It's 4 or 6 inches of snow that stops me - I can't remember exactly how deep it was, 8 years ago. Any snow covering rutted ice, and water reaching my bottom bracket are show-stoppers.

I've commuted in the record cold and record heat for this area so my temperature range is effectively unlimited unless I move out of the Atlanta area. Nothing special for the heat except fingerless gloves and a cap, covering two places that I hate getting sunburned.

The cold - took some learning. Keeping my hands and feet warm were the most difficult and critical.