The Delton 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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74° on Nov. 11, 2022, the hottest reading for this week of the year since 1929. Next is 71° in 2010.
Delton’s center stands about 920 ft above sea level. Within three miles the land runs from 920 ft to 1,060 ft, a difference of 140 ft: gently rolling country.
Under the town center the state geologic map shows Marshall Sandstone, from the Carboniferous, 324 to 359 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 54×. 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. Age: Carboniferous, 324 to 359 million years old. About 16 mi of the line.
Shale. Age: Carboniferous, 324 to 359 million years old. About 8 mi of the line.
Shale. Age: Carboniferous, 324 to 359 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.
Delton has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 19° in January. About 40 inches of rain fall in a normal year.
On November 14 Delton normally reaches 49° and falls to 34°. The record high is 69°, in 2010; the record low 13°, in 1986. The most rain on this date, 1.05 in, fell in 1957.
Normals 1991–2020 and records since 1929 at Gull Lake Biological Station, 7 miles south-southeast. NOAA, through RCC-ACIS.
