The Gwynneville 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.
Mostly cloudy
Mostly cloudy; warmer
Mostly sunny
Sunny
Mostly sunny
Mostly sunny
Mostly sunny
4.44 inches of rain fell in two days, the most for this week of the year since records began in 1903. The next wettest, 3.64 inches, fell in 1955.
Gwynneville’s center stands about 910 ft above sea level. Within three miles the land runs from 830 ft to 930 ft, a difference of 100 ft: gently rolling country.
Under the town center the state geologic map shows Pleasant Mills Formation (dolostone, limestone), from the Silurian, 422 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 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.
Limestone, dolostone. Age: Devonian, 359 to 422 million years old. About 16 mi of the line.
Dolostone, limestone. Age: Silurian, 422 to 445 million years old. About 5 mi of the line.
Limestone. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Limestone, dolostone. Age: Silurian, 422 to 445 million years old. About 0.9 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.
Gwynneville has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 19° in January. A normal year brings about 20 inches of snow; with the rain, that comes to about 48 inches of water.
On November 14 Gwynneville normally reaches 52° and falls to 33°. The record high is 74°, in 1955; the record low 6°, in 2019. The most rain on this date, 3.00 in, fell in 1993.
Normals 1991–2020 and records since 1903 at Greenfield, 10 miles northwest. NOAA, through RCC-ACIS.
