The Kahlotus 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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73° on Nov. 12, 1999, the hottest reading for this week of the year since 1905. Next is 69° in 1990.
Kahlotus’s center stands about 900 ft above sea level. Within three miles the land runs from 860 ft to 1,490 ft, a difference of 630 ft: hilly country.
Under the town center the state geologic map shows Miocene volcanic rocks (basalt), from the Late Oligocene to Early Pliocene, 3.6 to 28 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 17×. 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 17 mi of the line.
Basalt. Age: Late Oligocene to Early Pliocene, 3.6 to 28 million years old. About 6 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.
Kahlotus has a cold semi-arid climate. Summer afternoons average 90° in July; winter nights fall to about 26° in December. A normal year brings about 14 inches of snow; with the rain, that comes to about 11 inches of water.
On November 14 Kahlotus normally reaches 48° and falls to 32°. The record high is 66°, in 1999; the record low −5°, in 1955. The most rain on this date, 0.62 in, fell in 1966.
Normals 1991–2020 and records since 1905 at Hatton 9 SE, 7 miles northwest, 600 ft higher. NOAA, through RCC-ACIS.
