The LeRoy 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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80° on Nov. 16, 2016, the hottest reading for this week of the year since 1960. Next is 79° in 1971.
LeRoy’s center stands about 1,010 ft above sea level. Within three miles the land runs from 980 ft to 1,040 ft, a difference of 60 ft: gently rolling country.
Under the town center the state geologic map shows Alluvium (sand, silt, clay), from the Pleistocene to Holocene, less than 2.6 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. 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, sandstone. Age: Carboniferous, 299 to 324 million years old. About 15 mi of the line.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Limestone, shale. Age: Carboniferous, 299 to 324 million years old. About 3 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 LeRoy reaches the Gulf of America by way of Crooked Creek, the Neosho, the Arkansas and the Mississippi: about 1,310 river miles.
Lakes on the way: Murray Lake and Ozark Lake.
600 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of LeRoy; river miles along the main stem, rounded.
LeRoy has a hot-summer humid continental climate. Summer afternoons average 90° in July; winter nights fall to about 19° in January. About 37 inches of rain fall in a normal year.
On November 14 LeRoy normally reaches 57° and falls to 34°. The record high is 79°, in 1971; the record low 8°, in 1986. The most rain on this date, 0.55 in, fell in 1993.
Normals 1991–2020 and records since 1960 at John Redmond Lake, 13 miles north-northwest. NOAA, through RCC-ACIS.
