The Pine Ridge 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 sunny
Mostly sunny; warmer
Partly cloudy
Partly cloudy
Partly cloudy
Partly cloudy
Partly cloudy
92° on Nov. 17, 1988, the hottest reading for this week of the year since 1899. Next is 91° in 1921.
Pine Ridge’s center stands about 80 ft above sea level. Within three miles the land runs from 40 ft to 170 ft, a difference of 130 ft: gently rolling country.
Under the town center the state geologic map shows Hawthorn Group, Undifferentiated (sand, clay), from the Miocene, 5.3 to 23 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. Age: Late Eocene, 34 to 38 million years old. About 10 mi of the line.
Sand, clay. Age: Miocene, 5.3 to 23 million years old. About 6 mi of the line.
Sand, clay. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 4 mi of the line.
Sand, clay. Age: Pleistocene to Holocene, less than 2.6 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.
Pine Ridge has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 43° in January. About 52 inches of rain fall in a normal year.
On November 14 Pine Ridge normally reaches 77° and falls to 52°. The record high is 88°, in 2008; the record low 32°, in 1984. The most rain on this date, 3.43 in, fell in 1972.
Normals 1991–2020 and records since 1899 at Inverness 3 SE, 13 miles southeast. NOAA, through RCC-ACIS.
