Yep I do. It depends where you are. I'm based in London so I don't have to contend with snow too much. Also London's roads, or at least the ones I use, tend to be gritted fairly well. If snow does arrive I do have an MTB ready but to be honest, last year it wouldn't have done me much good. All the days I couldn't cycle to work, I couldn't get to work in any other way either.
For wind, rain etc just dress appropriately. Make sure you're wearing whatever you need to make YOU feel comfortable (what I wear may not work for you). Also if it's wet and dark or foggy, make sure you've got good lights. If in doubt about road surface etc, take it easy. It's not a race