ThePomona Valley is located in theGreater Los Angeles Area between theSan Gabriel Valley andSan Bernardino Valley inSouthern California. The valley is approximately 30 miles (48 km) east of downtownLos Angeles.
The earliest inhabitants of Pomona Valley were theGabrielino (Tongva) andSerrano Indians.[1]
On March 1, 1893 theCalifornia Assembly voted 54–14 for a new county to form in the region, to be named San Antonio County, withPomona as its seat. Los Angeles interests in the Senate rejected the concept, however, and today the eastern and western portions of the valley remain divided between San Bernardino and Los Angeles counties (San Antonio Creek).[2]
Thealluvial valley is formed by theSanta Ana River and its tributaries.[3] The Pomona Valley is separated fromSan Gabriel Valley to the west by the northeastern end of theSan Jose Hills, running approximately alongState Route 57. The eastern boundaries are the Jurupa Hills and theCajon Pass, (the eastern end of theSan Gabriel Mountains) running nearInterstate 15, which separates the Pomona Valley from theSan Bernardino Valley. The northern boundary is theSan Gabriel Mountains. TheChino Hills are the southern boundary that separates the Pomona Valley from northern Orange County. HistoricU.S. Route 66 runs east-west across the north side of Pomona Valley. San Antonio Creek runs right through the center of the valley dividing the valley into west and east, and also acts as a section of the border betweenLos Angeles County andSan Bernardino County. It originates from the San Gabriel Mountains watershed aroundMount San Antonio (known locally as Mt. Baldy) and joins the Santa Ana River south of Chino. The Pomona Valley ranges from the city ofSan Dimas from the far west toRancho Cucamonga to the far east portion of the valley.
The Pomona Valley experiences aMediterranean Climate. In contrast to much of theGreater Los Angeles Area, The Pomona Valley can get much hotter summers with high temperatures ranging from the triple digits. Due to its elevation ranging from 800 to 2200 feet, winters in the Pomona Valley can also get cold. Trace amounts of snowfall can occur anywhere above 1500 feet. On the valley floor, average rainfall amounts range anywhere from 12 to 16 inches. Foothill communities can get anywhere from 14 to 18 inches of rain a year. In the fall (fire season),Santa Ana Winds can occur giving strong offshore winds from theCajon Pass.
| Climate data for Pomona Fairplex, California | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 91 (33) | 94 (34) | 100 (38) | 104 (40) | 106 (41) | 117 (47) | 113 (45) | 110 (43) | 113 (45) | 107 (42) | 97 (36) | 93 (34) | 117 (47) |
| Mean daily maximum °F (°C) | 65.5 (18.6) | 67.6 (19.8) | 70.1 (21.2) | 74.2 (23.4) | 77.8 (25.4) | 84.1 (28.9) | 91.0 (32.8) | 91.1 (32.8) | 88.4 (31.3) | 80.6 (27.0) | 73.2 (22.9) | 66.4 (19.1) | 77.5 (25.3) |
| Daily mean °F (°C) | 51.8 (11.0) | 54.0 (12.2) | 56.2 (13.4) | 59.9 (15.5) | 63.9 (17.7) | 68.8 (20.4) | 74.4 (23.6) | 74.6 (23.7) | 71.9 (22.2) | 65.2 (18.4) | 57.9 (14.4) | 52.4 (11.3) | 62.6 (17.0) |
| Mean daily minimum °F (°C) | 38.1 (3.4) | 40.3 (4.6) | 42.3 (5.7) | 45.6 (7.6) | 50.0 (10.0) | 53.4 (11.9) | 57.7 (14.3) | 58.1 (14.5) | 55.3 (12.9) | 49.8 (9.9) | 42.6 (5.9) | 38.4 (3.6) | 47.6 (8.7) |
| Record low °F (°C) | 21 (−6) | 22 (−6) | 26 (−3) | 29 (−2) | 31 (−1) | 38 (3) | 41 (5) | 42 (6) | 38 (3) | 29 (−2) | 24 (−4) | 22 (−6) | 21 (−6) |
| Averageprecipitation inches (mm) | 3.56 (90) | 3.49 (89) | 2.82 (72) | 1.22 (31) | 0.35 (8.9) | 0.10 (2.5) | 0.01 (0.25) | 0.07 (1.8) | 0.26 (6.6) | 0.78 (20) | 1.56 (40) | 2.77 (70) | 16.99 (432.05) |
| Source: Western Regional Climate Center[4] | |||||||||||||
The residents of the Pomona Valley are predominantly Latino andWhite. In contrast to theSan Gabriel Valley, the population ofAsian Americans is much smaller. Northern areas of the valley that contain the cities ofSan Dimas,Claremont,La Verne andUpland have large Caucasian populations. Central portions of the valley that contain the cities ofPomona,Montclair, Chino, andOntario have large Hispanic populations. Southern portions of the Pomona Valley such asChino Hills, andOntario Ranch contain rather large Asian populations. Rancho Cucamonga, a city in the north west of the valley is very diverse, with large groups of Hispanics, Whites, Asians, and Blacks.
The Pomona Valley is served by several freeways:
In Claremont, Mt. Baldy Road leads into theMt. Baldy Ski Lifts ofMount San Antonio in the San Gabriel Mountains.
Sacramento (capital) | |
| Topics | |
| Regions |
|
| Metro regions | |
| Counties |
|
| Most populous cities | |
34°04′34″N117°39′25″W / 34.076°N 117.657°W /34.076; -117.657
