The Elk Horn 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.
Partly cloudy
Partly cloudy; warmer
Mostly sunny
Mostly sunny
Partly cloudy
Mostly sunny
Showers likely
−14° on Nov. 12, 2019, the coldest reading for this week of the year since 1893. Next is −7° in 1959.
Elk Horn’s center stands about 1,380 ft above sea level. Within three miles the land runs from 1,220 ft to 1,430 ft, a difference of 210 ft: rolling country.
Under the town center the state geologic map shows Dakata and Windrow Formations (sandstone, shale), from the Early Cretaceous to Late Cretaceous, 94 to 113 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 58×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, shale. Age: Early Cretaceous to Late Cretaceous, 94 to 113 million years old. About 20 mi of the line.
Shale, limestone. Age: Middle Pennsylvanian, 307 to 315 million years old. About 3 mi of the line.
Limestone, shale. Age: Middle Pennsylvanian to Late Pennsylvanian, 299 to 315 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 Elk Horn reaches the Gulf of America by way of Indian Creek, the East Nishnabotna, the Nishnabotna, the Missouri and the Mississippi: about 1,800 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 Elk Horn; river miles along the main stem, rounded.
Elk Horn has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 9° in January. About 35 inches of rain fall in a normal year.
On November 14 Elk Horn normally reaches 47° and falls to 25°. The record high is 78°, in 1999; the record low −7°, in 1959. The most rain on this date, 2.30 in, fell in 1926.
Normals 1991–2020 and records since 1893 at Audubon, 11 miles northeast, 100 ft lower. NOAA, through RCC-ACIS.
