Temperature can affect a cat’s color.
In the 1930s, this was discovered in Siamese cats. This breed has albino genes that do magic when the temperature rises above 96.8°F (36°C). They often have dark areas on their legs, tails, ears, and face (the body’s extremities), while the rest of their fur remains creamy white. This also occurs in Himalayan cats and other Eastern breeds.
I have a black cat, his name is Spot, he's not happy unless my arm is bleeding from several puncture wounds for "loving me so much" in the morning.