Well, without being Mr. Obvious here, you are dealing with a real wheel drive pony vehicle. A muscle car isn't built for drifting. So with having such little weight in the back weighing the rear wheels down, you are going to lose traction very easily on any surface that isn't a dry, paved road.
I try not to drive my Mustang in the rain for that very reason. I was making a left turn at a traffic light and hydroplaned to the point that it was enough for me.
Bottom line is it's a car meant to be driven on nice, sunny days. But hey, we all get caught in the weather sometimes.
2000 Mustang GT
My pride and joy, my first car ever. Bought on 6/2/2013.
Check it out at my channel here: youtube.com/mustangfanatic95
Expect more vids in the Spring: Car shows, cruises, fly-bys, etc.