The last snowfall recorded at Los Angeles International Airport was in January 1962, according to the National Weather Service.
Okay, actually just as (contrary to media treatments) a spell of hot weather doesn't prove global warming, cold weather doesn't disprove it. But I think that the real cause of this cold snap in the L.A./Hollywood area is that Al Gore has been shortlisted for an Oscar. Al just can't catch a break.
The well documented phenomenon that leads to very low, unseasonal temperatures, driving rain, hail, snow or all of the above whenever Al Gore visits an area to discuss global "warming". Hence the "Gore Effect."