The Del Mar 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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92° on Nov. 15, 2008, the hottest reading for this week of the year since 1947. Next is 92° in 2016.
Del Mar’s center stands about 230 ft above sea level. Within three miles the land runs from 0 ft to 390 ft, a difference of 390 ft: rolling country. Open water lies within three miles. The highest named summit within 15 miles is Mount Whitney, about 1,690 ft, 12 miles north-northeast.
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 16×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Felsic-volcanic, mafic-volcanic. Age: Late Jurassic to Early Cretaceous, 100 to 164 million years old. About 6 mi of the line.
Mudstone, sandstone. Age: Paleocene to Oligocene, 23 to 66 million years old. About 3 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Siltstone-mudstone. Age: Early Cretaceous to Late Cretaceous, 66 to 145 million years old. About 2 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.
Rain that falls on Del Mar runs straight into the Pacific Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Del Mar; river miles along the main stem, rounded.
Del Mar has a cold semi-arid climate. Summer afternoons average 82° in August; winter nights fall to about 46° in December. About 12 inches of rain fall in a normal year.
On November 14 Del Mar normally reaches 73° and falls to 51°. The record high is 92°, in 2016; the record low 40°, in 1985. The most rain on this date, 0.54 in, fell in 1965.
Normals 1991–2020 and records since 1947 at San Diego Miramar Nas, 10 miles southeast, 250 ft higher. NOAA, through RCC-ACIS.
