<P> The winter wet season normally runs from November through early May . Precipitation episodes in Los Angeles , with a few notable exceptions , are largely caused by extratropical disturbances approaching California from the west or northwest during the winter season . The normal seasonal rainfall measured at downtown Los Angeles is 14.77 inches , of which 92 % falls between November 1st and April 30th . While there is a great increase in rainfall in the winter months , the winter months in the Los Angeles are still frequently sunny and pleasant with mild temperatures . The average highs range from the upper 60 's F to 70 F ( 17 - 21 C ) with cooler overnight lows in the upper 40 's and lower 50 's F ( 8 - 12 C ) . </P>
<P> The winter wet season normally runs from November through early May . Precipitation episodes in Los Angeles , with a few notable exceptions , are largely caused by extratropical disturbances approaching California from the west or northwest during the winter season . The normal seasonal rainfall measured at downtown Los Angeles is 14.77 inches , of which 92 % falls between November 1st and April 30th . While there is a great increase in rainfall in the winter months , the winter months in the Los Angeles are still frequently sunny and pleasant with mild temperatures . The average highs range from the upper 60 's F to 70 F ( 17 - 21 C ) with cooler overnight lows in the upper 40 's and lower 50 's F ( 8 - 12 C ) . </P>
6 . the primary cause of wet winters in southern california is
6 . the primary cause of wet winters in southern california is
extratropical disturbances approaching California from the west or northwest during the winter season
extratropical disturbances approaching California from the west or northwest during the winter season