YUROP

That's the whole point of using Celsius or Fahrenheit. They are both just different representations of Kelvin. But Kelvin is absolute.

If you want your weather scale to go -20 to 40 or 0 to 100. Is debatable.

0°F to 100°F is better for weather

0°C to 100°C is better for water temperature

If you know C, there's no need to learn F for the weather.

If you know F, there's no reason to learn C for the weather.

You don't need to know F or C to read a thermometer. 375°F or 190°C are just numbers you might bake cookies at. No one knows how 375°F or 190°C "feels like"

Things you need to know is if 90°F or 32°C water is safe to get in. Over 100°F is getting dangerous, Over 40°C is getting dangerous.

Normal house hot water is 50°C or 120°F.

Time to cause burns:

120°F or 50°C More than 5 minutes

130°F or 55°C About 30 seconds

140°F or 60°C Less than 5 seconds

150°F or 65°C About 1.5 seconds

160°F or 70°C About 1/2 a second

Aslong as you know a system, you're fine. Fahrenheit isn't like the other US customary units. It is based on the exact same thing Celsius is, Kelvin. Just shown in different numbers. Something like a quart to gallon is a completely made-up measurement and horrible.