▁in ▁July ▁and ▁August , ▁there ▁are ▁only ▁three ▁or ▁four ▁days ▁where ▁the ▁high ▁does ▁not ▁reach ▁. ▁Sum mers ▁provide ▁considerable ▁sun sh ine , ▁with ▁July ▁exceed ing ▁ 9 6 ▁percent ▁of ▁the ▁total ▁possible ▁sun light ▁hours ; ▁convers ely , ▁December ▁is ▁the ▁lowest ▁with ▁only ▁ 4 2 ▁percent ▁of ▁the ▁day light ▁time ▁in ▁sun light ▁because ▁of ▁t ule ▁fog . ▁However , ▁the ▁year ▁aver ages ▁ 8 1 % ▁of ▁possible ▁sun sh ine , ▁for ▁a ▁total ▁of ▁ 3 5 5 0 ▁hours . ▁A verage ▁annual ▁precip itation ▁is ▁around ▁, ▁which , ▁by ▁definition , ▁would ▁class ify ▁the ▁area ▁as ▁a ▁sem ides ert . ▁Most ▁of ▁the ▁wind ▁rose ▁direction ▁occurr ences ▁derive ▁from ▁the ▁north west , ▁as ▁wind s ▁are ▁driven ▁down ward ▁along ▁the ▁axis ▁of ▁the ▁California ▁Central ▁Valley ; ▁in ▁December , ▁January ▁and ▁February ▁there ▁is ▁an ▁increased ▁presence ▁of ▁sout he astern ▁wind ▁directions ▁in ▁the ▁wind ▁rose ▁statistics . ▁F res no ▁meteor ology ▁was ▁selected ▁in ▁a ▁national ▁U . S . ▁Environment al ▁Prote ction ▁Agency ▁study ▁for ▁analysis ▁of ▁equilibrium ▁temperature ▁for ▁use ▁of ▁ten - year ▁meteor ological ▁data ▁to ▁represent ▁a ▁warm , ▁dry ▁western ▁United ▁States ▁locale . ▁ ▁The ▁official ▁record ▁high ▁temperature ▁for ▁F res no ▁is ▁, ▁set ▁on ▁July ▁ 8 , ▁ 1 9 0 5 , ▁while ▁the ▁official ▁record ▁low ▁is ▁, ▁set ▁on ▁January