The Boonville 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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88° on Nov. 17, 1932, the hottest reading for this week of the year since 1893. Next is 85° in 1930.
Boonville’s center stands about 370 ft above sea level. Within three miles the land runs from 290 ft to 1,820 ft, a difference of 1,530 ft: steep hill country. The highest named summit within 15 miles is Sanel Mountain, about 3,340 ft, 9 miles east-southeast.
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 7×. 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, mudstone. Age: Late Cretaceous to Pliocene, 2.6 to 100 million years old. About 22 mi of the line.
Coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.4 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.
A raindrop that lands in Boonville reaches the Pacific Ocean by way of Robinson Creek, Anderson Creek and the Navarro: about 35 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Boonville; river miles along the main stem, rounded.
Boonville has a hot-summer Mediterranean climate. Summer afternoons average 94° in July; winter nights fall to about 36° in December. About 35 inches of rain fall in a normal year.
On November 14 Boonville normally reaches 65° and falls to 40°. The record high is 79°, in 2008; the record low 20°, in 1916. The most rain on this date, 1.91 in, fell in 1903.
Normals 1991–2020 and records since 1893 from the Ukiah Area threaded record (Ukiah Municipal Airport, 12 miles northeast, 230 ft higher). NOAA, through RCC-ACIS.
