The Knightsen 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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84° on Nov. 14, 1995, the hottest reading for this week of the year since 1955. Next is 79° in 1990.
Knightsen’s center stands about 30 ft above sea level. Within three miles the land runs from -10 ft to 90 ft, a difference of 100 ft: gently rolling country. The highest named summit within 15 miles is Mount Diablo, about 3,810 ft, 15 miles west-southwest.
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 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 10×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 14 mi of the line.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 6 mi of the line.
Mudstone, sandstone. Age: Paleocene to Oligocene, 23 to 66 million years old. About 1 mi of the line.
Sand. Age: Quaternary, less than 2.6 million years old. About 0.6 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.
A raindrop that lands in Knightsen reaches San Francisco Bay and the Pacific Ocean by way of the San Joaquin and New York Slough: about 17 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Knightsen; river miles along the main stem, rounded.
Knightsen has a cold semi-arid climate. Summer afternoons average 93° in July; winter nights fall to about 40° in December. About 12 inches of rain fall in a normal year.
On November 14 Knightsen normally reaches 66° and falls to 46°. The record high is 84°, in 1995; the record low 32°, in 1961. The most rain on this date, 0.60 in, fell in 1972.
Normals 1991–2020 and records since 1955 at Tracy Pumping Plant, 13 miles south-southeast. NOAA, through RCC-ACIS.
