The McLean 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
Sunny
Sunny
Partly cloudy
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Mostly sunny
3° on Nov. 17, 1959, the coldest reading for this week of the year since 1906. Next is 4° in 2019.
McLean’s center stands about 710 ft above sea level. Within three miles the land runs from 620 ft to 730 ft, a difference of 110 ft: gently rolling country.
Under the town center the state geologic map shows Shelburn-Patoka Formations undivided (shale, limestone), from the Late Pennsylvanian, 304 to 307 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, limestone. Age: Late Pennsylvanian, 304 to 307 million years old. About 18 mi of the line.
Shale, sandstone, limestone. Age: Late Pennsylvanian, 304 to 307 million years old. About 4 mi of the line.
Shale, sandstone, coal. Age: Middle Pennsylvanian to Late Pennsylvanian, 304 to 315 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 McLean reaches the Gulf of America by way of Kickapoo Creek, Salt Creek, the Sangamon, the Illinois and the Mississippi: about 1,370 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of McLean; river miles along the main stem, rounded.
McLean has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 18° in January. A normal year brings about 19 inches of snow; with the rain, that comes to about 40 inches of water.
On November 14 McLean normally reaches 52° and falls to 32°. The record high is 77°, in 1999; the record low 8°, in 1940. The most rain on this date, 1.20 in, fell in 1926.
Normals 1991–2020 and records since 1906 at Lincoln, 14 miles southwest, 130 ft lower. NOAA, through RCC-ACIS.
