The Troy Grove 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.
Sunny
Mostly sunny; warmer
Mostly sunny
Sunny
Mostly sunny
Mostly sunny
Partly cloudy
1° on Nov. 17, 1959, the coldest reading for this week of the year since 1901. Next is 4° in 2019.
Troy Grove’s center stands about 670 ft above sea level. Within three miles the land runs from 610 ft to 700 ft, a difference of 90 ft: gently rolling country.
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 39×. 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: Late Ordovician, 454 to 459 million years old. About 10 mi of the line.
Sandstone, limestone, dolostone. Age: Middle Ordovician to Late Ordovician, 454 to 468 million years old. About 7 mi of the line.
Shale, limestone. Age: Late Pennsylvanian, 304 to 307 million years old. About 3 mi of the line.
Shale. Age: Late Pennsylvanian, 304 to 307 million years old. About 2 mi of the line.
Dolostone. Age: Early Ordovician to Middle Ordovician, 459 to 487 million years old. About 2 mi of the line.
Dolostone, limestone. Age: Late Ordovician, 447 to 459 million years old. About 0.4 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 Troy Grove reaches the Gulf of America by way of the Little Vermilion, the Illinois and the Mississippi: about 1,430 river miles.
Lake on the way: Peoria Lake.
1,190 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Troy Grove; river miles along the main stem, rounded.
Troy Grove has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 14° in January. A normal year brings about 28 inches of snow; with the rain, that comes to about 38 inches of water.
On November 14 Troy Grove normally reaches 49° and falls to 30°. The record high is 76°, in 1989; the record low 6°, in 1986. The most rain on this date, 2.04 in, fell in 1926.
Normals 1991–2020 and records since 1901 at Peru, 8 miles south. NOAA, through RCC-ACIS.
