The Bonnie 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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Mostly sunny; warmer
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6° on Nov. 13, 2019, the coldest reading for this week of the year since 1895. Next is 8° in 1959.
Bonnie’s center stands about 440 ft above sea level. Within three miles the land runs from 390 ft to 510 ft, a difference of 120 ft: gently rolling country. The highest named summit within 15 miles is Lowry Hill, about 600 ft, 11 miles east.
Under the town center the state geologic map shows Mattoon Formation (shale), from the Late Pennsylvanian, 304 to 307 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. Age: Late Pennsylvanian, 304 to 307 million years old. About 12 mi of the line.
Shale, sandstone, limestone. Age: Late Pennsylvanian, 304 to 307 million years old. About 12 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 Bonnie reaches the Gulf of America by way of Atchison Creek, the Big Muddy and the Mississippi: about 1,160 river miles.
Lake on the way: Rend Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Bonnie; river miles along the main stem, rounded.
Bonnie has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 22° in January. A normal year brings about 10 inches of snow; with the rain, that comes to about 45 inches of water.
On November 14 Bonnie normally reaches 54° and falls to 35°. The record high is 78°, in 1964; the record low 8°, in 1986. The most rain on this date, 4.41 in, fell in 1993.
Normals 1991–2020 and records since 1895 at Mount Vernon Outland Airport, 9 miles north-northeast. NOAA, through RCC-ACIS.
