The Webb 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
Partly cloudy; warmer
Mostly sunny
Partly cloudy
Partly cloudy
Mostly sunny
Showers likely
76° on Nov. 13, 1999, the hottest reading for this week of the year since 1941. Next is 75° in 2025.
Webb’s center stands about 1,380 ft above sea level. Within three miles the land runs from 1,340 ft to 1,420 ft, a difference of 80 ft: gently 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 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.
Sandstone, shale. Age: Early Cretaceous to Late Cretaceous, 94 to 113 million years old. About 20 mi of the line.
Shale, limestone, dolostone. Age: Late Devonian, 374 to 384 million years old. About 3 mi of the line.
Shale, dolostone. Age: Late Ordovician, 447 to 454 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 Webb reaches the Gulf of America by way of Montgomery Creek, the Little Sioux, the Missouri and the Mississippi: about 1,990 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 Webb; river miles along the main stem, rounded.
Webb has a hot-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 8° in January. A normal year brings about 35 inches of snow; with the rain, that comes to about 32 inches of water.
On November 14 Webb normally reaches 45° and falls to 26°. The record high is 70°, in 1990; the record low −17°, in 1959. The most rain on this date, 0.81 in, fell in 2024.
Normals 1991–2020 and records since 1941 at Sioux Rapids, 8 miles west-southwest. NOAA, through RCC-ACIS.
