[°F] = [°C] × 9/5 + 32
If the actual formula to convert the temperature from Fahrenheit to Celsius degrees is too tough for you to remember, it turns out you can use a section of Manhattan 6 Train subway stops to help you convert on the fly.
To convert Fahrenheit to Celsius, know that -10C is 14F, and then follow the NYC MTA 6 stops uptown.
It’s not 100% accurate, but it’s close enough to be a valid approximation if you are in a pinch. Pretty sweet.