The Piqua 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. 11, 2020, the hottest reading for this week of the year since 1948. Next is 72° in 2010.
Piqua’s center stands about 880 ft above sea level. Within three miles the land runs from 840 ft to 1,000 ft, a difference of 160 ft: gently rolling country.
Under the town center the state geologic map shows Clinton and Cataract Groups, Undivided (dolostone, limestone, shale), from the Silurian, 422 to 445 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 61×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone, limestone, shale. Age: Silurian, 422 to 445 million years old. About 7 mi of the line.
Shale, dolostone, limestone. Age: Ordovician, 445 to 487 million years old. About 7 mi of the line.
Dolostone. Age: Silurian, 425 to 445 million years old. About 6 mi of the line.
Dolostone. Age: Silurian, 422 to 445 million years old. About 4 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 Piqua reaches the Gulf of America by way of the Great Miami, the Ohio and the Mississippi: about 1,570 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 Piqua; river miles along the main stem, rounded.
Piqua has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 18° in January. About 42 inches of rain fall in a normal year.
On November 14 Piqua normally reaches 52° and falls to 32°. The record high is 71°, in 1989; the record low 2°, in 2019. The most rain on this date, 1.93 in, fell in 1972.
Normals 1991–2020 and records since 1948 at Sidney 1 S, 10 miles north-northeast. NOAA, through RCC-ACIS.
