Rudie sneezes every day in the morning when he's been out. It's no cold, just related to the cold weather. Every now and then he has a runny nose too, but not severe.
I don't give my furry babies antibiotics but try to get things under control with herbal treatment. We have a homeopatic vet who encourages this as well.

A healthy cat should be able to adjust himself to any kind of weather. At days when my cats don't feel themselves, they simply stay at home on one of the heaters.