The De Witt 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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81° on Nov. 14, 1999, the hottest reading for this week of the year since 1893. Next is 79° in 1949.
De Witt’s center stands about 740 ft above sea level. Within three miles the land runs from 630 ft to 780 ft, a difference of 150 ft: gently rolling country.
Under the town center the state geologic map shows Holocene series (clay, silt, sand), from the Holocene, less than 12,000 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.
Clay, silt, sand. Age: Holocene, less than 12,000 years old. About 12 mi of the line.
Shale, sandstone, siltstone. Age: Carboniferous, 299 to 324 million years old. About 9 mi of the line.
Limestone, shale. Age: Carboniferous, 299 to 324 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 De Witt reaches the Gulf of America by way of the Missouri and the Mississippi: about 1,420 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 De Witt; river miles along the main stem, rounded.
De Witt has a hot-summer humid continental climate. Summer afternoons average 88° in July; winter nights fall to about 17° in January. A normal year brings about 13 inches of snow; with the rain, that comes to about 40 inches of water.
On November 14 De Witt normally reaches 54° and falls to 32°. The record high is 81°, in 1999; the record low 11°, in 2018. The most rain on this date, 0.48 in, fell in 1993.
Normals 1991–2020 and records since 1893 at Carrollton, 14 miles west. NOAA, through RCC-ACIS.
