From Michelins official web site, not a blog :
http://www.michelinman.com/tire-sele...3/tire-details
"The Pilot Sport A/S 3 is Michelin’s ultimate Ultra High Performance All-Season tire combining summer levels of wet and dry grip with cold weather and light snow mobility"
I'm not stating that these tires are great in snow, but they are not a 3 season tire.