When I woke up, we had SNOW!!!

The ground was covered. The trees were white. I was planning on going outside this afternoon, braving the freezing temperatures, to take some pictures. After all, this was first real accumulation we've had all winter. We decided to go the library to return some books before lunch and go to the grocery store. By the time we came back, almost all the snow had melted. Tell me, how does anything melt in 30 degree weather?