The Penn Yan 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.
Showers likely
Chance of showers
Mostly cloudy
Sunny; warmer
Mostly sunny
Partly cloudy
Partly cloudy
74° on Nov. 11, 2020, the hottest reading for this week of the year since 1969. Next is 71° in 1989.
Penn Yan’s center stands about 740 ft above sea level. Within three miles the land runs from 700 ft to 1,320 ft, a difference of 620 ft: hilly country. The highest named summit within 15 miles is West Italy Hill, about 2,100 ft, 14 miles west-southwest.
Under the town center the state geologic map shows Genesee Group (shale), from the Late Devonian, 359 to 384 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 14×. 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 6 mi of the line.
Shale. Age: Middle Devonian, 384 to 388 million years old. About 4 mi of the line.
Shale, siltstone. Age: Late Devonian, 359 to 384 million years old. About 3 mi of the line.
Shale. Age: Late Devonian, 359 to 384 million years old. About 2 mi of the line.
Shale. Age: Late Devonian, 359 to 384 million years old. About 2 mi of the line.
Shale, siltstone. Age: Late Devonian, 359 to 384 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. 2 smaller units along the line are not listed.
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 Penn Yan reaches Lake Ontario by way of the Keuka Lake Outlet, the Seneca and the Oswego: about 110 river miles. From the lake it goes down the St. Lawrence to the Atlantic.
Lakes on the way: Seneca Lake and Cayuga Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Penn Yan; river miles along the main stem, rounded.
Penn Yan has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 16° in January. A normal year brings about 57 inches of snow; with the rain, that comes to about 35 inches of water.
On November 14 Penn Yan normally reaches 47° and falls to 32°. The record high is 65°, in 2005; the record low 14°, in 2019. The most rain on this date, 0.62 in, fell in 1972.
Normals 1991–2020 and records since 1969 at Geneva Research Farm, 15 miles north. NOAA, through RCC-ACIS.
