I dropped my h: Fahrenheit

Just to help you with those degrees:
0°C = 32°F.
20°F is about -7°C, so 20 to 30°F is light freezing.
Our body temperature of 37°C = 98,6 °F, in fact our body temperature is generally closer to 98°F than to 37°C
The boiling point of water (at 1 atm.) is 212°F = 100°C.
0°F = -18°C (nearly)

Mr Farenheit (of German-Polish-Dutch descent) determined his zero as the freezing point of a brine solution. His scale was developed in the 18th century and has been dabbled with a bit since.
At present only the US and some islands and Liberia use it. The rest of the world uses the scale of Mr Celsius (who was a Swede, btw)

I don’t know what those temps mean! But the ones I heard about Chicago (in Celsius) were colder than I can even imagine.

Take care in the NZ Summer heat…we got our first snow storm of the winter in western Washington. About 8 inches here. Hovering in the 20’s/low 30’s (F) so not nearly as bad as the mid-west’s arctic vortex.