The Jeffrey City 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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−31° on Nov. 13, 2014, the coldest reading for this week of the year since 1964. Next is −26° in 2000.
Jeffrey City’s center stands about 6,320 ft above sea level. Within three miles the land runs from 6,280 ft to 6,670 ft, a difference of 390 ft: rolling country. The highest named summit within 15 miles is Crooks Mountain, about 8,310 ft, 8 miles southwest.
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 9 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.
Sandstone. Age: Miocene, 5.3 to 23 million years old. About 9 mi of the line.
Clay, silt, sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 5 mi of the line.
Conglomerate. Age: Eocene, 34 to 56 million years old. About 4 mi of the line.
Amphibolite, hornblende-gneiss, biotite-gneiss. Age: Archean. About 2 mi of the line.
Granite. Age: Archean. About 2 mi of the line.
Shale, siltstone. Age: Late Cretaceous, 78 to 83 million years old. About 0.5 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 3 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.
A raindrop that lands in Jeffrey City reaches the Gulf of America by way of the Sweetwater, the North Platte, the Platte, the Missouri and the Mississippi: about 2,650 river miles.
Lake on the way: Pathfinder Reservoir.
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 Jeffrey City; river miles along the main stem, rounded.
Jeffrey City has a cold semi-arid climate. Summer afternoons average 85° in July; winter nights fall to about 9° in January. A normal year brings about 60 inches of snow; with the rain, that comes to about 10 inches of water.
On November 14 Jeffrey City normally reaches 43° and falls to 18°. The record high is 63°, in 2025; the record low −29°, in 2014. The most rain on this date, 0.50 in, fell in 1993.
Normals 1991–2020 and records since 1964 at Jeffrey City, here. NOAA, through RCC-ACIS.
