Re: Snow and wet weather performance
RE: 3 Season vs All season tires.
(From my understanding)
All season tires are basically made to be a compromise for all weather extremes. They will give you "acceptable" performance in cold, hot, wet, and snowy conditions. Not optimal in any particular condition though. Rubber compound is probably produced to handle temperature extremes between Winter and Summer. Tread pattern, siping, and shoulder design is designed as a combination of different factors as well. Pirelli most likely designed this tire to suit the Jeep SRT8 for all-around use with performance characteristics built in.
3 season tires are most likely built without concern for cold temperatures ( performance/soft rubber becomes brittle at low temps). They can be used in warmer climates that don't expect cold weather and snow. This tire would be able to be designed for more performance vs the all-season's. The tread pattern, siping, material, and shoulder design can be designed for more traction in warmer conditions. Although not a specific max performance Summer/ track tire, it can possibly get close enough?
Feel free to add to this, as I'm not an expert!