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 of rain per year. Years of average rainfall are rare; the usual pattern is bimodal, with a short string of dry years followed by one or two wet years that make up the average. I think that the IDW rain normal was the best illustration of LA precipitation because it enabled the difference of color to differentiate area of higher precipitation
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