That is cold to us. What is the norm in NY in the winter? 20's? Well take thirty degrees off of that and BRRRRRRRRRR you would say it's really cold, yes?
There are people in the other parts of the US that probably think you are sulking little babies for complaining about it being in the 10's or 29's.
When you are in a certain enviornment for a period of time that is what your body comes to expect, anything different is a shock to the system.