The Asbury 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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−5° on Nov. 12, 2019, the coldest reading for this week of the year since 1873. Next is −2° in 1959.
Asbury’s center stands about 920 ft above sea level. Within three miles the land runs from 660 ft to 1,030 ft, a difference of 370 ft: rolling country. The highest named summit within 15 miles is Sherrill Mound, about 1,220 ft, 7 miles north-northwest.
Under the town center the state geologic map shows Maquoketa formation (shale, dolostone), from the Late Ordovician, 447 to 454 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 32×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, dolostone. Age: Late Ordovician, 447 to 454 million years old. About 9 mi of the line.
Dolostone, limestone. Age: Late Ordovician, 447 to 459 million years old. About 4 mi of the line.
Dolostone. Age: Ordovician, 445 to 487 million years old. About 3 mi of the line.
Dolostone. Age: Late Ordovician to Silurian, 434 to 447 million years old. About 3 mi of the line.
Shale, dolostone. Age: Ordovician, 445 to 487 million years old. About 2 mi of the line.
Dolostone, sandstone. Age: Early Ordovician to Late Ordovician, 454 to 487 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 smaller units 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 Asbury reaches the Gulf of America by way of Cloie Branch, the Little Maquoketa and the Mississippi: about 1,570 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Asbury; river miles along the main stem, rounded.
Asbury has a hot-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 11° in January. A normal year brings about 42 inches of snow; with the rain, that comes to about 38 inches of water.
On November 14 Asbury normally reaches 46° and falls to 29°. The record high is 70°, in 1971; the record low 5°, in 1916. The most rain on this date, 1.11 in, fell in 1956.
Normals 1991–2020 and records since 1873 from the Dubuque Area threaded record (Dubuque Regional Airport, 8 miles south-southeast, 120 ft higher). NOAA, through RCC-ACIS.
