Whats the weather like out there at the moment and through to the beginning of March?

I'm heading our for 4 days in San Fran and then 6 in Tahoe for my first times skiing and I don't have a clue what to pack for the various weather/activities.... any help from some locals would be a great help.

Also some places to check out in SF....sights, bars, clubs, food etc.

Thanks!