The Irondequoit 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
Mostly sunny; warmer
Mostly sunny
Partly cloudy
Partly cloudy
8° on Nov. 16, 1933, the coldest reading for this week of the year since 1871. Next is 10° in 1905.
Irondequoit’s center stands about 390 ft above sea level. Within three miles the land runs from 240 ft to 500 ft, a difference of 260 ft: rolling country. The highest named summit within 15 miles is Baker Hill, about 930 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 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 38×. 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: Silurian, 422 to 428 million years old. About 5 mi of the line.
Dolostone. Age: Silurian, 425 to 428 million years old. About 4 mi of the line.
Shale. Age: Late Ordovician, 445 to 459 million years old. About 2 mi of the line.
Shale. Age: Silurian, 422 to 428 million years old. About 1 mi of the line.
Shale. Age: Silurian, 428 to 434 million years old. About 1 mi of the line.
Shale. Age: Silurian, 428 to 445 million years old. About 0.7 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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.
Rain that falls on Irondequoit runs only a short way, about 2 miles, to Lake Ontario. 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 Irondequoit; river miles along the main stem, rounded.
Irondequoit has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 19° in January. A normal year brings about 102 inches of snow; with the rain, that comes to about 35 inches of water.
On November 14 Irondequoit normally reaches 50° and falls to 34°. The record high is 72°, in 1994; the record low 10°, in 1905. The most rain on this date, 1.13 in, fell in 1972.
Normals 1991–2020 and records since 1871 from the Rochester Area threaded record (Frederick Douglass Greater Rochester International Airport, 8 miles southwest, 150 ft higher). NOAA, through RCC-ACIS.
