The Hartline 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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69° on Nov. 11, 1989, the hottest reading for this week of the year since 1892. Next is 62° in 1990.
Hartline’s center stands about 1,910 ft above sea level. Within three miles the land runs from 1,790 ft to 2,410 ft, a difference of 620 ft: hilly country. The highest named summit within 15 miles is Jack Woods Butte, about 2,820 ft, 12 miles northeast.
Under the town center the state geologic map shows Quaternary nonmarine deposits (silt), from the Pleistocene, less than 2.6 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 18×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Silt. Age: Pleistocene, less than 2.6 million years old. About 15 mi of the line.
Sand, gravel. Age: Pleistocene, less than 2.6 million years old. About 6 mi of the line.
Basalt. Age: Late Oligocene to Early Pliocene, 3.6 to 28 million years old. About 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.
Hartline has a dry-summer warm-summer continental climate. Summer afternoons average 85° in July; winter nights fall to about 19° in December. About 12 inches of rain fall in a normal year.
On November 14 Hartline normally reaches 43° and falls to 26°. The record high is 60°, in 1953; the record low −1°, in 1955. The most rain on this date, 0.99 in, fell in 1966.
Normals 1991–2020 and records since 1892 at Wilbur, 19 miles east-northeast, 250 ft higher. NOAA, through RCC-ACIS.
