Oh right now that is different. What protection do you have on the car currently? That can make a significance difference to how dirt bonds onto paintwork.
I have a layer of Maguires quick wax on it, but it wasn't applied very well as it was about to rain and the car was slightly wet.
On snow... I did have a play in the snow this winter, just a little bit on the residential streets, more slush. The 2017 Track mode is amazing for that. It lets you away with so much more and only intervenes if you are about to bin it. Although it does seem to try and help you stay off the limiter in 1st when hooning. It doesn't BANG in like the 2012 unless it has to, but more comes in gradually.