The Hamlin 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
81° on Nov. 11, 2020, the hottest reading for this week of the year since 1893. Next is 74° in 2022.
Hamlin’s center stands about 320 ft above sea level. Within three miles the land runs from 270 ft to 410 ft, a difference of 140 ft: gently rolling country. The highest named summit within 15 miles is Lidke Hill, about 710 ft, 14 miles south-southwest.
Under the town center the state geologic map shows Queenston Shale, from the Late Ordovician, 445 to 459 million years old.
The section below crosses 5 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 10 mi of the line.
Dolostone. Age: Silurian, 425 to 434 million years old. About 4 mi of the line.
Sandstone, shale. Age: Silurian, 434 to 445 million years old. About 1 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 0.4 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.
A raindrop that lands in Hamlin reaches Lake Ontario by way of Cowsucker Creek: about 5 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 Hamlin; river miles along the main stem, rounded.
Hamlin 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 Hamlin 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, 6 miles south-southwest, 180 ft higher. NOAA, through RCC-ACIS.
