Schnee von gestern - Snow from yesterday
In many places, snow is often hardly recognizable as such the day after it falls. Either warm streets and pedestrians' boots turn it to grey slush, or sun rays and scantily clad adventurers cause it to melt. In German, "Schnee von gestern" describes an argument that is no longer relevant the next day. It's lost its icy punch. This man, in any case, seems to have reconciled with the cold.