I've switched to Celcius as an American since weather is mostly conveyed to me through the phone now-a-days. I've been using it for 2 years now and I am pretty

I've switched to Celcius as an American since weather is mostly conveyed to me through the phone now-a-days. I've been using it for 2 years now and I am pretty well calibrated to California temperatures: 14C or lower, wear a jacket, 15-25C slightly chilly to pleasant, 25-35C is warm and hot. It indeed is just about getting used to it. Precision of Farenheit actually gets in the way, usually we don't really care if it is 41F or 42F. It's the same. Wear a jacket. I still can't get used to cm for measurement of everyday objects. Inches are just so easy for me. In terms of weight/volume, I use ml/liters for fluids and g/kg for weight everywhere I can.