The Bar Nunn 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.
Partly cloudy
Mostly sunny
Partly cloudy
Mostly cloudy
Mostly sunny; cooler
Mostly cloudy
Showers likely; cooler
−27° on Nov. 12, 2014, the coldest reading for this week of the year since 1939. Next is −19° in 2000.
Bar Nunn’s center stands about 5,280 ft above sea level. Within three miles the land runs from 5,160 ft to 5,420 ft, a difference of 260 ft: rolling country. The highest named summit within 15 miles is Casper Mountain, about 8,210 ft, 13 miles south.
Under the town center the state geologic map shows Cody Shale (shale, siltstone), from the Late Cretaceous, 78 to 83 million years old.
The section below crosses 13 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 7×. 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, siltstone. Age: Late Cretaceous, 78 to 83 million years old. About 8 mi of the line.
Sand, unconsolidated. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Sandstone, shale. Age: Late Cretaceous, 66 to 100 million years old. About 3 mi of the line.
Shale, sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 3 mi of the line.
Sandstone, shale. Age: Late Cretaceous, 66 to 100 million years old. About 2 mi of the line.
Clay, silt, sand. Age: Pleistocene to Holocene, less than 2.6 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. 7 smaller units along the line are not listed.
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.
Bar Nunn has a warm-summer humid continental climate. Summer afternoons average 89° in July; winter nights fall to about 15° in January. A normal year brings about 72 inches of snow; with the rain, that comes to about 12 inches of water.
On November 14 Bar Nunn normally reaches 47° and falls to 23°. The record high is 68°, in 1999; the record low −10°, in 1978. The most rain on this date, 0.40 in, fell in 2006.
Normals 1991–2020 and records since 1939 from the Casper Area threaded record (Casper-Natrona County Airport, 7 miles west). NOAA, through RCC-ACIS.
