The DeWitt 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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−4° on Nov. 17, 1959, the coldest reading for this week of the year since 1893. Next is −2° in 2019.
DeWitt’s center stands about 710 ft above sea level. Within three miles the land runs from 610 ft to 760 ft, a difference of 150 ft: gently rolling country.
Under the town center the state geologic map shows Scotch Grove Formation (dolostone), from the Silurian, 431 to 440 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.
Dolostone. Age: Silurian, 431 to 440 million years old. About 17 mi of the line.
Dolostone. Age: Late Ordovician to Silurian, 434 to 447 million years old. About 6 mi of the line.
Dolostone, mudstone. Age: Silurian, 425 to 434 million years old. About 1 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 DeWitt reaches the Gulf of America by way of Silver Creek, the Wapsipinicon and the Mississippi: about 1,500 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of DeWitt; river miles along the main stem, rounded.
DeWitt has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 14° in January. A normal year brings about 32 inches of snow; with the rain, that comes to about 36 inches of water.
On November 14 DeWitt normally reaches 48° and falls to 31°. The record high is 74°, in 1971; the record low 2°, in 1996. The most rain on this date, 1.14 in, fell in 1926.
Normals 1991–2020 and records since 1893 at Clinton No 1, 15 miles east, 120 ft lower. NOAA, through RCC-ACIS.
