The Corydon 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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3.70 inches of rain fell in two days, the most for this week of the year since records began in 1888. The next wettest, 3.52 inches, fell in 1957.
Corydon’s center stands about 450 ft above sea level. Within three miles the land runs from 370 ft to 480 ft, a difference of 110 ft: gently rolling country. The highest named summit within 15 miles is Steamport Hill, about 640 ft, 14 miles southeast.
Under the town center the state geologic map shows Sturgis Formation (siltstone), from the Carboniferous, 299 to 324 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.
Siltstone. Age: Carboniferous, 299 to 324 million years old. About 13 mi of the line.
Shale, sandstone. Age: Carboniferous, 299 to 324 million years old. About 6 mi of the line.
Sand, silt. Age: Pleistocene to Holocene, less than 2.6 million years old. About 5 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 Corydon reaches the Gulf of America by way of Beaverdam Creek, Highland Creek, the Ohio and the Mississippi: about 1,130 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Corydon; river miles along the main stem, rounded.
Corydon has a humid subtropical climate. Summer afternoons average 88° in July; winter nights fall to about 23° in January. A normal year brings about 8 inches of snow; with the rain, that comes to about 47 inches of water.
On November 14 Corydon normally reaches 57° and falls to 36°. The record high is 83°, in 1955; the record low 12°, in 1986. The most rain on this date, 2.64 in, fell in 1957.
Normals 1991–2020 and records since 1888 at Mount Vernon, 17 miles northwest. NOAA, through RCC-ACIS.
