Spring Valley Spring Valley is the county's largest unincorporated community, yet offers a “small town flavor” to each of its residents. The climate in Spring Valley is an attraction in itself, with temperatures influenced by mild ocean currents and an abundance of sunshine. Summer temperatures average 89 degrees F, with winter temperatures averaging a comfortable 61 degrees F. Spring Valley is 481 feet above sea level and enjoys a smog free climate that offers a yearlong growing season. This temperate climate allows area producers to harvest citrus crops and other types of produce. Lifestyles range from apartment or town home residents to the urban professional, and on to those with larger properties for enjoying horses, livestock and rural community life. Spring Valley holds the golden promise of becoming one of the most attractive residential areas in the country. It's miles of rolling hills, moderate climate and nearness to the Pacific Ocean, mountains, deserts and countryside, make it an ideal southern Californian community.