Andre - your comment reminds me of our experience when we arrived in Capetown after a long flight from Canada many years ago. It was in December, so summer down your way. We were taking a taxi from the airport to our hotel and were chatting with our taxi driver.
Taxi driver - "What is the weather like back where you live?"
Us - "It was -20° C when we left."
Taxi driver - "It gets down to 20° C here too."
The taxi driver simply couldn't fathom temperatures with a minus sign in front of them...