Which ones did you have before?
My Michelin A4 were still decent in warm weather last year, the other ones I had were Avon IceTouring ST which were just sh!te in warm weather. They had poor tread design and to compensate they made them very soft, as soon as you got to 15 degrees they just smeared all over.
Got Nokian WR A4 now on all four corners now and they easily match the Michelins in performance.