🚀 go-pugleaf

What's typical for weather on I-5 over the {Christmas|Solstice} holidays
between Seattle and, say, Sacramento?  I'm only interested in weather that
affects driving.

Are there places that tend to get shut down by snow?  If so, how long do
they stay shut down?  Are there particular times that tend to be bad?
I know that there are places set up with signs to warn when chains are
required, so I assume that at least sometimes they are needed, but how
often does this happen?  Is there anything else I should know before I
try this (I've only driven this in the spring or summer before -- never
winter)?

--Tim Smith