The Ethan 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.
Mostly sunny
Mostly sunny; warmer
Mostly sunny
Mostly cloudy
Partly cloudy
Partly cloudy; cooler
Showers likely
−22° on Nov. 14, 1959, the coldest reading for this week of the year since 1893. Next is −15° in 1940.
Ethan’s center stands about 1,350 ft above sea level. Within three miles the land runs from 1,280 ft to 1,370 ft, a difference of 90 ft: gently rolling country.
Under the town center the state geologic map shows Niobrara Formation (chalk, marlstone, shale), from the Late Cretaceous, 66 to 100 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 48×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Chalk, marlstone, shale. Age: Late Cretaceous, 66 to 100 million years old. About 15 mi of the line.
Shale, bentonite. Age: Late Cretaceous, 66 to 100 million years old. About 5 mi of the line.
Quartzite. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 3 mi of the line.
Shale. Age: Late Cretaceous, 66 to 100 million years old. About 0.5 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 Ethan reaches the Gulf of America by way of Twelvemile Creek, the James, the Missouri and the Mississippi: about 2,070 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 Ethan; river miles along the main stem, rounded.
Ethan has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 9° in January. About 21 inches of rain fall in a normal year.
On November 14 Ethan normally reaches 46° and falls to 25°. The record high is 79°, in 2025; the record low −22°, in 1959. The most rain on this date, 0.46 in, fell in 1928.
Normals 1991–2020 and records since 1893 from the Mitchell Area threaded record (Mitchell Airport, 16 miles north). NOAA, through RCC-ACIS.
