The Broadmoor 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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29° on Nov. 12, 2019, the coldest reading for this week of the year since 1948. Next is 34° in 1964.
Broadmoor’s center stands about 180 ft above sea level. Within three miles the land runs from 10 ft to 1,040 ft, a difference of 1,030 ft: steep hill country. Open water lies within three miles. The highest named summit within 15 miles is Scarpet Peak, about 1,940 ft, 12 miles south-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 6 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.
Sandstone, mudstone. Age: Miocene to Pleistocene, less than 23 million years old. About 4 mi of the line.
Greenstone. Age: Jurassic to Cretaceous, 66 to 202 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.
Melange. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 2 mi of the line.
Sandstone, mudstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 1 mi of the line.
Sand. Age: Quaternary, less than 2.6 million years old. About 1 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 Broadmoor runs straight into the Pacific Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Broadmoor; river miles along the main stem, rounded.
Broadmoor has a warm-summer Mediterranean climate. Summer afternoons average 66° in October; winter nights fall to about 46° in January. About 21 inches of rain fall in a normal year.
On November 14 Broadmoor normally reaches 64° and falls to 50°. The record high is 80°, in 2008; the record low 36°, in 1978. The most rain on this date, 0.87 in, fell in 1968.
Normals 1991–2020 and records since 1948 at San Francisco Oceanside, 3 miles north-northwest, 170 ft lower. NOAA, through RCC-ACIS.
