I recently learned that Saimese cats are temperature sensitive. The dark areas on their faces, ears, feet, and tail are due to pigmentation reacting on the cooler areas of their bodies. When Chai first came to us she had a cold, and her face turned visibly lighter for a week or so.
Fast forward to last week. While we were away, we left the porch window open. The cats had access to the screen porch 24/7. Chai apparently enjoys the night air. Compare this current photo. . .
. . .with this one from 7/28 during the heatwave. Pretty cool, huh?