How can Minneapolis not have a White Christmas?

With the way Minnesotans like to gripe about the weather you'd think we would have Minnesotans for Global Warming Clubs. But how can we live in Minneapolis and not have a White Christmas? It looks like that is what might happen. We have a chance of snow around Friday and Saturday, but it is not looking good. An Inconvenient Truth seems to be leading to a brown and grey Christmas.