The Petersburg 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.
Mostly sunny
Mostly sunny; warmer
Mostly sunny
Sunny
Mostly sunny
Mostly sunny
Mostly sunny
−2° on Nov. 13, 2019, the coldest reading for this week of the year since 1896. Next is 7° in 1959.
Petersburg’s center stands about 460 ft above sea level. Within three miles the land runs from 400 ft to 550 ft, a difference of 150 ft: gently rolling country. The highest named summit within 15 miles is Sefert Hill, about 700 ft, 15 miles north-northeast.
Under the town center the state geologic map shows Carbondale Group (shale, sandstone), from the Carboniferous, 299 to 324 million years old.
The section below crosses 2 rock units mapped at the surface.
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, sandstone. Age: Carboniferous, 299 to 324 million years old. About 18 mi of the line.
Shale, sandstone. Age: Carboniferous, 299 to 324 million years old. About 6 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 Petersburg reaches the Gulf of America by way of Prides Creek, the White River, Big Bayou, the Wabash River Old Channel, the Old Channel Wabash, the Ohio and the Mississippi: about 1,230 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 Petersburg; river miles along the main stem, rounded.
Petersburg has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 24° in January. A normal year brings about 9 inches of snow; with the rain, that comes to about 48 inches of water.
On November 14 Petersburg normally reaches 56° and falls to 37°. The record high is 78°, in 1931; the record low 12°, in 1986. The most rain on this date, 4.64 in, fell in 1993.
Normals 1991–2020 and records since 1896 at Washington 1 W, 12 miles north-northeast. NOAA, through RCC-ACIS.
