No. There had been several episodes of snow in Norfolk, prior to her going missing. In fact, according to Zach, the night he searched the ball park behind AJ's house, there was snow on the ground.
My opinion is that these Norview shorts (along with the knee brace, 2 sports bras, socks, etc.) found on the side of S Battlefield Blvd in Chesapeake, did belong to AJ, and were the contents of a travel bag she brought home with her from Longwood. We have no official confirmation that these clothes belonged to AJ, but we do know that she went to Norview HS, and that she wore a knee brace, and that (according to WH) one of the bras was identified as one someone had given AJ for Christmas. If these clothing items didn't belong to AJ, then I find it extraordinary that the items of a different young woman, who attended Norview HS, played softball, and wore a knee brace, just happened to end up discarded on the side of the road in rural Chesapeake somehow.
JMO