The McComb 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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6° on Nov. 17, 1959, the coldest reading for this week of the year since 1893. Next is 6° in 2019.
McComb’s center stands about 770 ft above sea level. Within three miles the land runs from 720 ft to 830 ft, a difference of 110 ft: gently rolling country.
Under the town center the state geologic map shows Salina Group (dolostone), from the Silurian, 422 to 445 million years old.
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.
Dolostone. Age: Silurian, 422 to 445 million years old. About 24 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 McComb reaches Lake Erie by way of Rader Creek, Needles Creek, the Middle Branch Portage and the Portage: about 70 river miles. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of McComb; river miles along the main stem, rounded.
McComb has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 19° in January. A normal year brings about 24 inches of snow; with the rain, that comes to about 38 inches of water.
On November 14 McComb normally reaches 50° and falls to 34°. The record high is 73°, in 1909; the record low 11°, in 1911. The most rain on this date, 1.54 in, fell in 1993.
Normals 1991–2020 and records since 1893 at Findlay Wpcc, 8 miles east-southeast. NOAA, through RCC-ACIS.
