Doesn't the cold also suppress your immune system, since you're using up calories to warm your body?
[1] it may have been specifically about cold and flu, I don't remember exactly. It was within the past month or two in case you feel like searching...
For a long time that was considered to be the only reason colds happen more in cold weather. This thing with influenza viability would change that (of course, what one study finds another refutes, so who really knows).
Bacteria have temperatures at which they grow most effectively, which is why we try to keep food cold. Note that the food in your fridge still goes bad, and it would be pretty damn uncomfortable living at fridge temperature for humans. Bacteria are way more resilient than we are, though it varies by species.
Generally the answer is no.
This is basically the biology version of 'vim is better than emacs'. :P
Viruses can be extremely resilient or extremely fragile, depending on a number of factors including whether or not they're enveloped, whether or not they're currently protected in an aerosolized droplet, etc.