The Dansville 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
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76° on Nov. 11, 2020, the hottest reading for this week of the year since 1893. Next is 72° in 2012.
Dansville’s center stands about 1,810 ft above sea level. Within three miles the land runs from 1,230 ft to 2,110 ft, a difference of 880 ft: hilly country. The highest named summit within 15 miles is Hartsville Hill, about 2,300 ft, 14 miles south-southwest.
Under the town center the state geologic map shows Machias Formation (shale, siltstone, sandstone), from the Late Devonian, 359 to 384 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 13×. 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, siltstone, sandstone. Age: Late Devonian, 359 to 384 million years old. About 12 mi of the line.
Shale, siltstone. Age: Late Devonian, 359 to 384 million years old. About 4 mi of the line.
Shale. Age: Late Devonian, 359 to 384 million years old. About 4 mi of the line.
Sandstone. 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 1 mi of the line.
Sandstone. Age: Late Devonian, 359 to 384 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.
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.
Dansville straddles the St. Lawrence Divide. Rain on the south side runs to Chesapeake Bay and the Atlantic Ocean; most of the rest goes to Lake Ontario.
From the center of town, a raindrop reaches Lake Ontario by way of Stony Brook, Canaseraga Creek and the Genesee: about 90 river miles. From the lake it goes down the St. Lawrence to the Atlantic. One that lands on the south side reaches Chesapeake Bay and the Atlantic Ocean by way of Lime Kiln Creek, the Tioga, the Chemung and the Susquehanna: about 390 river miles.
65 miles of the trip are on the Genesee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dansville; river miles along the main stem, rounded.
Dansville has a warm-summer humid continental climate. Summer afternoons average 81° in July; winter nights fall to about 12° in January. A normal year brings about 82 inches of snow; with the rain, that comes to about 38 inches of water.
On November 14 Dansville normally reaches 47° and falls to 27°. The record high is 67°, in 1994; the record low 7°, in 1939. The most rain on this date, 1.91 in, fell in 1995.
Normals 1991–2020 and records since 1893 at Alfred, 14 miles south-southwest, 110 ft higher. NOAA, through RCC-ACIS.
