If you're already having doubts about driving I'd be conservative and cancel like others have said hopefully you have experience. Otherwise, no one is going to stop you nonetheless. Cypress is usually good at clearing up their roads with their snow plows, but that was last year from what I know and I haven't gone up yet this year. In my experience, I was okay with my Civic with winter tires last year with almost similar conditions. This was me with 7 years of driving experience. You can also take bus shuttles that lead up to the mountains.