The Johnstown 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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77° on Nov. 11, 2020, the hottest reading for this week of the year since 1950. Next is 76° in 1994.
Johnstown’s center stands about 1,140 ft above sea level. Within three miles the land runs from 1,030 ft to 1,240 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Rich Hill, about 1,380 ft, 12 miles north.
Under the town center the state geologic map shows Berea Sandstone and Bedford Shale, Undivided (sandstone, shale), from the Devonian, 359 to 422 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 41×. 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, siltstone, sandstone. Age: Devonian to Carboniferous, 324 to 422 million years old. About 16 mi of the line.
Sandstone, shale. Age: Devonian, 359 to 422 million years old. About 5 mi of the line.
Shale, black-shale. Age: Devonian, 359 to 422 million years old. About 3 mi of the line.
Black-shale. Age: Carboniferous, 324 to 359 million years old. About 0.9 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 Johnstown reaches the Gulf of America by way of Raccoon Creek, the Licking, the Muskingum, the Ohio and the Mississippi: about 1,900 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Johnstown; river miles along the main stem, rounded.
Johnstown has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 17° in January. About 44 inches of rain fall in a normal year.
On November 14 Johnstown normally reaches 51° and falls to 32°. The record high is 71°, in 1989; the record low 4°, in 2019. The most rain on this date, 1.20 in, fell in 1972.
Normals 1991–2020 and records since 1950 at Centerburg 2 SE, 10 miles north. NOAA, through RCC-ACIS.
