The Hanna 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
Partly cloudy
Showers likely
Mostly sunny; cooler
Chance of showers
Showers likely
68° on Nov. 15, 1999, the hottest reading for this week of the year since 1881. Next is 67° in 1953.
Hanna’s center stands about 6,810 ft above sea level. Within three miles the land runs from 6,750 ft to 7,380 ft, a difference of 630 ft: hilly country. The highest named summit within 15 miles is Sheephead Mountain, about 8,670 ft, 14 miles south-southwest.
Under the town center the state geologic map shows Hanna Formation (sandstone, shale, conglomerate), from the Paleocene, 56 to 66 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 12×. 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, shale, conglomerate. Age: Paleocene, 56 to 66 million years old. About 16 mi of the line.
Sandstone, shale. Age: Late Cretaceous to Paleocene, 56 to 100 million years old. About 2 mi of the line.
Sandstone, shale. Age: Late Cretaceous, 66 to 100 million years old. About 1 mi of the line.
Sandstone, shale. Age: Late Cretaceous, 66 to 100 million years old. About 0.9 mi of the line.
Shale, sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 0.9 mi of the line.
Shale. Age: Late Cretaceous, 78 to 82 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. 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 Hanna reaches the Gulf of America by way of the Big Ditch, the North Platte, the Platte, the Missouri and the Mississippi: about 2,620 river miles.
Lakes on the way: Seminoe Reservoir and 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 Hanna; river miles along the main stem, rounded.
Hanna has a warm-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 10° in January. A normal year brings about 52 inches of snow; with the rain, that comes to about 11 inches of water.
On November 14 Hanna normally reaches 43° and falls to 18°. The record high is 67°, in 1953; the record low −6°, in 2000. The most rain on this date, 0.25 in, fell in 2005.
Normals 1991–2020 and records since 1881 at Medicine Bow, 18 miles east, 250 ft lower. NOAA, through RCC-ACIS.
