The Holley 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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81° on Nov. 11, 2020, the hottest reading for this week of the year since 1893. Next is 74° in 2022.
Holley’s center stands about 550 ft above sea level. Within three miles the land runs from 410 ft to 670 ft, a difference of 260 ft: rolling country. The highest named summit within 15 miles is Pinnacle Hill, about 760 ft, 14 miles south-southeast.
Under the town center the state geologic map shows Medina Group (sandstone, shale), from the Silurian, 434 to 445 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 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. Age: Late Ordovician, 445 to 459 million years old. About 8 mi of the line.
Dolostone. Age: Silurian, 425 to 434 million years old. About 4 mi of the line.
Shale. Age: Silurian, 422 to 428 million years old. About 4 mi of the line.
Sandstone, shale. Age: Silurian, 434 to 445 million years old. About 3 mi of the line.
Shale. Age: Silurian, 428 to 445 million years old. About 0.9 mi of the line.
Sandstone. Age: Silurian, 428 to 445 million years old. About 0.5 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 Holley reaches Lake Ontario by way of East Branch Sandy Creek and Sandy Creek: about 20 river miles. From the lake it goes down the St. Lawrence to the Atlantic.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Holley; river miles along the main stem, rounded.
Holley has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 17° in February. About 36 inches of rain fall in a normal year.
On November 14 Holley normally reaches 49° and falls to 33°. The record high is 70°, in 1909; the record low 9°, in 1905. The most rain on this date, 0.64 in, fell in 1969.
Normals 1991–2020 and records since 1893 at Brockport, 4 miles east. NOAA, through RCC-ACIS.
