My parents are American, so temperatures in the summer were always related in Fahrenheit. Summer temperatures don’t make sense to me in Celsius.
In the winter, though, when you’re listening to Canadian weather every day, you hear the temperature reported in Celsius. So in the winter I only understand temperatures in Celsius, not Fahrenheit. I just had to switch the temperature units on my iGoogle weather gadget because -5F doesn’t mean anything to me. -20C? Oh. That’s cold.