The Gladbrook 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.
Sunny
Partly cloudy; warmer
Mostly sunny
Partly cloudy
Partly cloudy
Mostly sunny
Showers likely
−7° on Nov. 12, 2019, the coldest reading for this week of the year since 1996. Next is 2° in 2005.
Gladbrook’s center stands about 980 ft above sea level. Within three miles the land runs from 930 ft to 1,050 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Lime Creek Formation (shale, limestone, dolostone), from the Late Devonian, 374 to 384 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.
Shale, siltstone. Age: Late Devonian, 359 to 374 million years old. About 12 mi of the line.
Shale, limestone, dolostone. Age: Late Devonian, 374 to 384 million years old. About 9 mi of the line.
Dolostone, limestone, siltstone. Age: Early Mississippian, 347 to 359 million years old. About 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 Gladbrook reaches the Gulf of America by way of Wolf Creek, the Cedar River, the Iowa and the Mississippi: about 1,620 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Gladbrook; river miles along the main stem, rounded.
Gladbrook has a dry-winter hot-summer continental climate. Summer afternoons average 83° in July; winter nights fall to about 10° in January. About 33 inches of rain fall in a normal year.
On November 14 Gladbrook normally reaches 47° and falls to 27°. The record high is 72°, in 2025; the record low 8°, in 2019.
Normals 1991–2020 and records since 1996 at Marshalltown Municipal Airport, 12 miles west-southwest. NOAA, through RCC-ACIS.
