The Marion 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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Partly cloudy; warmer
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4.93 inches of rain fell in two days, the most for this week of the year since records began in 1898. The next wettest, 4.54 inches, fell in 1993.
Marion’s center stands about 430 ft above sea level. Within three miles the land runs from 410 ft to 530 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Carbondale Formation (shale, sandstone, coal), from the Middle Pennsylvanian to Late Pennsylvanian, 304 to 315 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 57×. 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, sandstone. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old. About 10 mi of the line.
Shale, limestone. Age: Late Pennsylvanian, 304 to 307 million years old. About 10 mi of the line.
Shale, sandstone, coal. Age: Middle Pennsylvanian to Late Pennsylvanian, 304 to 315 million years old. About 4 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 Marion reaches the Gulf of America by way of Crab Orchard Creek, the Big Muddy and the Mississippi: about 1,130 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Marion; river miles along the main stem, rounded.
Marion has a humid subtropical climate. Summer afternoons average 88° in July; winter nights fall to about 25° in January. About 44 inches of rain fall in a normal year.
On November 14 Marion normally reaches 57° and falls to 35°. The record high is 78°, in 1978; the record low 10°, in 1986. The most rain on this date, 1.60 in, fell in 1993.
Normals 1991–2020 and records since 1898 from the Carbondale Area threaded record (Carbondale Southern Illinois Airport, 17 miles west-northwest). NOAA, through RCC-ACIS.
