The Mount Vernon 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.
Partly cloudy
Partly cloudy; warmer
Mostly sunny
Partly cloudy
Sunny
Mostly sunny
Mostly sunny
77° on Nov. 14, 1993, the hottest reading for this week of the year since 1979. Next is 77° in 2020.
Mount Vernon’s center stands about 1,170 ft above sea level. Within three miles the land runs from 940 ft to 1,470 ft, a difference of 530 ft: hilly country. The highest named summit within 15 miles is Bear Mountain, about 1,710 ft, 13 miles north-northeast.
Under the town center the state geologic map shows Ste. Genevieve and St. Louis Limestones, undivided, from the Carboniferous, 324 to 359 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 28×. 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, siltstone. Age: Carboniferous, 299 to 324 million years old. About 7 mi of the line.
Shale. Age: Devonian to Carboniferous, 324 to 422 million years old. About 5 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 4 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 3 mi of the line.
Conglomerate, sandstone. Age: Carboniferous, 299 to 324 million years old. About 3 mi of the line.
Shale, dolostone. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 smaller units along the line are not listed.
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 Mount Vernon reaches the Gulf of America by way of Town Branch, Renfro Creek, Roundstone Creek, the Rockcastle, the Cumberland, the Ohio and the Mississippi: about 1,630 river miles.
Lakes on the way: Bards Lake, Lake Cumberland and Cordell Hull Reservoir.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mount Vernon; river miles along the main stem, rounded.
Mount Vernon has a humid subtropical climate. Summer afternoons average 86° in July; winter nights fall to about 27° in January. A normal year brings about 7 inches of snow; with the rain, that comes to about 51 inches of water.
On November 14 Mount Vernon normally reaches 59° and falls to 37°. The record high is 77°, in 1993; the record low 8°, in 1986. The most rain on this date, 1.35 in, fell in 2024.
Normals 1991–2020 and records since 1979 at Crab Orchard 6 N, 11 miles north-northwest, 140 ft lower. NOAA, through RCC-ACIS.
