When you think about it, it doesn't matter why. In fact, it doesn't matter that I want it at all. I can't make it snow. It's kind of like wanting your favorite football team to win. It doesn't really matter what you want because you have no control over the outcome.
Instead of focusing on the things you can't change, focus on the things that you can. It's obvious when you're talking about the weather, but what about in your relationships? What things do you have control over? Your attitude. Your actions. Your reactions.
Forget about the things you can't change and focus on the things you can. And if you could, make it snow for me!