The Granby 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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13° on Nov. 13, 2019, the coldest reading for this week of the year since 1996. Next is 17° in 1997.
Granby’s center stands about 450 ft above sea level. Within three miles the land runs from 330 ft to 510 ft, a difference of 180 ft: gently rolling country. The highest named summit within 15 miles is The Kingdom, about 750 ft, 12 miles south-southeast.
Under the town center the state geologic map shows Clinton Group (shale), from the Silurian, 434 to 445 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 63×. 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 to Silurian, 434 to 459 million years old. About 9 mi of the line.
Shale. Age: Silurian, 434 to 445 million years old. About 9 mi of the line.
Shale. Age: Silurian, 422 to 428 million years old. About 4 mi of the line.
Dolostone. Age: Silurian, 425 to 428 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.
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 Granby reaches Lake Ontario by way of Ley Creek, Tannery Creek and the Oswego: about 17 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 Granby; river miles along the main stem, rounded.
Granby has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 16° in January. About 40 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1996 at Fulton Oswego County Airport, 5 miles northeast. NOAA, through RCC-ACIS.
