The Ashburn 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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3° on Nov. 17, 1959, the coldest reading for this week of the year since 1948. Next is 10° in 1986.
Ashburn’s center stands about 500 ft above sea level. Within three miles the land runs from 450 ft to 820 ft, a difference of 370 ft: rolling country. The highest named summit within 15 miles is Pickerton Hill, about 840 ft, 1 miles west-southwest.
Under the town center the state geologic map shows Kinderhookian Series (limestone, siltstone), from the Carboniferous, 324 to 359 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 41×. 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, siltstone. Age: Carboniferous, 324 to 359 million years old. About 8 mi of the line.
Shale, limestone. Age: Late Ordovician, 445 to 454 million years old. About 7 mi of the line.
Clay, silt, sand. Age: Holocene, less than 12,000 years old. About 4 mi of the line.
Shale. Age: Middle Devonian to Late Devonian, 359 to 388 million years old. About 3 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 1 mi of the line.
Limestone. Age: Middle Ordovician to Late Ordovician, 445 to 471 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. 1 smaller unit 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 Ashburn reaches the Gulf of America by way of the Mississippi: about 1,270 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ashburn; river miles along the main stem, rounded.
Ashburn has a hot-summer humid continental climate. Summer afternoons average 89° in July; winter nights fall to about 21° in January. About 38 inches of rain fall in a normal year.
On November 14 Ashburn normally reaches 55° and falls to 36°. The record high is 81°, in 1999; the record low 10°, in 1986. The most rain on this date, 0.55 in, fell in 1985.
Normals 1991–2020 and records since 1948 at Saverton Lock And Dam 22, 7 miles north-northwest. NOAA, through RCC-ACIS.
