The North Tustin 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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26° on Nov. 12, 1938, the coldest reading for this week of the year since 1906. Next is 30° in 1919.
North Tustin’s center stands about 250 ft above sea level. Within three miles the land runs from 90 ft to 1,020 ft, a difference of 930 ft: steep hill country. The highest named summit within 15 miles is Modjeska Peak, about 5,460 ft, 15 miles east-southeast.
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 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 5×. 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 12 mi of the line.
Sandstone, conglomerate. Age: Middle Eocene to Early Miocene, 16 to 48 million years old. About 4 mi of the line.
Argillite. Age: Paleozoic to Late Jurassic, 145 to 542 million years old. About 3 mi of the line.
Sandstone, mudstone. Age: Oligocene to Pliocene, 2.6 to 34 million years old. About 2 mi of the line.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 1 mi of the line.
Felsic-volcanic, mafic-volcanic. Age: Late Jurassic to Early Cretaceous, 100 to 164 million years old. About 0.7 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 smaller units 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.
North Tustin has a hot semi-arid climate. Summer afternoons average 85° in August; winter nights fall to about 48° in December. About 12 inches of rain fall in a normal year.
On November 14 North Tustin normally reaches 75° and falls to 53°. The record high is 100°, in 1933; the record low 30°, in 1938. The most rain on this date, 1.83 in, fell in 1946.
Normals 1991–2020 and records since 1906 at Santa Ana Fire Station, 4 miles west-southwest, 120 ft lower. NOAA, through RCC-ACIS.
