Hi Regen! Well, you are right, Argentina is a "vertical" country, so it's not the same what happens in my area that in others. In the South, it is very cold (it reaches latitudes comparable with Canada in the North). But Buenos Aires in the middle of the country, so it is never too cold. When I was a child, it was quite common to have around -5°C in Winter, but lately it rarely reaches below zero. It is not only because of weather global change but also an effect of the city itself, all the asphalt, cars, concrete. But in the suburbia (more or less the same latitude) it often reaches a few degrees below zero.
That about the lake sounds dreamy.