Late Seventies, had to be -- I was living there.
I do *not* consider myself a skilled snow&ice driver, but can muddle along if the challenges don't get too great. An icy I-380 is a wonder whose details I have, mercifully, let the backup storage media deteriorate on.
Or did that wander in from another dimension? I have this distinct vision of the hills above SLAC with a coating of white stuff, and one of the hyper-pretentious houses built in vaguely Tyrolean style looking properly placed for the first and probably only time in its existence.