The Jacumba 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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91° on Nov. 11, 2025, the hottest reading for this week of the year since 1948. Next is 90° in 1999.
Jacumba’s center stands about 3,150 ft above sea level. Within three miles the land runs from 2,620 ft to 3,620 ft, a difference of 1,000 ft: steep hill country. The highest named summit within 15 miles is Mount Tule, about 4,610 ft, 5 miles north-northwest.
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 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Tonalite. Age: Middle Jurassic to Late Cretaceous, 66 to 175 million years old. About 6 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 4 mi of the line.
Andesite, basalt. Age: Early Miocene to Middle Miocene, 12 to 19 million years old. About 1 mi of the line.
Coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
Sandstone, conglomerate. Age: Late Cretaceous to Miocene, 5.3 to 100 million years old. About 1 mi of the line.
Andesite. Age: Early Miocene to Middle Miocene, 14 to 18 million years old. About 0.8 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 Jacumba reaches Salton Sea by way of Carrizo Wash and San Felipe Creek: about 60 river miles. Salton Sea has no outlet to the sea: the water leaves only by evaporating or soaking into the ground.
Often dry. About 70% of the way is mapped as streams that run only after rain or snowmelt; the water makes the whole trip in floods.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Jacumba; river miles along the main stem, rounded.
Jacumba has a hot-summer Mediterranean climate. Summer afternoons average 95° in August; winter nights fall to about 33° in December. About 16 inches of rain fall in a normal year.
On November 14 Jacumba normally reaches 72° and falls to 37°. The record high is 85°, in 2016; the record low 21°, in 2000. The most rain on this date, 0.47 in, fell in 1952.
Normals 1991–2020 and records since 1948 at Campo, 16 miles west, 520 ft lower. NOAA, through RCC-ACIS.
