No one calls out decimals in Celsius. Unless you are measuring your kids fever. 38.1 vs 38.5 vs 38.9 you know that it’s time to ready the metamizole if it keeps creeping up like that

0°C is the frost point of water. If you know it will dip below that during the night, you can prepare your plants, driveway, kids (I’m sorry my love summer is over), pets, clothes, etc the day prior.

-40° is -40° though, doesn’t matter if it’s F or C. The best part of both scales.