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.
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81° on Nov. 12, 1989, the hottest reading for this week of the year since 1962. Next is 81° in 2016.
Mount Vernon’s center stands about 1,190 ft above sea level. Within three miles the land runs from 1,120 ft to 1,320 ft, a difference of 200 ft: rolling country.
Under the town center the state geologic map shows Osagean Series (limestone), from the Carboniferous, 324 to 359 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 40×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 22 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 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.
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 Stahl Creek, the Spring, the Neosho, the Arkansas and the Mississippi: about 1,240 river miles.
Lakes on the way: Murray Lake and Ozark Lake.
600 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 89° in July; winter nights fall to about 22° in January. A normal year brings about 12 inches of snow; with the rain, that comes to about 46 inches of water.
On November 14 Mount Vernon normally reaches 58° and falls to 34°. The record high is 80°, in 1999; the record low 11°, in 2018. The most rain on this date, 1.90 in, fell in 1993.
Normals 1991–2020 and records since 1962 at Billings 1 SW, 14 miles east-southeast, 120 ft higher. NOAA, through RCC-ACIS.
