The Greybull 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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−28° on Nov. 16, 1959, the coldest reading for this week of the year since 1898. Next is −25° in 1955.
Greybull’s center stands about 3,790 ft above sea level. Within three miles the land runs from 3,770 ft to 4,140 ft, a difference of 370 ft: rolling country. The highest named summit within 15 miles is Black Butte, about 5,350 ft, 15 miles north-northeast.
Under the town center the state geologic map shows Alluvium and Colluvium (clay, silt, sand), from the Pleistocene to Holocene, less than 2.6 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 19×. 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, sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 6 mi of the line.
Clay, silt, sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Claystone, shale, sandstone. Age: Eocene, 34 to 56 million years old. About 5 mi of the line.
Gravel. Age: Pleistocene to Holocene, less than 2.6 million years old. About 4 mi of the line.
Shale. Age: Early Cretaceous, 100 to 145 million years old. About 4 mi of the line.
Shale, siltstone. Age: Late Cretaceous, 78 to 83 million years old. About 0.4 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 Greybull reaches the Gulf of America by way of the Bighorn, the Yellowstone, the Missouri and the Mississippi: about 3,210 river miles.
Lakes on the way: Lake Oahe, Lake Sakakawea, Lake Sharpe and Lake Francis Case.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Greybull; river miles along the main stem, rounded.
Greybull has a cold semi-arid climate. Summer afternoons average 93° in July; winter nights fall to about 9° in January. A normal year brings about 20 inches of snow; with the rain, that comes to about 7 inches of water.
On November 14 Greybull normally reaches 47° and falls to 24°. The record high is 71°, in 1953; the record low −19°, in 1959. The most rain on this date, 0.29 in, fell in 1957.
Normals 1991–2020 and records since 1898 at Basin, 7 miles south. NOAA, through RCC-ACIS.
