The Milpitas 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. 17, 1932, the hottest reading for this week of the year since 1893. Next is 83° in 2008.
Milpitas’s center stands about 20 ft above sea level. Within three miles the land runs from 0 ft to 680 ft, a difference of 680 ft: hilly country. The highest named summit within 15 miles is Black Mountain, about 3,910 ft, 11 miles east.
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 7 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.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Siltstone-mudstone. Age: Early Cretaceous to Late Cretaceous, 66 to 145 million years old. About 3 mi of the line.
Sandstone, mudstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 3 mi of the line.
Coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Sandstone, mudstone. Age: Oligocene to Pliocene, 2.6 to 34 million years old. About 1 mi of the line.
Melange. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 0.9 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit along the line are not listed.
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 Milpitas reaches San Francisco Bay and the Pacific Ocean by way of Calera Creek and Coyote Creek: about 6 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Milpitas; river miles along the main stem, rounded.
Milpitas has a warm-summer Mediterranean climate. Summer afternoons average 82° in August; winter nights fall to about 42° in January. About 14 inches of rain fall in a normal year.
On November 14 Milpitas normally reaches 66° and falls to 46°. The record high is 83°, in 2008; the record low 27°, in 1916. The most rain on this date, 1.23 in, fell in 1972.
Normals 1991–2020 and records since 1893 from the San Jose Area threaded record (San Jose, 5 miles south-southwest). NOAA, through RCC-ACIS.
