What do you mean, "if it's warm"? I'm a Bostonian. Today, it was 40 degrees Farenheit (5 degrees C) and rainy. (And it's not going to get warmer or dryer all week.) Lis and I stopped for ice cream. And we were far from the only people there. Bostonians eat more ice cream when there's two feet of snow on the ground than any other Americans eat during the summer.