The Proberta 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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87° on Nov. 14, 1995, the hottest reading for this week of the year since 1933. Next is 86° in 2019.
Proberta’s center stands about 250 ft above sea level. Within three miles the land runs from 210 ft to 300 ft, a difference of 90 ft: gently rolling country. The highest named summit within 15 miles is Dewitt Peak, about 2,050 ft, 13 miles east-northeast.
Under the town center the state geologic map shows Quaternary alluvium and marine deposits (coarse-detrital), from the Pleistocene to Holocene, 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 14×. 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, conglomerate. Age: Miocene to Pleistocene, less than 23 million years old. About 10 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 9 mi of the line.
Andesite. Age: Late Oligocene to Pleistocene, 2 to 24 million years old. About 5 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 Proberta reaches San Francisco Bay and the Pacific Ocean by way of the Sacramento: about 230 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Proberta; river miles along the main stem, rounded.
Proberta has a hot-summer Mediterranean climate. Summer afternoons average 98° in July; winter nights fall to about 38° in January. About 23 inches of rain fall in a normal year.
On November 14 Proberta normally reaches 65° and falls to 43°. The record high is 87°, in 1995; the record low 25°, in 1985. The most rain on this date, 1.39 in, fell in 1954.
Normals 1991–2020 and records since 1933 at Red Bluff Municipal Airport, 7 miles northwest, 100 ft higher. NOAA, through RCC-ACIS.
