The Calimesa 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. 14, 2021, the hottest reading for this week of the year since 1949. Next is 90° in 1949.
Calimesa’s center stands about 2,400 ft above sea level. Within three miles the land runs from 1,950 ft to 2,940 ft, a difference of 990 ft: steep hill country. The highest named summit within 15 miles is Jepson Peak, about 11,180 ft, 14 miles east-northeast.
Under the town center the state geologic map shows Older Quaternary alluvium and marine deposits (coarse-detrital), from the Pleistocene, less than 2.6 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 2×. 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, less than 2.6 million years old. About 6 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Gneiss. Age: Paleoproterozoic to Miocene, 5.3 to 2,500 million years old. About 4 mi of the line.
Sandstone, conglomerate. Age: Miocene to Pleistocene, less than 23 million years old. About 4 mi of the line.
Granodiorite. Age: Permian to Tertiary, 2.6 to 260 million years old. About 2 mi of the line.
Orthogneiss. Age: Paleoproterozoic to Miocene, 5.3 to 2,500 million years old. About 0.5 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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.
A raindrop that lands in Calimesa reaches the Pacific Ocean by way of the Santa Ana: about 75 river miles.
60 miles of the trip are on the Santa Ana.
Often dry. About 50% 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 Calimesa; river miles along the main stem, rounded.
Calimesa has a cold semi-arid climate. Summer afternoons average 95° in August; winter nights fall to about 37° in December. About 11 inches of rain fall in a normal year.
On November 14 Calimesa normally reaches 73° and falls to 41°. The record high is 91°, in 2021; the record low 30°, in 1964. The most rain on this date, 0.62 in, fell in 1953.
Normals 1991–2020 and records since 1949 at March Afb, 13 miles west-southwest, 860 ft lower. NOAA, through RCC-ACIS.
