The Mesa 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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77° on Nov. 13, 1999, the hottest reading for this week of the year since 1894. Next is 73° in 1896.
Mesa’s center stands about 740 ft above sea level. Within three miles the land runs from 670 ft to 970 ft, a difference of 300 ft: rolling country. The highest named summit within 15 miles is Jackass Mountain, about 910 ft, 11 miles south-southwest.
Under the town center the state geologic map shows Younger glacial drift (fine-detrital, coarse-detrital), from the Pleistocene, less than 2.6 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 28×. 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 8 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 7 mi of the line.
Basalt. Age: Late Oligocene to Early Pliocene, 3.6 to 28 million years old. About 5 mi of the line.
Sandstone, clay, volcanic. Age: Pleistocene, less than 2.6 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.
Mesa has a cold semi-arid climate. Summer afternoons average 92° in July; winter nights fall to about 27° in December. About 8 inches of rain fall in a normal year.
On November 14 Mesa normally reaches 50° and falls to 32°. The record high is 71°, in 2021; the record low 6°, in 1955. The most rain on this date, 0.53 in, fell in 1966.
Normals 1991–2020 and records since 1894 from the Tri-Cities Area threaded record (Pasco Tri Cities Airport, 22 miles south-southwest, 340 ft lower). NOAA, through RCC-ACIS.
