The Portville 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
Mostly cloudy
Mostly cloudy
Sunny
Mostly sunny
Partly cloudy
Partly cloudy
76° on Nov. 11, 2020, the hottest reading for this week of the year since 1909. Next is 71° in 2012.
Portville’s center stands about 1,430 ft above sea level. Within three miles the land runs from 1,420 ft to 2,230 ft, a difference of 810 ft: hilly country. The highest named summit within 15 miles is White Hill, about 2,540 ft, 14 miles east.
Under the town center the state geologic map shows Conneaut Group, undivided (shale, sandstone), from the Late Devonian, 359 to 384 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 19×. 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.
Shale, sandstone. Age: Late Devonian, 359 to 384 million years old. About 12 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 Portville reaches the Gulf of America by way of Dodge Creek, the Allegheny, the Ohio and the Mississippi: about 2,210 river miles.
Lake on the way: Allegheny Reservoir.
970 miles of the trip are on the Ohio.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Portville; river miles along the main stem, rounded.
Portville has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 13° in January. A normal year brings about 65 inches of snow; with the rain, that comes to about 41 inches of water.
Normals 1991–2020 and records since 1909 at Olean, 6 miles west-northwest. NOAA, through RCC-ACIS.
