The Selby 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
Sunny; warmer
Partly cloudy
Partly cloudy
Partly cloudy
Partly cloudy
Chance of showers
76° on Nov. 15, 1953, the hottest reading for this week of the year since 1911. Next is 71° in 2005.
Selby’s center stands about 1,900 ft above sea level. Within three miles the land runs from 1,790 ft to 2,010 ft, a difference of 220 ft: rolling country.
Under the town center the state geologic map shows Pierre Shale (shale, bentonite), from the Late Cretaceous, 66 to 100 million years old.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 43×. 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, bentonite. Age: Late Cretaceous, 66 to 100 million years old. About 24 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.
Selby has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 6° in January. A normal year brings about 31 inches of snow; with the rain, that comes to about 18 inches of water.
On November 14 Selby normally reaches 45° and falls to 23°. The record high is 70°, in 2015; the record low −18°, in 1940. The most rain on this date, 0.80 in, fell in 1928.
Normals 1991–2020 and records since 1911 from the Mobridge Area threaded record (Mobridge Municipal Airport, 18 miles west, 190 ft lower). NOAA, through RCC-ACIS.
