Memes

I'm also biased.

But:

• Celsius is easy to understand, even for children: water freezes at 0°C, boils at 100°C.
• It is understood by more people in the world.
• If the US used Celsius, understanding scientific papers and data would be easier for common people.
• In Celsius, the range of livable temperatures for humans (-20 to 40°C) still gives plenty of precision. Additionally, each step in the Celsius scale corresponds to a bigger change in "feel" of the temperature, which leads to a more intuitive understanding of temperature changes.