The average annual temperature in downtown is 66 °F (19 °C): 75 °F (24 °C) during the day and 57 °F (14 °C) at night. In the coldest month, January, the temperature typically ranges from 59 to 73 °F (15 to 23 °C) during the day and 45 to 55 °F (7 to 13 °C) at night. In the warmest month – August – the temperature typically ranges from 79 to 90 °F (26 to 32 °C) during the day and around 64 °F (18 °C) at night. Temperatures exceed 90 °F (32 °C) on a dozen or so days in the year, from one day a month in April, May, June and November to three days a month in July, August, October and to five days in September. Temperatures are subject to substantial daily swings; in inland areas the difference between the average daily low and the average daily high is over 30 °F (17 °C).[48] Average annual temperature of sea is 63 °F (17 °C), from 58 °F (14 °C) in January to 68 °F (20 °C) in August. Sunshine hours is above 3,000 per year, from average 7 hours of sunshine / day in December to average 12 hours of sunshine / day in July.
The Los Angeles area is also subject to phenomena typical of a microclimate. As such, the temperatures can vary as much as 36 °F (20 °C) between inland areas and the coast. California also has a weather phenomenon called "June Gloom or May Grey", which sometimes gives overcast or foggy skies in the morning at the coast, but usually gives sunny skies by noon, during late spring and early summer.
Downtown Los Angeles averages 15.14 inches (384.6 mm) of precipitation annually, which mainly occurs during the winter and spring (November through April) with generally moderate rain showers, but usually as heavy rainfall and thunderstorms during Winter storms. The coast gets slightly less rainfall, while the mountains get slightly more. However the San Fernando Valley Region of Los Angeles can get between 16 and 20 inches (410 and 510 mm) of rain per year. Years of average rainfall are rare; the usual pattern is bimodal, with a short string of dry years (perhaps 7–8 inches/180–200 millimetres) followed by one or two wet years that make up the average. Snowfall is extremely rare in the city basin, but the mountains within city limits typically receive snowfall every winter. The greatest snowfall recorded in downtown Los Angeles was 2 inches (5 cm) in 1932. The highest recorded temperature in downtown Los Angeles is 113 °F (45 °C) on September 27, 2010[53] and the lowest recorded temperature is 24 °F (−4 °C) on December 22, 1944.
Flora
MacArthur Park
The Los Angeles area is rich in native plant species due in part to a diversity in habitats, including beaches, wetlands, and mountains. The most prevalent botanical environment is coastal sage scrub, which covers the hillsides in combustible chaparral. Native plants include: California poppy, matilija poppy, toyon, Coast Live Oak, and Giant Wildrye. Many of these native species, such as the Los Angeles sunflower, have become so rare as to be considered endangered. Though it is not native to the area, the official tree of Los Angeles is the Coral Tree and the official flower of Los Angeles is the Bird of Paradise (Strelitzia reginae). Mexican Fan Palms, California Fan Palms, and Canary Island Palms can be seen throughout the Los Angeles area, despite the latter being non-indigenous to Southern California.
Environmental issues
The name given by the Chumash tribe of Native Americans for the area now known as Los Angeles translates to "the valley of smoke"because of the smog from native campfires. Owing to geography, heavy reliance on automobiles, and the Los Angeles/Long Beach port complex, Los Angeles suffers from air pollution in the form of smog. The Los Angeles Basin and the San Fernando Valley are susceptible to atmospheric inversion, which holds in the exhausts from road vehicles, airplanes, locomotives, shipping, manufacturing, and other sources. The smog season lasts from May to October. Unlike other large cities that rely on rain to clear smog, Los Angeles gets only 15 inches (380 mm) of rain each year: pollution accumulates over many consecutive days. Issues of air quality in Los Angeles and other major cities led to the passage of early national environmental legislation, including the Clean Air Act. More recently, the state of California has led the nation in working to limit pollution by mandating low-emission vehicles. Smog is expected to continue to drop in the coming years due to aggressive steps to reduce it, electric and hybrid cars, improvements in mass transit, and other pollution reducing measures.
The number of Stage 1 smog alerts in Los Angeles has declined from over 100 per year in the 1970s to almost zero in the new millennium. Despite improvement, the 2006 and 2007 annual reports of the American Lung Association ranked the city as the most polluted in the country with short-term particle pollution and year-round particle pollution. In 2008, the city was ranked the second most polluted and again had the highest year-round particulate pollution. In addition, the groundwater is increasingly threatened by MTBE from gas stations and perchlorate from rocket fuel. With pollution still a significant problem, the city continues to take aggressive steps to improve air and water conditions. The city met its goal of providing 20 percent of the city's power from renewable sources in 2010.
All about Los Angeles:
- History of Los Angeles 3
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- History of Los Angeles 1
- History of Los Angeles
- Geography of Los Angeles
- Media in Los Angeles
- Economy of Los Angeles
- Religion in Los Angeles
- Sports in Los Angeles
- Demographics of Los Angeles
- Education in Los Angeles
- Transportation in Los Angeles
- Government of Los Angeles
- Crime in Los Angeles
- Culture of Los Angeles
- Los Angeles County, California
- Beverly Hills
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