsylvanian, 299 to 315 million years old. About 0.6 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 Cincinnati reaches the Gulf of America by way of Shoal Creek, the Chariton, the Missouri and the Mississippi: about 1,530 river miles.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Cincinnati; river miles along the main stem, rounded.
Cincinnati has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 13° in January. About 39 inches of rain fall in a normal year.
On November 14 Cincinnati normally reaches 50° and falls to 30°. The record high is 73°, in 1989; the record low 4°, in 1986. The most rain on this date, 0.81 in, fell in 1972.
Normals 1991–2020 and records since 1970 at Rathbun Dam, 13 miles north. NOAA, through RCC-ACIS.
