Snow? What's snow? I think I saw that on TV once
FWIW, I've found that the stock tires work excellently in wet conditions. As with any car, you're in trouble if you try to skim any deeper water at speed in normal tires - but for solidly "wet" pavement in light to normal rain, the car stuck to the road like glue (unlike my last car, where highway + rain meant I was the slowest guy on the road out of fear of a sudden loss of grip).