The Hartman 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.
Showers likely
Mostly cloudy
Partly cloudy
Partly cloudy
Mostly sunny
Mostly sunny
Chance of showers
3.19 inches of rain fell in two days, the most for this week of the year since records began in 1894. The next wettest, 1.14 inches, fell in 1991.
Hartman’s center stands about 3,590 ft above sea level. Within three miles the land runs from 3,470 ft to 3,670 ft, a difference of 200 ft: gently rolling country.
Under the town center the state geologic map shows Niobrara Fm (shale), from the Late Cretaceous, 66 to 100 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 35×. 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. Age: Late Cretaceous, 66 to 100 million years old. About 9 mi of the line.
Sandstone, conglomerate. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 8 mi of the line.
Sand, silt. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Shale, limestone. Age: Early Cretaceous to Late Cretaceous, 66 to 145 million years old. About 3 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 2 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 Hartman reaches the Gulf of America by way of the Arkansas and the Mississippi: about 1,680 river miles.
Lakes on the way: Murray Lake and Ozark Lake.
780 miles of the trip are on the Arkansas.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hartman; river miles along the main stem, rounded.
Hartman has a cold semi-arid climate. Summer afternoons average 94° in July; winter nights fall to about 15° in January. A normal year brings about 22 inches of snow; with the rain, that comes to about 17 inches of water.
On November 14 Hartman normally reaches 58° and falls to 25°. The record high is 82°, in 1932; the record low −6°, in 2014. The most rain on this date, 0.25 in, fell in 2004.
Normals 1991–2020 and records since 1894 at Holly, 7 miles southeast, 190 ft lower. NOAA, through RCC-ACIS.
