In the winter, many places get cold. While indoor cats may not notice, cats that live outdoors or go outside regularly may need extra protection to stay warm and healthy.
Even though you cat has fur, it can still catch cold from the drastic temperature changes outside compared to inside. If your cat does get a runny nose or acts ill, then take it to a vet as soon as possible.
With a little preparation, you can make sure your cat can stay warm and healthy no matter how cold the winter may be.