Ah... But Al Gore can predict what the weather will be like in fifty years. LOL
Yeah...someone told me today that it was going to be hotter here three months from now than it was three months ago!!! Why, we can't even predict the weather in three days...how can we possibly predict the effects of a variation in how the earth's axis is tilted relative to the sun?!?
</sarc>
In other words, even if you can't tell exactly what the weather will be on a specific date several months out, you can still tell general characteristics that will be experienced.