The Pearl City 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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72° on Nov. 11, 2022, the hottest reading for this week of the year since 1948. Next is 71° in 1989.
Pearl City’s center stands about 830 ft above sea level. Within three miles the land runs from 800 ft to 1,000 ft, a difference of 200 ft: gently rolling country. The highest named summit within 15 miles is Benton Mound, about 1,260 ft, 14 miles northwest.
Under the town center the state geologic map shows Galena Group (Trenton Limestone) (dolostone, limestone), from the Late Ordovician, 447 to 459 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 52×. 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, limestone. Age: Silurian, 422 to 445 million years old. About 8 mi of the line.
Dolostone, limestone. Age: Late Ordovician, 447 to 459 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.
Sandstone, limestone, dolostone. Age: Middle Ordovician to Late Ordovician, 454 to 468 million years old. About 0.8 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 Pearl City reaches the Gulf of America by way of Yellow Creek, the Pecatonica, the Rock River and the Mississippi: about 1,700 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Pearl City; river miles along the main stem, rounded.
Pearl City 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 34 inches of snow; with the rain, that comes to about 38 inches of water.
On November 14 Pearl City normally reaches 47° and falls to 29°. The record high is 71°, in 1989; the record low 10°, in 1996. The most rain on this date, 2.50 in, fell in 1951.
Normals 1991–2020 and records since 1948 at Freeport Wastewater Plant, 12 miles east. NOAA, through RCC-ACIS.
