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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20° on Nov. 14, 1963, the coldest reading for this week of the year since 1913. Next is 25° in 1969.
Mount Vernon’s center stands about 60 ft above sea level. Within three miles the land runs from 0 ft to 210 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Dove Roost Hill, about 280 ft, 12 miles north-northwest.
Under the town center the state geologic map shows Alluvial, coastal and low terrace deposits (sand), from the Holocene, less than 12,000 years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 60×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand. Age: Holocene, less than 12,000 years old. About 14 mi of the line.
Sand, clay. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 9 mi of the line.
Sand. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 0.6 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 Mount Vernon reaches Mobile Bay and the Gulf of America by way of Cedar Creek and the Mobile: about 40 river miles.
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 90° in July; winter nights fall to about 41° in January. About 72 inches of rain fall in a normal year.
On November 14 Mount Vernon normally reaches 70° and falls to 49°. The record high is 85°, in 1955; the record low 20°, in 1963. The most rain on this date, 5.70 in, fell in 1961.
Normals 1991–2020 and records since 1913 at Bay Minette, 20 miles southeast, 210 ft higher. NOAA, through RCC-ACIS.
