▁the ▁weather ▁pattern ▁in ▁the ▁winter ▁season , ▁mixed ▁in ▁with ▁the ▁occas ional ▁rain ▁producing ▁weather ▁system . ▁ ▁Spring ▁and ▁Aut umn ▁Spring ▁and ▁aut umn ▁hardly ▁exist ▁as ▁such ▁in ▁this ▁climate . ▁Summer ▁temperature ▁patterns ▁of ▁ ▁high s ▁and ▁ ▁l ows ▁usually ▁persist ▁until ▁early ▁November . ▁Like wise , ▁the ▁" w inter - season " ▁temperature ▁pattern ▁of ▁ ▁high s ▁and ▁ ▁l ows ▁may ▁last ▁through ▁April ▁or ▁May , ▁period ically ▁interrupted ▁by ▁hot ▁Santa ▁Ana ▁wind ▁events ▁for ▁up ▁to ▁a ▁week ▁at ▁a ▁time . ▁The ▁ra iny ▁season ▁always ▁ends ▁by ▁mid - May . ▁June ▁is ▁normally ▁a ▁trans itional ▁month ▁of ▁less - vol atile ▁temper atures ▁between ▁, ▁with ▁increased ▁cloud y ▁days ▁and ▁the ▁disapp earance ▁of ▁the ▁Santa ▁Ana ▁wind s . ▁ ▁Rain fall ▁ ▁Most ▁rain ▁occurs ▁during ▁the ▁winter ▁and ▁ ▁early ▁to ▁mid ▁spring , ▁typical ▁of ▁a ▁Mediter rane an ▁climate . ▁However , ▁the ▁amount ▁received ▁is ▁usually ▁lower ▁than ▁in ▁other ▁Mediter rane an ▁clim ates . ▁The ▁first ▁sp or adic ▁ra inf all ▁of ▁the ▁ra iny ▁season ▁usually ▁occurs ▁in ▁October ▁or ▁November , ▁with ▁heavy ▁rain ▁becoming ▁more ▁common ▁December ▁through ▁early ▁April . ▁Usually ▁the ▁P ine apple ▁Express ▁storm s ▁from ▁November ▁to ▁January . ▁February , ▁on ▁average , ▁is ▁the ▁wet test ▁month . ▁The ▁ra ins ▁then ▁t aper ▁off ▁in ▁April ▁or ▁by ▁May , ▁usually ▁see