The Jerseyville 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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3.52 inches of rain fell in two days, the most for this week of the year since records began in 1940. The next wettest, 3.36 inches, fell in 2009.
Jerseyville’s center stands about 660 ft above sea level. Within three miles the land runs from 540 ft to 660 ft, a difference of 120 ft: gently rolling country. The highest named summit within 15 miles is Tucker Knob, about 890 ft, 13 miles southwest.
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 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 47×. 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, coal. Age: Middle Pennsylvanian to Late Pennsylvanian, 304 to 315 million years old. About 13 mi of the line.
Limestone. Age: Middle Mississippian, 331 to 347 million years old. About 6 mi of the line.
Limestone. Age: Early Mississippian to Middle Mississippian, 331 to 359 million years old. About 3 mi of the line.
Shale, sandstone. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 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.
A raindrop that lands in Jerseyville reaches the Gulf of America by way of De Arcy Branch, Phils Creek, Macoupin Creek, the Illinois and the Mississippi: about 1,240 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Jerseyville; river miles along the main stem, rounded.
Jerseyville has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 19° in January. A normal year brings about 12 inches of snow; with the rain, that comes to about 42 inches of water.
On November 14 Jerseyville normally reaches 53° and falls to 34°. The record high is 80°, in 1999; the record low 8°, in 1940. The most rain on this date, 1.40 in, fell in 1993.
Normals 1991–2020 and records since 1940 at Jerseyville 2 SW, here. NOAA, through RCC-ACIS.
