Just goes to show that it's not easy to match location to measurement standard: you would be wrong if you picked Imperial measurements for the UK, unless the person viewing the page is of a certain mindset and born before about 1975.

I was raised in the UK, and used celsius. Now I live in the US and have learned to use Fahrenheit.

On a related note, I was very annoyed that Yahoo Weather will allow you to either choose centigrade and kilometers per hour, or Fahrenheit and MPH, but not to mix and match. Insane.