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.
Partly cloudy
Mostly sunny; warmer
Mostly sunny
Partly cloudy
Partly cloudy
Partly cloudy; cooler
Showers likely
81° on Nov. 15, 2025, the hottest reading for this week of the year since 1906. Next is 80° in 1953.
St. Charles’s center stands about 2,080 ft above sea level. Within three miles the land runs from 1,880 ft to 2,140 ft, a difference of 260 ft: rolling country.
Under the town center the state geologic map shows Eolian Deposits (silt, sand), from the Quaternary, less than 2.6 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 24×. 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, bentonite. Age: Late Cretaceous, 66 to 100 million years old. About 12 mi of the line.
Siltstone-mudstone, conglomerate-sandstone. Age: Miocene, 5.3 to 23 million years old. About 3 mi of the line.
Silt, sand. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Sandstone, limestone, siltstone. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 3 mi of the line.
Coarse-detrital, clay. Age: Quaternary, less than 2.6 million years old. About 2 mi of the line.
Coarse-detrital, fine-detrital. Age: Quaternary, less than 2.6 million years old. About 2 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 St. Charles reaches the Gulf of America by way of Burnt Rock Creek, South Fork Whetstone Creek, the Missouri and the Mississippi: about 2,070 river miles.
Lakes on the way: Lake Francis Case and Lewis and Clark Lake.
1,170 miles of the trip are on the Mississippi.
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 hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 10° in January. A normal year brings about 45 inches of snow; with the rain, that comes to about 27 inches of water.
On November 14 St. Charles normally reaches 48° and falls to 23°. The record high is 80°, in 1990; the record low −24°, in 1959. The most rain on this date, 0.26 in, fell in 2014.
Normals 1991–2020 and records since 1906 at Gregory, 20 miles west-northwest. NOAA, through RCC-ACIS.
