Cats are intolerant to heat but not cold. Generally, cats will feel cold when the temperature is below 10 degrees. Cats will stop playing when they feel cold and will curl up when resting. It is recommended that breeders keep their cats warm during the winter when the seasons change. They can put clothes on their pets, lay thick mats in the nest, or let the cats get more sun exposure when there is sunshine at noon to prevent the cats from feeling cold. Cold and fever caused by cold.