90 degress youre probably talking about farenheit, its impossible to be alive if its 90 celcius (thats extremly hot)
You should learn that were not using the same system in the rest of the world (you know were talking about how tall people are in Cms, not in inches/feet.. as an example)
It's weird I don't think anyone uses just Imperial or metric it seems we still live in a world of mixed standards. I tell the tempreture in centegrade, my height in feet and inches but I would measure a room centimetres. I'm waiting for the decimal clock... 10 hour days now that would be odd!