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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Partly cloudy; warmer
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77° on Nov. 11, 1964, the hottest reading for this week of the year since 1893. Next is 76° in 1999.
Mount Vernon’s center stands about 890 ft above sea level. Within three miles the land runs from 700 ft to 890 ft, a difference of 190 ft: gently rolling country.
Under the town center the state geologic map shows Scotch Grove Formation (dolostone), from the Silurian, 431 to 440 million 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 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.
Dolostone. Age: Silurian, 431 to 440 million years old. About 13 mi of the line.
Dolostone, limestone. Age: Middle Devonian, 384 to 394 million years old. About 8 mi of the line.
Dolostone, mudstone. Age: Silurian, 425 to 434 million years old. About 3 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 the Cedar River, the Iowa and the Mississippi: about 1,510 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 hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 11° in January. About 36 inches of rain fall in a normal year.
On November 14 Mount Vernon normally reaches 47° and falls to 28°. The record high is 75°, in 1964; the record low 0°, in 1959. The most rain on this date, 1.42 in, fell in 1956.
Normals 1991–2020 and records since 1893 from the Cedar Rapids Area threaded record (Cedar Rapids Municipal Airport, 16 miles west). NOAA, through RCC-ACIS.
