The Gray Summit 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
Partly cloudy
Sunny
Sunny
Partly cloudy
Partly cloudy
Partly cloudy
10° on Nov. 12, 2019, the coldest reading for this week of the year since 1987. Next is 13° in 2018.
Gray Summit’s center stands about 670 ft above sea level. Within three miles the land runs from 460 ft to 870 ft, a difference of 410 ft: hilly country. The highest named summit within 15 miles is Tavern Rock, about 880 ft, 9 miles north-northeast.
Under the town center the state geologic map shows Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (dolostone), from the Early Ordovician, 471 to 487 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 42×. 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. Age: Early Ordovician, 471 to 487 million years old. About 12 mi of the line.
Limestone. Age: Middle Ordovician, 459 to 471 million years old. About 5 mi of the line.
Dolostone, limestone, shale. Age: Middle Ordovician, 459 to 471 million years old. About 2 mi of the line.
Dolostone, limestone. Age: Ordovician, 445 to 487 million years old. About 2 mi of the line.
Sandstone, chert. Age: Early Ordovician, 471 to 487 million years old. About 2 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 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 Gray Summit reaches the Gulf of America by way of the Missouri and the Mississippi: about 1,230 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Gray Summit; river miles along the main stem, rounded.
Gray Summit has a hot-summer humid continental climate. Summer afternoons average 90° in July; winter nights fall to about 22° in January. About 40 inches of rain fall in a normal year.
On November 14 Gray Summit normally reaches 57° and falls to 35°. The record high is 80°, in 2025; the record low 13°, in 2018. The most rain on this date, 2.08 in, fell in 1993.
Normals 1991–2020 and records since 1987 at St Louis Spirit Of St Louis Airport, 14 miles northeast, 210 ft lower. NOAA, through RCC-ACIS.
