"AMEN to that! I know I am HOT when its 95 degrees out, 22C means nothing to my body!"
0 is freezing. 10 is cool. 20 is room temperature. 30 is rather warm. 40 is stinking hot. What's so complicated about that? OK, I admit it has taken me a while to get used to it, too, but mostly because where I lived most of my life temperatures about 25 or so were only ever seen in a sauna.
I was in Saudi recently. We had some Norweigian engineers with us. Never been to the desert before and were worried about the temp.
We were talking about the weather --- going to be 110 (F, of course) outside.
They were in a complete state of panic until they figured out we were talking F. Then they still freaked because it was too hot for them.