The Rochester 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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77° on Nov. 16, 1993, the hottest reading for this week of the year since 1900. Next is 74° in 2022.
Rochester’s center stands about 40 ft above sea level. Within three miles the land runs from 10 ft to 130 ft, a difference of 120 ft: gently rolling country. The highest named summit within 15 miles is Copicut Hill, about 360 ft, 12 miles west.
Under the town center the state geologic map shows Granite, gneiss, and schist, undivided (granite, gneiss, schist), from the Neoproterozoic, 542 to 1,000 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite, gneiss, schist. Age: Neoproterozoic, 542 to 1,000 million years old. About 8 mi of the line.
Granite. Age: Neoproterozoic, 542 to 1,000 million years old. About 8 mi of the line.
Granite. Age: Neoproterozoic, 600 to 601 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 Rochester reaches the Atlantic Ocean by way of the Sippican: about 1 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Rochester; river miles along the main stem, rounded.
Rochester has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 20° in January. A normal year brings about 31 inches of snow; with the rain, that comes to about 53 inches of water.
On November 14 Rochester normally reaches 53° and falls to 35°. The record high is 67°, in 1982; the record low 17°, in 1986. The most rain on this date, 1.40 in, fell in 1975.
Normals 1991–2020 and records since 1900 at Rochester, 6 miles northwest. NOAA, through RCC-ACIS.
