The Summerhill 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.
Chance of showers
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75° on Nov. 11, 2020, the hottest reading for this week of the year since 1996. Next is 68° in 2005.
Summerhill’s center stands about 1,190 ft above sea level. Within three miles the land runs from 980 ft to 1,420 ft, a difference of 440 ft: hilly country. The highest named summit within 15 miles is Gibson Hill, about 1,600 ft, 13 miles northeast.
Under the town center the state geologic map shows Berea Sandstone through Venango Formation, undivided (shale), from the Late Devonian, 359 to 384 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 32×. 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. Age: Late Devonian, 359 to 384 million years old. About 13 mi of the line.
Siltstone, shale. Age: Carboniferous, 324 to 359 million years old. About 7 mi of the line.
Shale, black-shale. Age: Devonian, 359 to 422 million years old. About 2 mi of the line.
Shale. Age: Late Devonian, 359 to 384 million years old. About 1 mi of the line.
Sandstone, conglomerate. Age: Carboniferous, 299 to 324 million years old. About 0.6 mi of the line.
Siltstone, shale. Age: Late Devonian, 359 to 384 million years old. About 0.4 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.
Summerhill straddles the St. Lawrence Divide. Rain on the east side runs to the Gulf of America; most of the rest goes to Lake Erie.
From the center of town, a raindrop reaches Lake Erie by way of Conneaut Creek: about 60 river miles. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic. One that lands on the east side reaches the Gulf of America by way of Rundelltown Creek, Cussewago Creek, French Creek, the Allegheny, the Ohio and the Mississippi: about 2,130 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Summerhill; river miles along the main stem, rounded.
Summerhill has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 17° in January. A normal year brings about 111 inches of snow; with the rain, that comes to about 48 inches of water.
On November 14 Summerhill normally reaches 48° and falls to 33°. The record high is 67°, in 2010; the record low 17°, in 1996. The most rain on this date, 0.53 in, fell in 2021.
Normals 1991–2020 and records since 1996 at Springboro 3 WNW, 8 miles northwest, 180 ft lower. NOAA, through RCC-ACIS.
