The Oceanside 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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5.63 inches of rain fell in two days, the most for this week of the year since records began in 1940. The next wettest, 5.09 inches, fell in 2021.
Oceanside’s center stands about 160 ft above sea level. Within three miles the land runs from 0 ft to 1,210 ft, a difference of 1,210 ft: steep hill country. Open water lies within three miles. The highest named summit within 15 miles is Edwards Butte, about 3,130 ft, 15 miles east-southeast.
The section below crosses 6 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.
Basalt. Age: Middle Eocene to Late Eocene, 34 to 48 million years old. About 3 mi of the line.
Sand, gravel, silt. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Basalt. Age: Miocene, 5.3 to 23 million years old. About 2 mi of the line.
Shale, siltstone. Age: Late Eocene to Oligocene, 23 to 38 million years old. About 1 mi of the line.
Siltstone, sandstone. Age: Early Miocene to Middle Miocene, 12 to 23 million years old. About 1 mi of the line.
Basalt. Age: Middle Eocene to Late Eocene, 34 to 48 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.
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 Oceanside runs straight into the Pacific Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Oceanside; river miles along the main stem, rounded.
Oceanside has a warm-summer Mediterranean climate. Summer afternoons average 70° in August; winter nights fall to about 39° in December. About 80 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Oceanside normally reaches 56° and falls to 42°. The record high is 69°, in 1995; the record low 26°, in 1959. The most rain on this date, 2.63 in, fell in 1942.
Normals 1991–2020 and records since 1940 at Cloverdale, 18 miles south-southeast, 150 ft lower. NOAA, through RCC-ACIS.
