The Mannsville 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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3.43 inches of rain fell in two days, the most for this week of the year since records began in 1948. The next wettest, 1.67 inches, fell in 1965.
Mannsville’s center stands about 610 ft above sea level. Within three miles the land runs from 360 ft to 900 ft, a difference of 540 ft: hilly country. The highest named summit within 15 miles is Castor Hill, about 1,500 ft, 12 miles east-southeast.
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 14×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Siltstone, shale. Age: Late Ordovician, 445 to 459 million years old. About 8 mi of the line.
Black-shale. Age: Middle Ordovician, 459 to 471 million years old. About 5 mi of the line.
Sandstone. Age: Late Ordovician, 445 to 459 million years old. About 4 mi of the line.
Limestone. Age: Middle Ordovician, 459 to 471 million years old. About 3 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 Mannsville reaches Lake Ontario by way of Big Deerlick Creek and Skinner Creek: about 6 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 Mannsville; river miles along the main stem, rounded.
Mannsville has a warm-summer humid continental climate. Summer afternoons average 78° in July; winter nights fall to about 11° in January. About 48 inches of rain fall in a normal year.
On November 14 Mannsville normally reaches 46° and falls to 30°. The record high is 65°, in 1959; the record low 20°, in 2023. The most rain on this date, 1.20 in, fell in 1985.
Normals 1991–2020 and records since 1948 at Pulaski, 11 miles south-southwest, 210 ft lower. NOAA, through RCC-ACIS.
