The Tracy 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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28° on Nov. 15, 1978, the coldest reading for this week of the year since 1906. Next is 28° in 2022.
Tracy’s center stands about 60 ft above sea level. Within three miles the land runs from 0 ft to 140 ft, a difference of 140 ft: gently rolling country. The highest named summit within 15 miles is Eagle Mountain, about 3,010 ft, 13 miles south-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 8×. 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 19 mi of the line.
Sandstone, conglomerate. Age: Miocene to Pleistocene, less than 23 million years old. About 3 mi of the line.
Melange. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 2 mi of the line.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 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 Tracy reaches San Francisco Bay and the Pacific Ocean by way of the Old, the San Joaquin and New York Slough: about 50 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Tracy; river miles along the main stem, rounded.
Tracy has a hot-summer Mediterranean climate. Summer afternoons average 93° in July; winter nights fall to about 36° in January. About 13 inches of rain fall in a normal year.
On November 14 Tracy normally reaches 68° and falls to 41°. The record high is 80°, in 1995; the record low 29°, in 2022. The most rain on this date, 1.08 in, fell in 1981.
Normals 1991–2020 and records since 1906 at Tracy Carbona, 6 miles southeast. NOAA, through RCC-ACIS.
