Winter is San Diego is definitely not most peoples' idea of winter. However, with the rains (heavy and light) my '01 daily driver does just fine.
My only issue was with tires. When I have Kumho Ecsta ASX on, they grip well on wet or dry. When I have Hankook Ventus V12 Evo K110 on, the rear end likes to let go a bit quicker on hard cornering. They LOVE the dry pavement and stick like glue.
My car doesn't know what snow is and likely never will.