The St. Charles 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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−18° on Nov. 16, 1955, the coldest reading for this week of the year since 1919. Next is −2° in 1978.
St. Charles’s center stands about 5,960 ft above sea level. Within three miles the land runs from 5,920 ft to 6,870 ft, a difference of 950 ft: steep hill country. The highest named summit within 15 miles is Paris Peak, about 9,510 ft, 10 miles northwest.
Under the town center the state geologic map shows Alluvial deposits (gravel, sand, silt), from the Quaternary, less than 2.6 million years old.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gravel, sand, silt. Age: Quaternary, less than 2.6 million years old. About 7 mi of the line.
Dolostone, limestone, sandstone. Age: Ordovician to Devonian, 359 to 487 million years old. About 6 mi of the line.
Limestone, dolostone. Age: Cambrian to Ordovician, 445 to 542 million years old. About 3 mi of the line.
Sandstone, limestone. Age: Jurassic, 145 to 202 million years old. About 2 mi of the line.
Mudstone, sandstone, limestone. Age: Triassic, 202 to 252 million years old. About 2 mi of the line.
Age: Neoproterozoic to Cambrian, 487 to 1,000 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. 3 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 St. Charles reaches Great Salt Lake by way of Bear Lake, Mud Lake and the Bear River: about 260 river miles. Great Salt Lake has no outlet to the sea: the water leaves only by evaporating or soaking into the ground.
Lakes on the way: Bear Lake and Mud Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of St. Charles; river miles along the main stem, rounded.
St. Charles has a warm-summer humid continental climate. Summer afternoons average 81° in July; winter nights fall to about 8° in January. A normal year brings about 37 inches of snow; with the rain, that comes to about 11 inches of water.
On November 14 St. Charles normally reaches 41° and falls to 21°. The record high is 60°, in 1967; the record low −2°, in 1978. The most rain on this date, 0.72 in, fell in 1958.
Normals 1991–2020 and records since 1919 at Lifton Pumping Station, 4 miles east. NOAA, through RCC-ACIS.
