The Calhoun 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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77° on Nov. 14, 1999, the hottest reading for this week of the year since 1962. Next is 77° in 2010.
Calhoun’s center stands about 540 ft above sea level. Within three miles the land runs from 450 ft to 570 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Mattoon Formation (shale), 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. 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 Calhoun reaches the Gulf of America by way of Little Fox Creek, the Fox River, the Little Wabash, the Ohio and the Mississippi: about 1,240 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Calhoun; river miles along the main stem, rounded.
Calhoun has a hot-summer humid continental climate. Summer afternoons average 88° in July; winter nights fall to about 21° in January. A normal year brings about 16 inches of snow; with the rain, that comes to about 47 inches of water.
On November 14 Calhoun normally reaches 56° and falls to 34°. The record high is 77°, in 1999; the record low 19°, in 1995. The most rain on this date, 2.62 in, fell in 1993.
Normals 1991–2020 and records since 1962 at Lawrenceville 2 WSW, 18 miles east-northeast. NOAA, through RCC-ACIS.
