The Johnston City 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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4.93 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.
Johnston City’s center stands about 440 ft above sea level. Within three miles the land runs from 380 ft to 540 ft, a difference of 160 ft: gently rolling country.
Under the town center the state geologic map shows Shelburn-Patoka Formations undivided (shale, limestone), from the Late Pennsylvanian, 304 to 307 million years old.
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, limestone. Age: Late Pennsylvanian, 304 to 307 million years old. About 24 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 Johnston City reaches the Gulf of America by way of Lake Creek, Pond 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 Johnston City; river miles along the main stem, rounded.
Johnston City 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 Johnston City 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). NOAA, through RCC-ACIS.
