With thousands upon thousands of international visitors in town this weekend for the F1 races, now is a good time to brush up on the math we use to convert temperatures from Fahrenheit to Celsius, and vice-versa.

If you need to perform a quick conversion, remember the ‘rule of 40′…

Fahrenheit to Celsius:  (___ degrees F) + (40) x (5/9) – (40) = ___ degrees C

Celsius to Fahrenheit:  (___ degrees C) + (40) x (9/5) – (40) = ___ degrees F

And for those of you headed out to the race, the latest forecast is looking just about perfect!

The latest F1 race forecast from the KXAN First Warning Weather Team